WO2016008411A1 - 5-amino-4-carbamoyl-pyrazole compounds as selective and irreversible t790m over wt-egfr kinase inhibitors and use thereof - Google Patents
5-amino-4-carbamoyl-pyrazole compounds as selective and irreversible t790m over wt-egfr kinase inhibitors and use thereof Download PDFInfo
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- WO2016008411A1 WO2016008411A1 PCT/CN2015/084082 CN2015084082W WO2016008411A1 WO 2016008411 A1 WO2016008411 A1 WO 2016008411A1 CN 2015084082 W CN2015084082 W CN 2015084082W WO 2016008411 A1 WO2016008411 A1 WO 2016008411A1
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Definitions
- 5-amino-4-carbamoyl-pyrazole compounds Disclosed herein are 5-amino-4-carbamoyl-pyrazole compounds, pharmaceutical compositions comprising the same, processes for the preparation thereof, and the use thereof in therapy.
- certain 5-amino-4-carbamoyl-pyrazole compounds that have good selectivity of T790M vs WT EGFR inhibition and are useful for treating disorders mediated thereby.
- Lung cancer continues to be the leading cause of cancer-related mortality, demonstrating the limited efficacy of traditional cytotoxic chemotherapy in patients with this disease (Bedano PM, Hanna NH. J Thorac Oncol. 2006; 1: 582–587. ; Jemal A, Siegel R, Ward E, Murray T, Xu J, Smigal C, et al. CA Cancer J Clin. 2006; 56: 106–130. ) .
- targeted therapies may offer well-tolerated disease-modifying treatment options in patient populations defined by relevant oncogene mutation status.
- ERBB receptor tyrosine kinase family including epidermal growth factor receptor (EGFR) , HER2, HER3 and HER4, present an attractive option for targeted therapy in patients with NSCLC, due to observed patterns of oncogenic mutation of EGFR and HER2 (Lynch TJ, Bell DW, Sordella R, Gurubhagavatula S, Okimoto RA, Brannigan BW, et al. N Engl J Med. 2004; 350: 2129–2139. ; Paez JG, Janne PA, Lee JC, Tracy S, Greulich H, Gabriel S, et al. Science. 2004; 304: 1497–1500.
- EGFR epidermal growth factor receptor
- HER2 epidermal growth factor receptor
- EGFR tyrosine kinase inhibitors such as gefitinib and erlotinib
- gefitinib and erlotinib were shown to be effective against lung tumor cells harboring mutations in the kinase domain of EGFR, most commonly small in-frame deletions in exon 19 or the L858R missense mutation in exon 21 (Janne PA, Engelman JA, Johnson BE. J Clin Oncol. 2005; 23: 3227–3234. ) .
- patients almost invariably develop resistance to these inhibitors and relapse after several months (Riely GJ, Pao W, Pham D, Li AR, Rizvi N, Venkatraman ES, et al. Clin Cancer Res. 2006; 12: 839–844. ) .
- TKIs EGFR tyrosine kinase inhibitors
- clinical efficacy is limited by the development of resistance.
- the most common mechanism of resistance is a second site mutation within exon 20 of EGFR (T790M) , observed in ⁇ 50%of cases (Kobayashi S, Ji H, Yuza Y, Meyerson M, Wong KK, Tenen DG, et al. Cancer Res. 2005b; 65: 7096–7101. ; Pao W, Miller VA, Politi KA, Riely GJ, Somwar R, Zakowski MF, et al.
- T790M EGFR exhibits elevated enzymatic and transforming activity, both alone and in combination with primary alterations in exon 19 or 21 (Mulloy R, Ferrand A, Kim Y, Sordella R, Bell DW, Haber DA, et al. Cancer Res. 2007; 67: 2325–2330. ; Schiffer HH, Reding EC, Fuhs SR, Lu Q, Piu F, Wong S, et al. Mol Pharmacol. 2007; 71: 508–518. ; Vikis H, Sato M, James M, Wang D, Wang Y, Wang M, et al. Cancer Res.
- Irreversible inhibitors that covalently modify EGFR exhibit increased efficacy against mutants resistant to gefitinib and erlotinib in cell-based assays (Greulich H, Chen TH, Feng W, Janne PA, Alvarez JV, Zappaterra M, et al. PLoS Med. 2005; 2: e313. ; Yamak EL, Sordella R, Bell DW, Godin-Heymann N, Okimoto RA, Brannigan BW, et al. Proc Natl Acad Sci USA. 2005; 102: 7665–7670. ; Kobayashi S, Boggon TJ, Dayaram T, Janne PA, Kocher O, Meyerson M, et al.
- BIBW2992 or afatinib is a new irreversible dual specificity EGFR/HER2 inhibitor derived from the anilino-quinazoline chemical series that was designed to covalently bind to Cys 773 of EGFR and Cys 805 of HER2.
- NSCLC metastatic non-small cell lung carcinoma
- CO-1686 and AZD9291 are irreversible kinase inhibitors that target the mutant forms of EGFR by inhibiting the common activating mutations (L858R, delE746-A750) and the gatekeeper mutation (T790M) but not the wild-type receptor. Therefore, CO-1686 and AZD9291 have the potential to effectively treat first-and second-line NSCLC patients with EGFR mutations without causing the dose limiting toxicities associated with approved EGFR kinase inhibitors.
- T790M EGFR kinase inhibitors have also been identified.
- the present invention aims to provide new 5-amino-4-carbamoyl-pyrazole compounds which inhibit mutant EGFR kinases.
- At least one 5-amino-4-carbamoyl-pyrazole compounds selected from compounds of Formula (I)
- R 1 , R 2 and R 3 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl;
- R 4 is selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl
- L is a linking group selected from a bond, - (CR 5 R 6 ) n-, S, -O-, and -NR 8 -, wherein n is an integer of 1, 2, or 3;
- W is selected from aryl or heteroaryl, said aryl or heteroaryl is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO 2 , OR 8 , NR'R” , NR'COR” , NR'S O 2 R” , CONR'R” , COOR', SO 2 R', C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl; or
- W and R 4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring optionally containing a further heteroatom selected from NR 8 , O and S, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO 2 , OR 8 , NR'R” , NR'COR” , NR'S O 2 R” , CONR'R” , COOR', SO 2 R', C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl;
- R 7 at each occurrence, is independently selected from hydrogen, halo, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 alkoxy, and C 1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
- Y is selected from -CR 5 R 6 -and -O-;
- Z is selected from - (CR 5 R 6 ) m -, -CR 5 R 6 -O-, -O-, and -NR'-, wherein m is an integer of 1 or 2;
- R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl;
- R 8 is selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl
- R'a nd R at each occurrence, are independently selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl;
- R 1 , R 2 , and R 3 are hydrogen.
- R 4 is hydrogen
- L is a bond
- W is aryl or heteroaryl. In some further embodiments, L is a bond, and W is a phenyl or pyridyl group.
- L is - (CR 5 R 6 ) n -
- W is aryl or heteroaryl, wherein n is an integer of 1, 2, or 3, and R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl.
- L is - (CR 5 R 6 ) n -
- W is a phenyl or pyridyl group, wherein n is an integer of 1, 2, or 3, and R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl.
- L is -CH 2 -
- W is a phenyl or pyridyl group.
- L is a bond or - (CR 5 R 6 ) n -, and W and R 4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring optionally containing a further heteroatom selected from NR 8 , O and S, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO 2 , OR 8 , NR'R” , NR'COR” , NR'S O 2 R” , CONR'R” , COOR', SO 2 R', C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl, wherein R 5 , R 6 , R 8 , R', R” and n are defined as above.
- L is a bond or - (CR 5 R 6 ) n -, and W and R 4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl (such as azetidin-2-yl (i.e., ) and azetidin-3-yl (i.e., ) ) , pyrrolidinyl (such as pyrrolidin-2-yl (i.e., ) , and pyrrolidin-3-yl (i.e., ) ) , piperidinyl (such as piperidin-2-yl (i.e., ) , piperidin-3-yl ( ) , and piperidin-4-yl (i.e., ) ) , and morpholinyl (such as morpholin-2-yl (i.e., ) , and morpholinyl (such
- L is a bond
- W and R 4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl (such as azetidin-2-yl (i.e., ) and azetidin-3-yl (i.e., ) ) , pyrrolidinyl (such as pyrrolidin-2-yl (i.e., ) , and pyrrolidin-3-yl (i.e., ) ) , piperidinyl (such as piperidin-2-yl (i.e., ) , piperidin-3-yl ( ) , and piperidin-4-yl (i.e., ) ) , and morpholinyl (such as morpholin-2-yl (i.e., ) , and morpholin-3-yl (i.e., ) ) , and
- L is -CH 2 -
- W and R 4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl (such as azetidin-2-yl (i.e., ) and azetidin-3-yl (i.e., ) ) , pyrrolidinyl (such as pyrrolidin-2-yl (i.e., ) , and pyrrolidin-3-yl (i.e., ) ) , piperidinyl (such as piperidin-2-yl (i.e., ) , piperidin-3-yl ( ) , and piperidin-4-yl (i.e., ) ) , and morpholinyl (such as morpholin-2-yl (i.e., ) , and morpholin-3-yl (i.e.,
- Y is -O-, and Z is -O-. In some embodiments, Y is -O-, and Z is -NR'-, wherein R'is independently selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl. In some embodiments, Y is -CR 5 R 6 -, and Z is -NR'-, wherein R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl ; and R'is independently selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl.
- Y is -CR 5 R 6 -, and Z is -CR 5 R 6 -, wherein R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl.
- Y is -CR 5 R 6 -, and Z is -O-, wherein R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl.
- Y is -CR 5 R 6 -, Z is - (CR 5 R 6 ) 2 -, wherein R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl.
- Y is -CR 5 R 6 -
- Z is -CR 5 R 6 O -, wherein R 5 and R 6 are independently selected from hydrogen, halo, C 1-6 alkyl, and C 1-6 haloalkyl.
- At least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula (I) , which is Formula (I-1) :
- R 4 is selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl
- L is a linking group selected from a bond, or -CH 2 -;
- W is selected from phenyl or pyridyl
- R 7 at each occurrence, is independently selected from hydrogen, halo, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 alkoxy, and C 1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
- Y is selected from -CH 2 -and -O-;
- Z is selected from -CH 2 -, -CH 2 CH 2 -, -CH 2 O-, -O-, and -NMe-;
- At least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula (I) , which is Formula (I-2) :
- L is a bond or -CH 2 -
- W and R 4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl, pyrrolidinyl, piperidinyl, and morpholinyl, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO 2 , OR 8 , NR'R” , NR'COR” , NR'S O 2 R” , CONR'R” , COOR', SO 2 R', C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl;
- R 7 is independently selected from hydrogen, halo, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 alkoxy, and C 1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4; R 8 is selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl;
- R 8 is selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl
- R'a nd R” at each occurrence, are independently selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl;
- Y is selected from -CH 2 -and -O-;
- Z is selected from -CH 2 -, -CH 2 CH 2 -, -CH 2 O-, -O-, and -NMe-;
- L is a bond or -CH 2 -
- W and R 4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl selected from and pyrrolidinyl selected from and piperidinyl selected from and and morpholinyl selected from and and wherein the wavy lines represent points of attachment to the linking group L, and the acryloyl group on the nitrogen atom is omitted,
- R 7 at each occurrence, is independently selected from hydrogen, halo, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 alkoxy, and C 1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
- Y is selected from -CH 2 -and -O-;
- Z is selected from -CH 2 -, -CH 2 CH 2 -, -CH 2 O-, -O-, and -NMe-;
- At least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula I-2, the carbon atom to which the linking group L is attached to the 4-, or 5-, or 6-membered heterocyclic ring formed by W and R 4 taken together with the nitrogen atom is (R) or (S) configuration.
- At least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula (I) , which is Formula (I-3) :
- R 7 at each occurrence, is independently selected from hydrogen, halo, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 alkoxy, and C 1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
- Y is selected from -CH 2 -and -O-;
- Z is selected from -CH 2 -, -CH 2 CH 2 -, -CH 2 O-, -O-, and -NMe-;
- R 9 is selected fromF, Cl, Br, OR 8 , NR'R” , O- (CH 2 ) n-NR'R” ;
- n 1, 2, 3;
- R 8 is selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl
- R'and R” are independently selected from hydrogen, C 1-6 alkyl, and C 1-6 haloalkyl;
- composition comprising at least one pharmaceutically acceptable carrier and at least one compound selected from compounds of Formula (I) , Formula (I-1) or Formula (I-2) .
- Also provided is a use of at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically accept salts thereof described herein in the manufacture of a medicament for treating cancer including but not limited to ovarian cancer, cervical cancer, colorectal cancer, breast cancer, pancreatic cancer, glioma, glioblastoma, melanoma, prostate cancer, leukaemia, lymphoma, non-Hodgkins lymphoma, gastric cancer, lung cancer including non-small cell lung cancer, hepatocellular cancer, gastric cancer, gastrointestinal stromal tumour (GIST) , thyroid cancer, bile duct cancer, endometrial cancer, renal cancer, anaplastic large cell lymphoma, acute myeloid leukaemia (AML) , multiple myeloma, melanoma and mesothelioma.
- cancer including but not limited to ovarian cancer, cervical cancer, colorectal cancer, breast cancer, pancreatic cancer, glio
- C 1-6 alkyl herein refers to a hydrocarbon group selected from linear and branched saturated hydrocarbon groups comprising from 1 to 6, carbon atoms.
- alkyl group can be selected from methyl, ethyl, 1-propyl or n-propyl ( “n-Pr” ) , 2-propyl or isopropyl ( “i-Pr” ) , 1-butyl or n-butyl ( “n-Bu” ) , 2-methyl-1-propyl or isobutyl ( “i-Bu” ) , 1-methylpropyl or s-butyl ( “s-Bu” ) , and 1, 1-dimethylethyl or t-butyl ( “t-Bu” ) .
- C 2-6 alkynyl refers to a hydrocarbon group selected from linear and branched hydrocarbon group, comprising at least one C ⁇ C triple bond and from 2 to 6, carbon atoms.
- alkynyl group include ethynyl (--C ⁇ CH) , 1-propynyl (-C ⁇ CCH 3 ) , 2-propynyl (propargyl, -CH 2 C ⁇ CH) , 1-butynyl, 2-butynyl, and 3-butynyl groups.
- C 3-8 cycloalkyl refers to a hydrocarbon group selected from saturated and partially unsaturated cyclic hydrocarbon groups, comprising monocyclic and polycyclic (e.g., bicyclic and tricyclic) groups, and comprise from 3 to 8, such as 3 to 6, 3 to 5, or 3 to 4 carbon atoms. Even further for example, the C 3-8 cycloalkyl group may be selected from monocyclic group comprising from 3 to 8, such as 3 to 6 carbon atoms.
- Examples of the monocyclic cycloalkyl group include cyclopropyl, cyclobutyl, cyclopentyl, 1-cyclopent-1-enyl, 1-cyclopent-2-enyl, 1-cyclopent-3-enyl, cyclohexyl, 1-cyclohex-1-enyl, 1-cyclohex-2-enyl, 1-cyclohex-3-enyl, cyclohexadienyl, cycloheptyl, and cyclooctyl.
- Aryl herein refers to a group selected from:
- bicyclic ring systems such as 7 to 12 membered bicyclic ring systems wherein at least one ring is carbocyclic and aromatic, selected, for example, from naphthalene, indane, and 1,2, 3, 4-tetrahydroquinoline; and
- tricyclic ring systems such as 10 to 15 membered tricyclic ring systems wherein at least one ring is carbocyclic and aromatic, for example, fluorene.
- halogen or halo refers to F, Cl, Br or I.
- heteroaryl herein refers to a group selected from:
- 5-to 7-membered aromatic, monocyclic rings comprising at least one heteroatom, for example, from 1 to 4, or, in some embodiments, from 1 to 3, heteroatoms, selected from N, O, and S, with the remaining ring atoms being carbon;
- 8-to 12-membered bicyclic rings comprising at least one heteroatom, for example, from 1 to 4, or, in some embodiments, from 1 to 3, or, in other embodiments, 1 or 2, heteroatoms, selected from N, O, and S, with the remaining ring atoms being carbon and wherein at least one ring is aromatic and at least one heteroatom is present in the aromatic ring; and
- 11-to 14-membered tricyclic rings comprising at least one heteroatom, for example, from 1 to 4, or in some embodiments, from 1 to 3, or, in other embodiments, 1 or 2, heteroatoms, selected from N, O, and S, with the remaining ring atoms being carbon and wherein at least one ring is aromatic and at least one heteroatom is present in an aromatic ring.
- the heteroaryl group includes a 5-to 7-membered heterocyclic aromatic ring fused to a 5-to 7-membered cycloalkyl ring.
- the point of attachment may be at the heteroaromatic ring or at the cycloalkyl ring.
- the total number of S and O atoms in the heteroaryl group exceeds 1, those heteroatoms are not adjacent to one another. In some embodiments, the total number of S and O atoms in the heteroaryl group is not more than 2. In some embodiments, the total number of S and O atoms in the aromatic heterocycle is not more than 1.
- heteroaryl group examples include, but are not limited to, (as numbered from the linkage position assigned priority 1) pyridyl (such as 2-pyridyl, 3-pyridyl, or 4-pyridyl) , cinnolinyl, pyrazinyl, 2, 4-pyrimidinyl, 3, 5-pyrimidinyl, 2, 4-imidazolyl, imidazopyridinyl, isoxazolyl, oxazolyl, thiazolyl, isothiazolyl, thiadiazolyl, tetrazolyl, thienyl, triazinyl, benzothienyl, furyl, benzofuryl, benzoimidazolyl, indolyl, isoindolyl, indolinyl, phthalazinyl, pyrazinyl, pyridazinyl, pyrrolyl, triazolyl, quinolinyl, isoquinolinyl,
- heterocyclic or “heterocycle” or “heterocyclyl” herein refers to a ring selected from4-to 12-membered (such as 4-membered, 5-membered, or 6-membered) monocyclic, bicyclic and tricyclic, saturated and partially unsaturated rings comprising at least one carbon atoms in addition to at least one heteroatom, such as from 1-4 heteroatoms, further such as from 1-3, or further such as 1 or 2 heteroatoms, selected from oxygen, sulfur, and nitrogen.
- heteroatoms such as from 1-4 heteroatoms, further such as from 1-3, or further such as 1 or 2 heteroatoms, selected from oxygen, sulfur, and nitrogen.
- heterocycle examples include, but not limited to, (as numbered from the linkage position assigned priority 1) , 1-azetidinyl, 2-azetidinyl, 3-azetidinyl, 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl, 2, 4-imidazolidinyl, 2, 3-pyrazolidinyl, 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl, 2, 5-piperazinyl, pyranyl, 2-morpholinyl, 3-morpholinyl, oxiranyl, aziridinyl, thiiranyl, azetidinyl, oxetanyl, thietanyl, 1, 2-dithietanyl, 1, 3-dithietanyl, dihydropyridinyl, tetrahydropyridinyl, thiomorpholinyl, thioxanyl, piperazinyl,
- a substituted heterocycle also includes a ring system substituted with one or more oxo moieties, such as piperidinyl N-oxide, morpholinyl-N-oxide, 1-oxo-1-thiomorpholinyl and 1, 1-dioxo-1-thiomorpholinyl.
- oxo moieties such as piperidinyl N-oxide, morpholinyl-N-oxide, 1-oxo-1-thiomorpholinyl and 1, 1-dioxo-1-thiomorpholinyl.
- C 1-6 haloalkyl refers to an C 1-6 alkyl group in which one or more of the hydrogen atoms are replaced by a halogen (e.g., mono-haloalkyl, di-haloalkyl and tri-haloalkyl) .
- a halogen e.g., mono-haloalkyl, di-haloalkyl and tri-haloalkyl
- Such groups include but are not limited to, chloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl and l-chloro-2-fluoromethyl, 2-fluoroisobutyl.
- a C 1-6 haloalkyl may be substituted or unsubstituted.
- C 1-6 alkoxy refers to the formula -OR wherein R is an C 1-6 alkyl.
- R is an C 1-6 alkyl.
- alkoxys are methoxy, ethoxy, n-propoxy, 1-methylethoxy (isopropoxy) , n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy.
- An C 1-6 alkoxy may be substituted or unsubstituted.
- C 1-6 haloalkoxy refers to an C 1-6 alkoxy group in which one or more of the hydrogen atoms are replaced by a halogen (e.g., mono-haloalkoxy, di-haloalkoxy and tri-haloalkoxy) .
- a halogen e.g., mono-haloalkoxy, di-haloalkoxy and tri-haloalkoxy
- Such groups include but are not limited to, chloromethoxy, fluoromethoxy, difluoromethoxy, trifluoromethoxy and l-chloro-2-fluoromethoxy, 2-fluoroisobutoxy.
- a C 1-6 haloalkoxy may be substituted or unsubstituted.
- Compounds described herein may contain an asymmetric center and may thus exist as enantiomers. Where the compounds described herein possess two or more asymmetric centers, they may additionally exist as diastereomers. Enantiomers and diastereomers fall within the broader class of stereoisomers. All such possible stereoisomers as substantially pure resolved enantiomers, racemic mixtures thereof, as well as mixtures of diastereomers are intended to be included. All stereoisomers of the compounds disclosed herein and /or pharmaceutically acceptable salts thereof are intended to be included. Unless specifically mentioned otherwise, reference to one isomer applies to any of the possible isomers. Whenever the isomeric composition is unspecified, all possible isomers are included.
- the term “substantially pure” as used herein means that the target stereoisomer contains no more than 35%, such as no more than 30%, further such as no more than 25%, even further such as no more than 20%, by weight of any other stereoisomer (s) . In some embodiments, the term “substantially pure” means that the target stereoisomer contains no more than 10%, for example, no more than 5%, such as no more than 1%, by weight of any other stereoiosomer (s) .
- reaction products from one another and /or from starting materials.
- the desired products of each step or series of steps is separated and /or purified (hereinafter separated) to the desired degree of homogeneity by the techniques common in the art.
- separations involve multiphase extraction, crystallization from a solvent or solvent mixture, distillation, sublimation, or chromatography.
- Chromatography can involve any number of methods including, for example: reverse-phase and normal phase; size exclusion; ion exchange; high, medium and low pressure liquid chromatography methods and apparatus; small scale analytical; simulated moving bed ( "SMB” ) and preparative thin or thick layer chromatography, as well as techniques of small scale thin layer and flash chromatography.
- SMB simulated moving bed
- Diastereomeric mixtures can be separated into their individual diastereomers on the basis of their physical chemical differences by methods well known to those skilled in the art, such as by chromatography and /or fractional crystallization.
- Enantiomers can be separated by converting the enantiomeric mixture into a diastereomeric mixture by reaction with an appropriate optically active compound (e.g., chiral auxiliary such as a chiral alcohol or Mosher's acid chloride) , separating the diastereomers and converting (e.g., hydrolyzing) the individual diastereoisomers to the corresponding pure enantiomers.
- an appropriate optically active compound e.g., chiral auxiliary such as a chiral alcohol or Mosher's acid chloride
- Enantiomers can also be separated by use of a chiral HPLC column.
- a single stereoisomer e.g., a substantially pure enantiomer
- Racemic mixtures of chiral compounds of the invention can be separated and isolated by any suitable method, including: (1) formation of ionic, diastereomeric salts with chiral compounds and separation by fractional crystallization or other methods, (2) formation of diastereomeric compounds with chiral derivatizing reagents, separation of the diastereomers, and conversion to the pure stereoisomers, and (3) separation of the substantially pure or enriched stereoisomers directly under chiral conditions. See: Wainer, Irving W., Ed. Drug Stereochemistry: Analytical Methods and Pharmacology. New York: Marcel Dekker, Inc., 1993.
- “Pharmaceutically acceptable salts” include, but are not limited to salts with inorganic acids, selected, for example, from hydrochlorates, phosphates, diphosphates, hydrobromates, sulfates, sulfinates, and nitrates; as well as salts with organic acids, selected, for example, from malates, maleates, fumarates, tartrates, succinates, citrates, lactates, methanesulfonates, p-toluenesulfonates, 2-hydroxyethylsulfonates, benzoates, salicylates, stearates, alkanoates such as acetate, and salts with HOOC- (CH 2 ) n -COOH, wherein n is selected from 0 to 4.
- examples of pharmaceutically acceptable cations include, but are not limited to, sodium, potassium, calcium, aluminum, lithium, and ammonium.
- the free base can be obtained by basifying a solution of the acid salt.
- an addition salt such as a pharmaceutically acceptable addition salt, may be produced by dissolving the free base in a suitable organic solvent and treating the solution with an acid, in accordance with conventional procedures for preparing acid addition salts from base compounds.
- salts thereof include salts of at least one compound of Formulae I, and salts of the stereoisomers of at least one compound of Formulae I and II, such as salts of enantiomers, and /or salts of diastereomers.
- Treating, " “treat, “ or “treatment” or “alleviation” refers to administering at least one compound and /or at least one stereoisomer thereof, and /or at least one pharmaceutically acceptable salt thereof disclosed herein to a subject in recognized need thereof that has, for example, cancer.
- an effective amount refers to an amount of at least one compound and /or at least one stereoisomer thereof, and /or at least one pharmaceutically acceptable salt thereof disclosed herein effective to "treat, " as defined above, a disease or disorder in a subject.
- the compounds disclosed herein, and /or the pharmaceutically acceptable salts thereof, can be synthesized from commercially available starting materials taken together with the disclosure herein.
- the following scheme illustrates methods for preparation of some of the compounds disclosed herein.
- Pg protecting group such as t-Boc
- R 7 , p, Y are defined as above.
- a commercially availablestarting material 1 (3, 4-Dihydro-1 (2H) -naphthalenone or 6, 7, 8, 9-tetrahydro-5H-benzo [7] annulen-5-one) is reacted with dimethyl carbonate under basic condition to form formula 2, which is reduced in the presence of acidic condition to give ester 3. Then the ester 3 is hydrolyzed to get the acid 4, which is coupled with malononitrile and reacted with trimethoxymethane to obtain formula 6. Then the ring is closed by using hydrazine hydrate to afford the key pyrazole 7.
- a compound of formula 7 is alkylatedusing protected chiral prolinol, then the cyano group is hydrolyzed under acidic condition to form amide 9.
- the compound of formula 9 is deprotected (for example, the BOC protecting group may be removed by treating with trifluoroacetic acid) .
- the amine 10 is reacted with different warheads to afford a compound of Formula I.
- Also provided herein is a method of treating cancer responsive to inhibition of EGFR kinase comprising administering to a subject, such as a mammal or human, in need of treating for the cancer an effective amount of at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof described herein.
- the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof may be employed alone or in combination with at least one other therapeutic agent for treatment.
- the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof can be used in combination with at least one additional therapeutic agent.
- the at least one additional therapeutics agent can be, for example, selected from anti-hyperproliferative, anti-cancer, and chemotherapeutic agents.
- the at least one compound and /or at least one pharmaceutically acceptable salt disclosed herein may be administered with the at least one other therapeutic agent in a single dosage form or as a separate dosage form.
- the at least one other therapeutic agent When administered as a separate dosage form, the at least one other therapeutic agent may be administered prior to, at the same time as, or following administration of the at least one compound and /or at least one pharmaceutically acceptable salt disclosed herein.
- a "chemotherapeutic agent” is a chemical compound useful in the treatment of cancer, regardless of mechanism of action. Chemotherapeutic agents include compounds used in "targeted therapy” and conventional chemotherapy.
- Suitable chemotherapeutic agents can be, for example, selected from: agents that induce apoptosis; polynucleotides (e.g., ribozymes) ; polypeptides (e.g., enzymes) ; drugs; biological mimetics; alkaloids; alkylating agents; antitumor antibiotics; antimetabolites; hormones; platinum compounds; monoclonal antibodies conjugated with anticancer drugs, toxins, and /or radionuclides; biological response modifiers (e.g., interferons, such as IFN-a and interleukins, such as IL-2) ; adoptive immunotherapy agents; hematopoietic growth factors; agents that induce tumor cell differentiation (e.g., all-trans-retinoic acid) ; gene therapy reagents; antisense therapy reagents and nucleotides; tumor vaccines; and inhibitors of angiogenesis.
- polynucleotides e.g., ribozymes
- chemotherapeutic agents include Erlotinib ( Genentech/OSI Pharm. ) ; Bortezomib ( Millennium Pharm. ) ; Fulvestrant ( AstraZeneca) ; Sunitinib ( Pfizer) ; Letrozole ( Novartis) ; Imatinib mesylate ( Novartis) ; PTK787/ZK 222584 (Novartis) ; Oxaliplatin ( Sanofi) ; 5-FU (5-fluorouracil) ; Leucovorin; Rapamycin (Sirolimus, Wyeth) ;Lapatinib ( GSK572016, Glaxo Smith Kline) ; Lonafarnib (SCH 66336) ; Sorafenib ( Bayer) ; Irinotecan ( Pfizer) and Gefitinib ( AstraZeneca) ; AG1478, AG1571 (SU 5271, Sugen) ; alkylating agents such as
- dynemicin such as dynemicin A
- bisphosphonates such as clodronate
- an esperamicin as well as neocarzinostatin chromophore and related chromoprotein enediyne antibiotic chromophores, aclacinomysins, actinomycin, authramycin, azaserine, bleomycins, cactinomycin, carabicin, caminomycin, carzinophilin, chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, (doxorubicin) , morpholino-doxorubicin, cyanomorpholino-doxorubicin, 2-pyrrolino-doxorubicin and deoxydoxorubicin) , epirubicin,
- paclitaxel American Pharmaceutical Partners, Schaumberg, Ill. ) , and (doxetaxel; Rhone-Poulenc Rorer, Antony, France) ; chloranmbucil; (gemcitabine) ; 6-thioguanine; mercaptopurine; methotrexate; platinum analogs such as cisplatin and carboplatin; vinblastine; etoposide (VP-16) ; ifosfamide; mitoxantrone; vincristine; (vinorelbine) ; novantrone; teniposide; edatrexate; daunomycin; aminopterin; capecitabine ib and ronate; CPT-11; topoisomerase inhibitor RFS 2000; difluoromethylornithine (DMFO) ; retinoids such as retinoic acid; and pharmaceutically acceptable
- the "chemotherapeutic agent” can also be selected, for example, from: (i) anti-hormonal agents that act to regulate or inhibit hormone action on tumors such as anti-estrogens and selective estrogen receptor modulators (SERMs) , including, for example, tamoxifen (including tamoxifen citrate) , raloxifene, droloxifene, 4-hydroxytamoxifen, trioxifene, keoxifene, LY117018, onapristone, and (toremifine citrate) ; (ii) aromatase inhibitors that inhibit the enzyme aromatase, which regulates estrogen production in the adrenal gl and s, such as, for example, 4 (5) -imidazoles, aminoglutethimide, (megestrol acetate) , (exemestane; Pfizer) , formestanie, fadrozole, (vorozole) , (letrozole; Novartis)
- the "chemotherapeutic agent” can also be selected, for example, from therapeutic antibodies such as alemtuzumab (Campath) , bevacizumab ( Genentech) ; cetuximab ( Imclone) ; panitumumab ( Amgen) , rituximab ( Genentech/Biogen Idec) , pertuzumab ( 2C4, Genentech) , trastuzumab ( Genentech) , tositumomab (Bexxar, Corixia) , and the antibody drug conjugate, gemtuzumab ozogamicin ( Wyeth) .
- therapeutic antibodies such as alemtuzumab (Campath) , bevacizumab ( Genentech) ; cetuximab ( Imclone) ; panitumumab ( Amgen) , rituximab ( Genentech/Biogen Idec) , pertuzumab ( 2C4,
- Humanized monoclonal antibodies with therapeutic potential as chemotherapeutic agents in combination with the at least one compound selected from compounds of Formula (I) (such as Formulae (II) ) , stereoisomers thereof, and pharmaceutically acceptable salt thereof may, for example, be selected from: alemtuzumab, apolizumab, aselizumab, atlizumab, bapineuzumab, bevacizumab, bivatuzumab mertansine, cantuzumab mertansine, cedelizumab, certolizumab pegol, cidfusituzumab, cidtuzumab, daclizumab, eculizumab, efalizumab, epratuzumab, erlizumab, felvizumab, fontolizumab, gemtuzumab ozogamicin, inotuzumab ozogamicin, ipilimumab, labet
- composition comprising at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof, and at least one pharmaceutically acceptable carrier.
- compositions comprising at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof can be administered in various known manners, such as orally, topically, rectally, parenterally, by inhalation spray, or via an implanted reservoir, although the most suitable route in any given case will depend on the particular host, and nature and severity of the conditions for which the active ingredient is being administered.
- parenteral as used herein includes subcutaneous, intracutaneous, intravenous, intramuscular, intraarticular, intraarterial, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques.
- the compositionsdisclosed herein may be conveniently presented in unit dosage form and prepared by any of the methods well known in the art.
- the at least one compound selected from Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof can be administered orally in solid dosage forms, such as capsules, tablets, troches, dragées, granules and powders, or in liquid dosage forms, such as elixirs, syrups, emulsions, dispersions, and suspensions.
- the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein can also be administered parenterally, in sterile liquid dosage forms, such as dispersions, suspensions or solutions.
- dosages forms that can also be used to administer the at least one compound selected from Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein as an ointment, cream, drops, transdermal patch or powder for topical administration, as an ophthalmic solution or suspension formation, i.e., eye drops, for ocular administration, as an aerosol spray or powder composition for inhalation or intranasal administration, or as a cream, ointment, spray or suppository for rectal or vaginal administration.
- Formula (I) stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein as an ointment, cream, drops, transdermal patch or powder for topical administration, as an ophthalmic solution or suspension formation, i.e., eye drops, for ocular administration, as an aerosol spray or powder composition for inhalation or intranasal administration, or as a cream, ointment, spray or suppository for rectal or vaginal administration.
- powdered carriers such as lactose, starch, cellulose derivatives, magnesium stearate, stearic acid, and the like.
- Similar diluents can be used to make compressed tablets. Both tablets and capsules can be manufactured as sustained release products to provide for continuous release of medication over a period of time. Compressed tablets can be sugar coated or film coated to mask any unpleasant taste and protect the tablet from the atmosphere, or enteric coated
- Liquid dosage forms for oral administration can further comprise at least one agent selected from coloring and flavoring agents to increase patient acceptance.
- parenteral solutions can be examples of suitable carriers for parenteral solutions.
- Solutions for parenteral administration maycomprise a water soluble salt of the at least one compound describe herein, at least one suitable stabilizing agent, and if necessary, at least one buffer substance.
- Antioxidizing agents such as sodium bisulfite, sodium sulfite, or ascorbic acid, either alone or combined, can be examples of suitable stabilizing agents.
- Citric acid and its salts and sodium EDTA can also be used as examples of suitable stabilizing agents.
- parenteral solutions can further comprise at least one preservative, selected, for example, from benzalkonium chloride, methyl-and propylparaben, and chlorobutanol.
- a pharmaceutically acceptable carrier is, for example, selected from carriers that are compatible with active ingredients of the composition (and in some embodiments, capable of stabilizing the active ingredients) and not deleterious to the subject to be treated.
- solubilizing agents such as cyclodextrins (which can form specific, more soluble complexes with the at least one compound and /or at least one pharmaceutically acceptable salt disclosed herein)
- examples of other carriers include colloidal silicon dioxide, magnesium stearate, cellulose, sodium lauryl sulfate, and pigments such as D&C Yellow #10. Suitable pharmaceutically acceptable carriers are described in Remington's Pharmaceutical Sciences, A. Osol, a standard reference text in the art.
- the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein can further be examined for efficacy in treating cancer by in vivo assays.
- the at least one compound and /or the at least one pharmaceutically acceptable salts thereof disclosed herein can be administered to an animal (e.g., a mouse model) having cancer and its therapeutic effects can be accessed. Positive results in one or more of such tests are sufficient to increase the scientific storehouse of knowledge and hence sufficient to demonstrate practical utility of the compounds and /or salts tested. Based on the results, an appropriate dosage range and administration route for animals, such as humans, can also be determined.
- the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein may be conveniently delivered in the form of an aerosol spray presentation from pressurized packs or nebulisers.
- the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein may also be delivered as powders, which may be formulated and the powder composition may be inhaled with the aid of an insufflation powder inhaler device.
- One exemplary delivery system for inhalation can be a metered dose inhalation (MDI) aerosol, which may be formulated as a suspension or solution of at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein in at least one suitable propellant, selected, for example, from fluorocarbons and hydrocarbons.
- MDI metered dose inhalation
- an ophthalmic preparation may be formulated with an appropriate weight percentage of a solution or suspension of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein in an appropriate ophthalmic vehicle, such that the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and at least one pharmaceutically acceptable salts thereof disclosed herein is maintained in contact with the ocular surface for a sufficient time period to allow the compound to penetrate the corneal and internal regions of the eye.
- Useful pharmaceutical dosage-forms for administration of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein include, but are not limited to, hard and soft gelatin capsules, tablets, parenteral injectables, and oral suspensions.
- the dosage administered will be dependent on factors, such as the age, health and weight of the recipient, the extent of disease, type of concurrent treatment, if any, frequency of treatment, and the nature of the effect desired.
- a daily dosage of the active ingredient can vary, for example, from 0.1 to 2000 milligrams per day. For example, 10-500 milligrams once or multiple times per day may be effective to obtain the desired results.
- a large number of unit capsules can be prepared by filling standard two-piece hard gelatin capsules each with, for example, 100 milligrams of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salt thereof disclosed herein in powder, 150 milligrams of lactose, 50 milligrams of cellulose, and 6 milligrams magnesium stearate.
- a mixture of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof a digestible oil such as soybean oil, cottonseed oil or olive oil can be prepared and injected by means of a positive displacement pump into gelatin to form soft gelatin capsules containing 100 milligrams of the active ingredient. The capsules are washed and dried.
- a large number of tablets can be prepared by conventional procedures so that the dosage unit comprises, for example, 100 milligrams of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof, 0.2 milligrams of colloidal silicon dioxide, 5 milligrams of magnesium stearate, 275 milligrams of microcrystalline cellulose, 11 milligrams of starch and 98.8 milligrams of lactose.
- Appropriate coatings may be applied to increase palatability or delay absorption.
- a parenteral composition suitable for administration by injection can be prepared by stirring 1.5%by weight of the at least one compound and /or at least an enantiomer, a diastereomer, or pharmaceutically acceptable salt thereof disclosed herein in 10%by volume propylene glycol. The solution is made to the expected volume with water for injection and sterilized.
- an aqueous suspension can be prepared for oral administration.
- each 5 milliliters of an aqueous suspension comprising 100 milligrams of finely divided at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof, 100 milligrams of sodium carboxymethyl cellulose, 5 milligrams of sodium benzoate, 1.0 grams of sorbitol solution, U.S.P., and 0.025 milliliters of vanillin can be used.
- the same dosage forms can generally be used when the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof are administered stepwise or in conjunction with at least one other therapeutic agent.
- the dosage form and administration route should be selected depending on the compatibility of the combined drugs.
- coadministration is understood to include the administration of at least two agents concomitantly or sequentially, or alternatively as a fixed dose combination of the at least two active components.
- the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salt thereof disclosed herein can be administered as the sole active ingredient or in combination with at least one second active ingredient, selected, for example, from other active ingredients known to be useful for treating cancers in a patient.
- reaction flasks were fitted with rubber septa for the introduction of substrates and reagents via syringe; and glassware was oven dried and /or heat dried.
- column chromatography purification was conducted on a Biotage system (Manufacturer: Dyax Corporation) having a silica gel column or on a silica SepPak cartridge (Waters) , or was conducted on a Teledyne Isco Combiflash purification system using prepacked silica gel cartridges.
- 1 H NMR spectra were recorded on a Varian instrument operating at 400 MHz. 1 H-NMR spectra were obtained using CDCl 3 , CD 2 Cl 2 , CD 3 OD, D 2 O, d 6 -DMSO, d 6 -acetone or (CD 3 ) 2 CO as solvent and tetramethylsilane (0.00 ppm) or residual solvent (CDCl 3 : 7.25 ppm; CD 3 OD: 3.31 ppm; D 2 O: 4.79 ppm; d 6 -DMSO: 2.50 ppm; d 6 -acetone: 2.05; (CD 3 ) 2 CO: 2.05) as the reference standard.
- EA layer was washed with water (500 ml x3) , brine (500 ml x2) , dried over Na 2 SO 4 , concentrated to remove about 800 ml EA. PE (1.5 L) was added and stirred overnight, the white solid was collected and dried in air to give the desired product (228 g) .
- Step A 2- ( (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) (hydroxy) methylene) malononitrile
- Step B 2- ( (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) (methoxy) methylene) malononitrile
- Step C 5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carbonitrile
- Step D (3R) -tert-butyl 3- (5-amino-4-cyano-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step E (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin -2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step F 5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
- Step G 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
- step F A mixture of the product of step F (310 mg, 0.90 mmol) and NaHCO 3 (454 mg, 5.40 mmol) in CH 3 CN/H 2 O (7 mL/7 mL) was stirred at 0 °C for 5 min.
- Acryloyl chloride (81 mg, 0.90 mmol) was added dropwise at 0 °C. The final solution was stirred at 0 °C for 5 min and quenched by water, then extracted with EA (10 mL x 3) .
- Compound 1.2 was prepared according to the procedures described for Compound 1.1 under appropriate conditions that could be recognized by one skilled in the art.
- Step B ethyl 6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxine-2-carboxylate
- Step C 6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxine-2-carboxylic acid
- Step D 2- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxine-2-carbonyl) malononitrile
- Step E 2- ( (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) (methoxy) methylene) malononitrile
- Step F 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
- Step G 5-amino-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
- step F A mixture of the product of step F (300 mg, 0.964 mmol) in MsOH (3 mL) was stirred at 70°C for 2 hours.
- the combined organic layers were washed with brine, dried over Na 2 SO 4 , concentrated invacuo to give target compound (307 mg, 96.8%) as a white solid.
- Step H (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step I 5-amino-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1- ( (S) -pyrrolidin-2-ylmethyl) -1H-pyrazole-4-carboxamide
- Step J 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
- Compound 1.4 was prepared according to the procedures described for Compound 1.3 under appropriate conditions that could be recognized by one skilled in the art.
- Step B ethyl 3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
- Step C ethyl 4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
- Step D 4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylic acid
- Step E 2- (hydroxy (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) methylene) malononitrile
- step D To a solution of the product of step D (17.20 g, 89.02 mmol) in DCM (50 mL) was added HOBT (14.42 g, 106.83 mmol) , Et3N (25.69 mL, 178.04 mmol) followed by EDCI (20.48 g, 106.83 mmol) . The solution was stirred at rt for 30 min. The malononitrile (7.06 g, 106.83 mmol) was added. The final solution was stirred at rt for 2-3 hrs.
- Step F 2- (methoxy (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) methylene) malononitrile
- Step G 5-amino-3- (4-methyl-3, 4- d ihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carbonitrile
- Step H (3R) -tert-butyl 3- (5-amino-4-cyano-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- step G A mixture of the product of step G (581 mg, 2.28 mmol) , (S) -Tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (BL-1, 970 mg, 2.73 mmol) and Cs 2 CO 3 (1.49 g, 4.56 mmol) in DMF (10 mL) was stirred at 70 °C for 24 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (10 mL x 3) .
- Step I (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step J 5-amino-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
- Step K 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
- step J A mixture of the product of step J (238 mg, 0.67 mmol) and NaHCO 3 (337 mg, 4.02 mmol) in CH 3 CN/H 2 O (5 mL/5 mL) was stirred at 0 °C for 5 min.
- Acryloyl chloride 60 mg, 0.67 mmol was added drop wise at 0 °C. The final solution was stirred at 0 °C for 5 min and quenched by water, then extracted with EA (10 mL x 3) .
- Step A ethyl 6-fluoro-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
- Step B ethyl 6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
- Step C 6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylic acid
- Step D 2- ( (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (hydroxy) methylene) malononitrile
- Step E 2- ( (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (methoxy) methylene) malononitrile
- Step F 5-amino-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carbonitrile
- Step G (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step H (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step I 5-amino-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1- ( (S) -pyrrolidin-2-ylmethyl) -1H-pyrazole-4-carboxamide
- Step J 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
- step I To a mixture of the product of step I (100 mg, 0.267 mmol) in CH 3 CN (4 mL) was added saturated NaHCO 3 aqueous solution (1 mL) . The resulting solution was cooled to 0 °C and a solution of acryloyl chloride (24 mg, 0.267 mmol) in CH 3 CN (1 mL) was added dropwise. The final solution was stirred at 0 °C for 5 min and quenched by water, then extracted with EA (30 mL x 2) .
- Step C ethyl 6, 7-difluoro-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
- Step D ethyl 6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
- Step E 6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylic acid
- Step F 2- ( (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (hydroxy) methylene) malononitrile
- step E To a solution of the product of step E (2.6 g, 11.35 mmol) in DCM (40 mL) was added HOBT (1.83 g, 13.6 mmol) , Et 3 N (2.3 g, 22.7 mmol) followed by EDCI (2.6 g, 13.6 mmol) . The solution was stirred at rt for 30 min. The malononitrile (0.74 g, 11.35mmol) was added. The final solution was stirred at rt for 3 hrs. The resulting solution was concentrated, the residue was diluted in EA (100 mL) , washed by saturated NaHCO 3 aqueous solution followed by saturated NH 4 Cl aqueous solution.
- Step G 2- ( (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (methoxy) methylene) malononitrile
- Step H 5-amino-3- (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carbonitrile
- Step I (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (6, 7-difluoro-4-methyl-3, 4-dihydro -2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step J (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step K 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
- step H To the solution of the product of step H (230 mg, 0.274 mmol) in DCM (5 mL) was added TFA (1 mL) . The solution was stirred at rt for 4 hrs. The resulting solution was concentrated to dryness and the residue was dissolved in CH 3 CN (5 mL) . After cooling to 0 °C, saturated NaHCO 3 aqueous solution (2 mL) was added. Then a solution of acryloyl chloride (24 mg, 0.267 mmol) in CH 3 CN (1 mL) was added drop wise. The final solution was stirred at 0 °C for 30 min and quenched by water, then extracted with EA (40 mL) .
- Step A ethyl quinoline-3-carboxylate
- Step B ethyl 1-methyl-1, 2, 3, 4-tetrahydroquinoline-3-carboxylate
- Step C 1-methyl-1, 2, 3, 4-tetrahydroquinoline-3-carboxylic acid
- Step D 2- (hydroxy (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) methylene) malononitrile
- Step E 2- (methoxy (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) methylene) malononitrile
- Step F 5-amino-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) -1H-pyrazole-4-carbo nitrile
- Step G (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3 -yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step H (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1-methyl-1, 2, 3, 4-tetrahydro quinolin-3-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- step G To a solution of the product of step G (200 mg, 0.46 mmol) in EtOH (3 mL) was added DMSO (0.5 mL) , 5N NaOH aqueous solution (0.5 mL) followed by H 2 O 2 (0.5 mL) . The solution was stirred at 60 °C for 2 hours. The resulting solution was concentrated under reduced pressure. The residue was diluted with water (5 mL) and extracted with EA (10 mL x 2) . The combined organic phase was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography eluting with EA 100%to obtain the desired product (190 mg, 91%) as a yellow solid.
- Step I 5-amino-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) -1- ( (S) -pyrrolidin-2-yl methyl) -1H-pyrazole-4-carboxamide
- Step J 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) -1H-pyrazole-4-carboxamide
- Step A methyl 6-fluoro-1-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
- Step B methyl 6-fluoro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
- Step C 6-fluoro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
- Step D 2- ( (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (hydroxy) methylene) malononitrile
- Step E 2- ( (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (methoxy) methylene) malononitrile
- Step F 5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
- step E A solution of the product of step E (2.2 g, 8.6 mmol) and hydrazine hydrate (2 mL) in EtOH (10 mL) was stirred at rt for 10 min. The resulting solution was concentrated. The residue was diluted with EA (100 mL) , washed by brine (50 mL) , dried over anhydrous sodium sulfate then concentrated to get crude product (2.0 g, 91%) as a yellow solid, which was used in next step directly.
- Step G (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step H (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidi n e- 1 -carboxylate
- step G To a solution of the product of step G (1.02 g, 2.3 mmol) in EtOH (20 mL) and DMSO (1 mL) was added 5N NaOH aqueous solution (1 mL) , followed by H 2 O 2 (1 mL) at rt. The mixture was stirred at 50 °C for 30 min.
- Step I 5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1- ( (S) -pyrrolidin-2-ylmethyl) -1H-pyrazole-4-carboxamide
- Step J 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fl u oro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- step I To a mixture of the product of step I (880 mg, crude) and NaHCO 3 (400 mg, 4.76 mmol) in MeCN/H 2 O (10 mL/10 mL) was added dropwise a solution of acryloyl chl o ride (160 mg, 1.78 mmol) in MeCN (1 mL) at rt and the mixture was stirred for 1 h. The resulting mixture was extracted with EA (10 mL x 3) .
- Step A (R or S) (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step B (R or S) 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C (R or S) 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step B To a mixture of the product of Step B (1 g, crude, 2.2 mmol) and NaHCO 3 (739 mg, 8.8 mmol) in MeCN/H 2 O (25 mL/25 mL) was added dropwise a solution of acryloyl chloride (200 mg, 2.2 mmol) in MeCN (2 mL) at 0°C and the mixture was stirred at 0°C for 10 min.
- Step A (3R) -tert-butyl 3- (5-amino-4-cyano-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step B (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen -2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step C 5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
- Step D 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A methyl 1-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
- Step B methyl 1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
- Step C 1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
- Step D 2- (hydroxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
- Step E 2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
- Step F 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
- Step G (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step H (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step I 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- (1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazole-4-carboxamide
- Step J 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- step I A mixture of the product of step I (196 mg, 0.58 mmol) and NaHCO 3 (291 mg, 3.47 mmol) in CH 3 CN/H 2 O (5 mL/5 mL) was stirred at 0 °C for 5 min.
- Acryloyl chloride 51 mg, 0.58 mmol was added dropwise at 0 °C. The final solution was stirred at 0 °C for 5 min and quenched by water, then extracted with EA (10 mL x 3) .
- Step A (R or S) (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step B (R or S) 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C (R or S) 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A (R) -4-benzyl-3- (3-phenylpropanoyl) oxazolidin-2-one
- Step B (S) -tert-butyl 3-benzyl-4- ( (R) -4-benzyl-2-oxooxazolidin-3-yl) -4-oxobutanoate
- Step C (S) -3-benzyl-4- ( (R) -4-benzyl-2-oxooxazolidin-3-yl) -4-oxobutanoic acid
- Step D (S) -2-benzylsuccinic acid
- Step E (S) -4-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
- step D A mixture of the product of step D (7 g, 33.6 mmol) in conc. H 2 SO 4 (20 mL) was stirred at 60°C for 20 min. The reaction mixture was poured into ice-H 2 O (150 mL) and extracted with EtOAc (50 mL x 3) . The combined organic layers were washed with brined, dried over Na 2 SO 4 and concentrated to give the target compound (6.3 g, 100%) as a white solid, which was directly used to the next step.
- Step F (R) -1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
- step E The product of step E (6.3 g, 33.6 mmol) was dissolved in AcOH (40 mL) , HClO 4 (0.5 mL) and Pd/C (500 mg) were added. Then the reaction mixture was stirred overnight under H 2 (1 atm) . The reaction mixture was filtered and the filtrate was concentrated to give the residue, which was stirred with H 2 O (50 mL) for half an hour and filtered. The cake was collected, dried to give target compound (3 g, 50.7%) as a white solid. MS: M/e 177 (M +1) +
- Step G (R) -2- (hydroxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
- step F To a solution of the product of step F (3 g, 17 mmol) in CH 2 Cl 2 (30 mL) was added HOBT (2.7 g, 20.4 mmol) and Et 3 N (4.4 g, 34 mmol) followed by EDCI (3.9 g, 20.4 mmol) . After stirred for 20 min, malononitrile (1.12 g, 17 mmol) was added. Then the reaction mixture was stirred for 2 hours. The mixture was washed with H 2 O (30 mL) , brine, dried over Na 2 SO 4 and concentrated to give the residue, which was dissolved in EtOAc (50 mL) and washed with aq. H 2 SO 4 (4 M, 40 mL) , brine, dried over Na 2 SO 4 and concentrated to give target compound (3.8 g, 99.7%) as a tan solid. MS: M/e 225 (M+1) +
- Step H (R) -2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
- Step I (R) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
- Step J (R) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step K (S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
- Step L 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step M 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- step L To a stirred solution of the product of step L (0.102 mmol) in CH 3 CN/H 2 O (3 mL/3 mL) was added NaHCO 3 (17.1 mg, 0.204 mmol) , then a solution of acryloyl chloride (9.28 mg, 0.102 mmol) in CH 3 CN (1 mL) was added dropwise at 0°C. The reaction mixture was extracted with EtOAc (5 mL x 3) . The combined organic layers were washed with brine, dried over Na 2 SO 4 , concentrated and purified by Prep-HPLC to give target compound (12 mg, 29.7 %) in the form of TFA salt.
- Step A (3R) -tert-butyl 3- (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step B (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step C 5-amino-1- ( (R) -piperidin-3-yl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step D 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A (R or S) (3R) -tert-butyl3- (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step B (R or S) (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step C (R or S) 5-amino-1- ( (R) -piperidin-3-yl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step D (R or S) 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A Ethyl 4-oxochroman-3-carboxylate and ethyl 4-hydroxy-2H-chromene-3-carboxylate
- Step D 5-Amino-3- (chroman-3-yl) -1H-pyrazole-4-carbonitrile
- Step F 5-Amino-3- (chroman-3-yl) -1- (2-nitrobenzyl) -1H-pyrazole-4-carboxamide
- Step G 5-amino-1- (2-aminobenzyl) -3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
- Step H 1- (2-acrylamidobenzyl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
- Step A (3R) -tert-Butyl 3- (5-amino-4-carbamoyl-3- (chroman-3-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
- Step B 5-Amino-3- (chroman-3-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
- Step C 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
- Step A 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step B 5-amino-1- (2-nitrobenzyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C 5-amino-1- (2-aminobenzyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step D 1- (2-acrylamidobenzyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Compound 1.20 was separated into two enantiomeric stereoisomers compound 1.20a (peak 1, R or S, earlier peak, retention time at 6.59 min in chiral analysis) , and compound 1.20b (peak 2, S or R, later peak, retention time at 10.46 min in chiral analysis) by chiral prep-HPLC.
- Step A 5-Amino-1- (3-nitrophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
- Step B 5-Amino-1- (3-nitrophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C 5-amino-1- (3-aminophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step D 1- (3-acrylamidophenyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step B (R) -tert-butyl 2- ( (tosyloxy) methyl) morpholine-4-carboxylate
- Step C (2R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) morpholine-4-carboxylate
- Step D 5-amino-1- ( (R) -morpholin-2-ylmethyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step E 1- ( ( (R) -4-acryloylmorpholin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- step D A mixture of the product of step D (171 mg, 0.48 mmol) and NaHCO 3 (242 mg, 32.88 mmol) in CH 3 CN/H 2 O (4 mL/4 mL) was stirred at 0 °C for 5 min.
- Acryloyl chloride 43 mg, 0.48 mmol was added dropwise at 0 °C. The final solution was stirred at 0 °C for 5 min and quenched by water, then extracted with EA (10 mL x 3) .
- Compound 1.32 was prepared according to the procedures described for Compound 1.19 under appropriate conditions that could be recognized by one skilled in the art.
- Compound 1.33 was prepared according to the procedures described for Compound 1.10 under appropriate conditions that could be recognized by one skilled in the art.
- Compound 1.33 was separated into two enantiomeric stereoisomers compound 1.33a (peak 1, R or S, earlier peak, retention time at 4.68 min in chiral analysis) , and compound 1.33b (peak 2, S or R, later peak, retention time at 5.30 min in chiral analysis) by chiral prep-HPLC.
- Step A 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A (S) -1-tert-butyl 2-methyl 4, 4-difluoropyrrolidine-1, 2-dicarboxylate
- Step B (S) -tert-butyl 4, 4-difluoro-2- (hydroxymethyl) pyrrolidine-1-carboxylate
- Step C (S) -tert-butyl 4, 4-difluoro-2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate
- Step D (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) -4, 4-difluoropyrrolidine-1-carboxylate
- Step E 5-amino-1- ( ( (S) -4, 4-difluoropyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step F 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- step E A mixture of the product of step E (326 mg, 0.86 mmol) and NaHCO 3 (289 mg, 3.44 mmol) in CH 3 CN/H 2 O (8 mL/8 mL) was stirred at 0 °C for 5 min.
- Acryloyl chloride (78 mg, 0.86 mmol) in CH 3 CN (1 mL) was added dropwise at 0 °C. The final solution was stirred at 0 °C for 5 min and quenched by water, then extracted with EA (20 mL x 3) .
- Step A (R or S) (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphth alen-2-yl) -1H-pyrazol-1-yl) methyl) -4, 4-difluoropyrrolidine-1-carboxylate
- Step B (R or S) 5-amino-1- ( ( (S) -4, 4-difluoropyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C (R or S) 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3-(1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Peak 1 (Compound 1.42a, retention time: 5.391 min) : 1 H NMR (400 MHz,DMSO-d 6 ) ⁇ 7.18–6.96 (m, 4H) , 6.58–6.27 (m, 3H) , 6.26–6.07 (m, 1H) , 5.97 (s, 2H) , 5.82–5.46 (m, 1H) , 4.73–4.44 (m, 1H) , 4.22–3.96 (m, 3H) , 3.90–3.64 (m, 1H) , 3.47–3.25 (m, 1H) , 3.00–2.73 (m, 4H) , 2.68–2.54 (m, 1H) , 2.45–2.35 (m, 1H) , 2.19–2.01 (m, 1H) , 1.86–1.67 (m, 1H) ppm.
- Step A (S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) methyl) -4, 4-difluoropyrrolidine-1-carboxylate
- Step B 5-amino-1- ( ( (S) -4, 4-difluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A (2S, 4R) -1-tert-butyl 2-methyl 4-fluoropyrrolidine-1, 2-dicarboxylate
- Step B (2S, 4R) -tert-butyl 4-fluoro-2- (hydroxymethyl) pyrrolidine-1-carboxylate
- Step C (2S, 4R) -tert-butyl 4-fluoro-2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate
- Step D (2S, 4R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) methyl) -4-fluoropyrrolidine-1-carboxylate
- Step E 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step F 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- step E A mixture of the product of step E (410 mg, 1.15 mmol) and NaHCO 3 (386 mg, 4.6 mmol) in CH 3 CN/H 2 O (10 mL/10 mL) was stirred at 0 °C for 5 min.
- Acryloyl chloride 103 mg, 1.15 mmol was added drop wise at 0 °C. The final solution was stirred at 0 °C for 5 min and quenched by water, then extracted with EA (20 mL x 3) .
- Step A (R or S) (2S, 4R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) -4-fluoropyrrolidine-1-carboxylate
- Step B (R or S) 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C (R or S) 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3-( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Peak 1 (Compound 1.43a, retention time: 5.456 min) : 1 H NMR (400 MHz, DMSO-d 6 ) ⁇ 7.22 –6.94 (m, 4H) , 6.64–6.44 (m, 1H) , 6.36 (s, 2H) , 6.22–6.06 (m, 1H) , 5.91 (s, 2H) , 5.79–5.44 (m, 1H) , 5.35–4.90 (m, 1H) , 4.64–4.31 (m, 1H) , 4.20–3.71 (m, 3H) , 3.54–3.26 (m, 2H) , 3.02–2.67 (m, 4H) , 2.34–1.97 (m, 3H) , 1.89–1.69 (m, 1H) ppm.
- Step A (2S, 4R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- ( (R) -1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) -4-fluoropyrrolidine-1-carboxylate
- Step B 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step C 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1,2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
- Step A 1- (tert-butyl) 2-methyl (2S, 4R) -4-fluoropyrrolidine-1, 2-dicarboxylate
- Step B tert-butyl (2S, 4R) -4-fluoro-2- (hydroxymethyl) pyrrolidine-1-carboxylate
- Step C tert-butyl (2S, 4R) -4-fluoro-2-formylpyrrolidine-1-carboxylate
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Abstract
Disclosed are compounds of Formula (I), pharmaceutical compositions comprising the same, processes for the preparation thereof, and the use thereof.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of PCT application No. PCT/CN2014/082439 filed on July 18, 2014, the disclosure of which is incorporated herein by reference in its entirety.
1.FIELD OF THE INVENTION
Disclosed herein are 5-amino-4-carbamoyl-pyrazole compounds, pharmaceutical compositions comprising the same, processes for the preparation thereof, and the use thereof in therapy. Disclosed herein are certain 5-amino-4-carbamoyl-pyrazole compounds that have good selectivity of T790M vs WT EGFR inhibition and are useful for treating disorders mediated thereby.
2.DESCRIPTION OF RELATED ART
Lung cancer continues to be the leading cause of cancer-related mortality, demonstrating the limited efficacy of traditional cytotoxic chemotherapy in patients with this disease (Bedano PM, Hanna NH. J Thorac Oncol. 2006; 1: 582–587. ; Jemal A, Siegel R, Ward E, Murray T, Xu J, Smigal C, et al. CA Cancer J Clin. 2006; 56: 106–130. ) . The development of new and effective therapies for patients with advanced lung cancer remains a major health imperative, and targeted therapies may offer well-tolerated disease-modifying treatment options in patient populations defined by relevant oncogene mutation status. Members of the ERBB receptor tyrosine kinase family, including epidermal growth factor receptor (EGFR) , HER2, HER3 and HER4, present an attractive option for targeted therapy in patients with NSCLC, due to observed patterns of oncogenic mutation of EGFR and HER2 (Lynch TJ, Bell DW, Sordella R,
Gurubhagavatula S, Okimoto RA, Brannigan BW, et al. N Engl J Med. 2004; 350: 2129–2139. ; Paez JG, Janne PA, Lee JC, Tracy S, Greulich H, Gabriel S, et al. Science. 2004; 304: 1497–1500. ; Pao W, Miller V, Zakowski M, Doherty J, Politi K, Sarkaria I, et al. Proc Natl Acad Sci USA. 2004; 101: 13306–13311. ; Stephens P, Hunter C, Bignell G, Edkins S, Davies H, Teague J, et al. Nature. 2004; 431: 525–526. ; Shigematsu H, Takahashi T, Nomura M, Majmudar K, Suzuki M, Lee H, et al. Cancer Res. 2005; 65: 1642–1646. ; Shimamura T, Ji H, Minami Y, Thomas RK, Lowell AM, Shah K, et al. Cancer Res. 2006; 66: 6487–6491. ; Wang SE, Narasanna A, Perez-Torres M, Xiang B, Wu FY, Yang S, et al. Cancer Cell. 2006; 10: 25–38. ) .
First-generation small molecule EGFR tyrosine kinase inhibitors, such as gefitinib and erlotinib, were shown to be effective against lung tumor cells harboring mutations in the kinase domain of EGFR, most commonly small in-frame deletions in exon 19 or the L858R missense mutation in exon 21 (Janne PA, Engelman JA, Johnson BE. J Clin Oncol. 2005; 23: 3227–3234. ) . However, despite the initial response, patients almost invariably develop resistance to these inhibitors and relapse after several months (Riely GJ, Pao W, Pham D, Li AR, Rizvi N, Venkatraman ES, et al. Clin Cancer Res. 2006; 12: 839–844. ) .
Non-small cell lung cancer (NSCLC) patients with activating EGFR mutations initially respond well to the EGFR tyrosine kinase inhibitors (TKIs) erlotinib and gefitinib. However, clinical efficacy is limited by the development of resistance. The most common mechanism of resistance is a second site mutation within exon 20 of EGFR (T790M) , observed in ~50%of cases (Kobayashi S, Ji H, Yuza Y, Meyerson M, Wong KK, Tenen DG, et al. Cancer Res. 2005b; 65: 7096–7101. ; Pao W, Miller VA, Politi KA, Riely GJ, Somwar R, Zakowski MF, et al. PLoS Med. 2005a; 2: e73. ) . T790M EGFR exhibits elevated enzymatic and transforming activity, both alone and in combination with primary alterations in exon 19 or 21 (Mulloy R, Ferrand A, Kim Y, Sordella R, Bell DW, Haber DA, et al. Cancer Res. 2007; 67: 2325–2330. ; Schiffer HH, Reding EC, Fuhs SR, Lu Q, Piu F, Wong S, et al. Mol Pharmacol. 2007; 71: 508–518. ; Vikis H, Sato M, James M, Wang D, Wang Y, Wang M, et al. Cancer Res. 2007; 67: 4665–4670; Yuza Y, Glatt KA, Jiang J, Greulich H, Minami Y, Woo MS, et
al. Cancer Biol Ther. 2007; 6: 661–667. ) , indicating a need for increased therapeutic efficacy of the next generation of EGFR inhibitors.
Irreversible inhibitors that covalently modify EGFR exhibit increased efficacy against mutants resistant to gefitinib and erlotinib in cell-based assays (Greulich H, Chen TH, Feng W, Janne PA, Alvarez JV, Zappaterra M, et al. PLoS Med. 2005; 2: e313. ; Kwak EL, Sordella R, Bell DW, Godin-Heymann N, Okimoto RA, Brannigan BW, et al. Proc Natl Acad Sci USA. 2005; 102: 7665–7670. ; Kobayashi S, Boggon TJ, Dayaram T, Janne PA, Kocher O, Meyerson M, et al. N Engl J Med. 2005a; 352: 786–792. ; Kobayashi S, Ji H, Yuza Y, Meyerson M, Wong KK, Tenen DG, et al. Cancer Res. 2005b; 65: 7096–7101; Shimamura T, Ji H, Minami Y, Thomas RK, Lowell AM, Shah K, et al. Cancer Res. 2006; 66: 6487–6491. ; Yuza Y, Glatt KA, Jiang J, Greulich H, Minami Y, Woo MS, et al. Cancer Biol Ther. 2007; 6: 661–667. ) . Preclinical and early clinical trials also suggest a potential efficacy of a new class of panHER inhibitor in overcome acquired resistance related to T790M. One such inhibitor, BIBW2992 or afatinib, is a new irreversible dual specificity EGFR/HER2 inhibitor derived from the anilino-quinazoline chemical series that was designed to covalently bind to Cys 773 of EGFR and Cys 805 of HER2. Athough afatinib demonstrated clinical benefits and was recently approved for the treatment of metastatic non-small cell lung carcinoma (NSCLC) . However, indirect comparison of phase III trials showed higher incidences of diarrhea, skin rash and stomatitis for afatinib respect to erlotinib or gefitinib (Mok TS, Wu YL, Thongprasert S, et al. N Engl J Med 2009; 361: 947-57; Rosell R, Carcereny E, Gervais R, et al. Lancet Oncol 2012; 13: 239-46; Han JY, Park K, Kim SW, et al. J Clin Oncol 2012; 30: 1122-8. ) . Taken into account, all these data suggested that toxicities of the second-generation covalent inhibitors are probably higher than those observed with first-generation compounds. Wild type EGFR inhibition is believed to drive the observed dose limiting toxicities (such as skin rash and diarrhea) for these first and second generation therapies in the clinic.
To further improve the efficacy and overcome the side effect of the second generation of EGFR inhibitors such as afatinib, dacomitinib and neratinib, the third generation of irreversible EGFR inhibitors have been reported and moved into clinical trials. These new type of EGFR
inhibitors have good selectivity of T790M vs WT EGFR inhibition. For examples, CO-1686 and AZD9291are irreversible kinase inhibitors that target the mutant forms of EGFR by inhibiting the common activating mutations (L858R, delE746-A750) and the gatekeeper mutation (T790M) but not the wild-type receptor. Therefore, CO-1686 and AZD9291 have the potential to effectively treat first-and second-line NSCLC patients with EGFR mutations without causing the dose limiting toxicities associated with approved EGFR kinase inhibitors.
Certain other T790M EGFR kinase inhibitors have also been identified. International Patent Application Publication WO 2011/162515, International Patent Application Publication WO 2013/184757, International Patent Application Publication WO 2013/184766, International Patent Application Publication WO 2013/014448, International Patent Application Publication WO 2013/042006, International Patent Application Publication WO 2013/118817, International Patent Application Publication WO 2013/125709, International Patent Application Publication WO 2014/025486.
BRIEF SUMMARY OF THE INVENTION
The present invention aims to provide new 5-amino-4-carbamoyl-pyrazole compounds which inhibit mutant EGFR kinases.
Disclosed herein are 5-amino-4-carbamoyl-pyrazole compounds that can selectively inhibit T790M EGFR kinases over WT-EGFR kinases.
Provided is at least one 5-amino-4-carbamoyl-pyrazole compounds selected from compounds of Formula (I)
stereoisomers thereof, and pharmaceutically acceptable salts thereof,
wherein:
R1, R2 and R3 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl;
R4 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
L is a linking group selected from a bond, - (CR5R6) n-, S, -O-, and -NR8-, wherein n is an integer of 1, 2, or 3;
W is selected from aryl or heteroaryl, said aryl or heteroaryl is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R” , NR'COR” , NR'S O2R” , CONR'R” , COOR', SO2R', C1-6alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl; or
W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring optionally containing a further heteroatom selected from NR8, O and S, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R” , NR'COR” , NR'S O2R” , CONR'R” , COOR', SO2R', C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl;
R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
Y is selected from -CR5R6-and -O-;
Z is selected from - (CR5R6) m-, -CR5R6-O-, -O-, and -NR'-, wherein m is an integer of 1 or 2;
R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl;
R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
R'a nd R” , at each occurrence, are independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl; and
*is a chiral center.
In some embodiments, R1, R2, and R3 are hydrogen.
In some embodiments, R4 is hydrogen.
In some embodiments, L is a bond, and W is aryl or heteroaryl. In some further embodiments, L is a bond, and W is a phenyl or pyridyl group.
In some embodiments, L is - (CR5R6) n-, and W is aryl or heteroaryl, wherein n is an integer of 1, 2, or 3, and R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl. In some further embodiments, L is - (CR5R6) n-, and W is a phenyl or pyridyl group, wherein n is an integer of 1, 2, or 3, and R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl. In some further embodiments, L is -CH2-, and W is a phenyl or pyridyl group.
In some embodiments, L is a bond or - (CR5R6) n-, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring optionally containing a further heteroatom selected from NR8, O and S, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R” , NR'COR” , NR'S O2R” , CONR'R” , COOR', SO2R', C1-6alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl, wherein R5, R6, R8, R', R” and n are defined as above. In some further embodiments, L is a bond or - (CR5R6) n-, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl (such as azetidin-2-yl (i.e., ) and azetidin-3-yl (i.e., ) ) , pyrrolidinyl (such as pyrrolidin-2-yl (i.e., ) , and pyrrolidin-3-yl (i.e., ) ) , piperidinyl (such as piperidin-2-yl (i.e., ) , piperidin-3-yl () , and piperidin-4-yl (i.e., ) ) , and morpholinyl (such as morpholin-2-yl (i.e., ) , and morpholin-3-yl (i.e., ) ) , and wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyll; and n is an integer of 1, 2, or 3, and wherein the wavy lines represent points of attachment to the linking group L, and the acryloyl group on the nitrogen atom is omitted. In some further embodiments, L is a bond, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl (such as azetidin-2-yl (i.e., ) and
azetidin-3-yl (i.e., ) ) , pyrrolidinyl (such as pyrrolidin-2-yl (i.e., ) , and pyrrolidin-3-yl (i.e., ) ) , piperidinyl (such as piperidin-2-yl (i.e., ) , piperidin-3-yl () , and piperidin-4-yl (i.e., ) ) , and morpholinyl (such as morpholin-2-yl (i.e., ) , and morpholin-3-yl (i.e., ) ) , and wherein the wavy lines represent points of attachment to the linking group L, and the acryloyl group on the nitrogen atom is omitted. In some further embodiments, L is -CH2-, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl (such as azetidin-2-yl (i.e., ) and azetidin-3-yl (i.e., ) ) , pyrrolidinyl (such as pyrrolidin-2-yl (i.e., ) , and pyrrolidin-3-yl (i.e., ) ) , piperidinyl (such as piperidin-2-yl (i.e., ) , piperidin-3-yl () , and piperidin-4-yl (i.e., ) ) , and morpholinyl (such as morpholin-2-yl (i.e., ) , and morpholin-3-yl (i.e., ) ) , and wherein the wavy lines represent points of attachment to the linking group L, and the acryloyl group on the nitrogen atom is omitted.
In some embodiments, Y is -O-, and Z is -O-. In some embodiments, Y is -O-, and Z is -NR'-, wherein R'is independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl. In some embodiments, Y is -CR5R6-, and Z is -NR'-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl ; and R'is independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl. In some embodiments, Y is -CR5R6-, and Z is -CR5R6-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl. In some embodiments, Y is -CR5R6-, and Z is -O-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl. In some embodiments, Y is -CR5R6-, Z is - (CR5R6) 2-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and
C1-6 haloalkyl. In some embodiments, Y is -CR5R6-, and Z is -CR5R6O-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl.
Provided is at least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula (I) , which is Formula (I-1) :
stereoisomers thereof, and pharmaceutically acceptable salts thereof,
wherein:
R4 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
L is a linking group selected from a bond, or -CH2 -;
W is selected from phenyl or pyridyl; or
R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
Y is selected from -CH2-and -O-;
Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and
*is a chiral center.
Provided is at least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula (I) , which is Formula (I-2) :
stereoisomers thereof, and pharmaceutically acceptable salts thereof,
wherein:
L is a bond or -CH2-,
W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl, pyrrolidinyl, piperidinyl, and morpholinyl, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R” , NR'COR” , NR'S O2R” , CONR'R” , COOR', SO2R', C1-6alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl;
R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4; R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
R'a nd R” , at each occurrence, are independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
Y is selected from -CH2-and -O-;
Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and
*is a chiral center.
In some embodiments, at least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula I-2, wherein
L is a bond or -CH2-,
W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl selected from andpyrrolidinyl selected fromandpiperidinyl selected from andand morpholinyl selected fromandand wherein the wavy lines represent points of attachment to the linking group L, and the acryloyl group on the nitrogen atom is omitted,
R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
Y is selected from -CH2-and -O-;
Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and
*is a chiral center.
In some embodiments, at least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula I-2, the carbon atom to which the linking group L is attached to the 4-, or 5-, or 6-membered heterocyclic ring formed by W and R4 taken together with the nitrogen atom is (R) or (S) configuration.
Provided is at least one 5-amino-4-carbamoyl-pyrazole compounds according to Formula (I) , which is Formula (I-3) :
stereoisomers thereof, and pharmaceutically acceptable salts thereof,
wherein:
R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;
Y is selected from -CH2-and -O-;
Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and
*is a chiral center.
R9 is selected fromF, Cl, Br, OR8, NR'R” , O- (CH2) n-NR'R” ;
n=1, 2, 3;
R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
R'and R” , at each occurrence, are independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
Also provided herein is at least one compound selected from the following compounds:
stereoisomers thereof, and pharmaceutically accept salts thereof described herein.
Also provided herein is at least one compound selected from the following compounds showing the following stereochemistry:
Also provided is a pharmaceutical composition comprising at least one pharmaceutically acceptable carrier and at least one compound selected from compounds of Formula (I) , Formula (I-1) or Formula (I-2) .
Also provided is a use of at least one compound selected from compounds of Formula (I) , Formula (I-1) or Formula (I-2) , stereoisomers thereof, and pharmaceutically accept salts thereof described herein in manufacture of a medicament for inhibiting EGFR-T790M kinase.
Also provided is a use of at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically accept salts thereof described herein in the manufacture of a medicament for treating cancer, including but not limited to ovarian cancer, cervical cancer, colorectal cancer, breast cancer, pancreatic cancer, glioma, glioblastoma, melanoma, prostate cancer, leukaemia, lymphoma, non-Hodgkins lymphoma, gastric cancer, lung cancer including non-small cell lung cancer, hepatocellular cancer, gastric cancer, gastrointestinal stromal tumour (GIST) , thyroid cancer, bile duct cancer, endometrial cancer, renal cancer, anaplastic large cell lymphoma, acute myeloid leukaemia (AML) , multiple myeloma, melanoma and mesothelioma.
As used herein, the following words, phrases and symbols are generally intended to have the meanings as set forth below, except to the extent that the context in which they are used indicates otherwise. The following abbreviations and terms have the indicated meanings throughout:
The term "C1-6alkyl" herein refers to a hydrocarbon group selected from linear and branched saturated hydrocarbon groups comprising from 1 to 6, carbon atoms. Examples of the alkyl group can be selected from methyl, ethyl, 1-propyl or n-propyl ( "n-Pr" ) , 2-propyl or isopropyl ( "i-Pr" ) , 1-butyl or n-butyl ( "n-Bu" ) , 2-methyl-1-propyl or isobutyl ( "i-Bu" ) , 1-methylpropyl or s-butyl ( "s-Bu" ) , and 1, 1-dimethylethyl or t-butyl ( "t-Bu" ) .
The term "C2-6alkenyl" herein refers to a hydrocarbon group selected from linear and branched hydrocarbon groups comprising at least one C=C double bond and from 2 to 6, carbon
atoms. Examples of the alkenyl group may be selected from ethenyl or vinyl (--CH=CH2) , prop-1-enyl (--CH=CHCH3) , prop-2-enyl (--CH2CH=CH2) , 2-methylprop-1-enyl, but-1-enyl, but-2-enyl, but-3-enyl, buta-1, 3-dienyl, 2-methylbuta-1, 3-diene, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl, and hexa-1, 3-dienyl groups.
The term "C2-6 alkynyl" herein refers to a hydrocarbon group selected from linear and branched hydrocarbon group, comprising at least one C≡C triple bond and from 2 to 6, carbon atoms. Examples of the alkynyl group include ethynyl (--C≡CH) , 1-propynyl (-C≡CCH3) , 2-propynyl (propargyl, -CH2C≡CH) , 1-butynyl, 2-butynyl, and 3-butynyl groups.
The term "C3-8cycloalkyl" herein refers to a hydrocarbon group selected from saturated and partially unsaturated cyclic hydrocarbon groups, comprising monocyclic and polycyclic (e.g., bicyclic and tricyclic) groups, and comprise from 3 to 8, such as 3 to 6, 3 to 5, or 3 to 4 carbon atoms. Even further for example, the C3-8cycloalkyl group may be selected from monocyclic group comprising from 3 to 8, such as 3 to 6 carbon atoms. Examples of the monocyclic cycloalkyl group include cyclopropyl, cyclobutyl, cyclopentyl, 1-cyclopent-1-enyl, 1-cyclopent-2-enyl, 1-cyclopent-3-enyl, cyclohexyl, 1-cyclohex-1-enyl, 1-cyclohex-2-enyl, 1-cyclohex-3-enyl, cyclohexadienyl, cycloheptyl, and cyclooctyl.
The term "Aryl" herein refers to a group selected from:
5-and 6-membered carbocyclic aromatic rings, for example, phenyl;
bicyclic ring systems such as 7 to 12 membered bicyclic ring systems wherein at least one ring is carbocyclic and aromatic, selected, for example, from naphthalene, indane, and 1,2, 3, 4-tetrahydroquinoline; and
tricyclic ring systems such as 10 to 15 membered tricyclic ring systems wherein at least one ring is carbocyclic and aromatic, for example, fluorene.
The term "halogen" or "halo" herein refers to F, Cl, Br or I.
The term "heteroaryl" herein refers to a group selected from:
5-to 7-membered aromatic, monocyclic rings comprising at least one heteroatom, for example, from 1 to 4, or, in some embodiments, from 1 to 3, heteroatoms, selected from N, O, and S, with the remaining ring atoms being carbon;
8-to 12-membered bicyclic rings comprising at least one heteroatom, for example, from 1 to 4, or, in some embodiments, from 1 to 3, or, in other embodiments, 1 or 2, heteroatoms, selected from N, O, and S, with the remaining ring atoms being carbon and wherein at least one ring is aromatic and at least one heteroatom is present in the aromatic ring; and
11-to 14-membered tricyclic rings comprising at least one heteroatom, for example, from 1 to 4, or in some embodiments, from 1 to 3, or, in other embodiments, 1 or 2, heteroatoms, selected from N, O, and S, with the remaining ring atoms being carbon and wherein at least one ring is aromatic and at least one heteroatom is present in an aromatic ring.
For example, the heteroaryl group includes a 5-to 7-membered heterocyclic aromatic ring fused to a 5-to 7-membered cycloalkyl ring. For such fused, bicyclic heteroaryl ring systems wherein only one of the rings comprises at least one heteroatom, the point of attachment may be at the heteroaromatic ring or at the cycloalkyl ring.
When the total number of S and O atoms in the heteroaryl group exceeds 1, those heteroatoms are not adjacent to one another. In some embodiments, the total number of S and O atoms in the heteroaryl group is not more than 2. In some embodiments, the total number of S and O atoms in the aromatic heterocycle is not more than 1.
Examples of the heteroaryl group include, but are not limited to, (as numbered from the linkage position assigned priority 1) pyridyl (such as 2-pyridyl, 3-pyridyl, or 4-pyridyl) , cinnolinyl, pyrazinyl, 2, 4-pyrimidinyl, 3, 5-pyrimidinyl, 2, 4-imidazolyl, imidazopyridinyl, isoxazolyl, oxazolyl, thiazolyl, isothiazolyl, thiadiazolyl, tetrazolyl, thienyl, triazinyl, benzothienyl, furyl, benzofuryl, benzoimidazolyl, indolyl, isoindolyl, indolinyl, phthalazinyl, pyrazinyl, pyridazinyl, pyrrolyl, triazolyl, quinolinyl, isoquinolinyl, pyrazolyl, pyrrolopyridinyl (such as 1H-pyrrolo [2, 3-b] pyridin-5-yl) , pyrazolopyridinyl (such as 1H-pyrazolo [3, 4-b] pyridin-5-yl) , benzoxazolyl (such as benzo [d] oxazol-6-yl) , pteridinyl, purinyl, 1-oxa-2, 3-diazolyl, 1-oxa-2, 4-diazolyl, 1-oxa-2, 5-diazolyl, 1-oxa-3, 4-diazolyl, 1-thia-2, 3-diazolyl, 1-thia-2, 4-diazolyl, 1-thia-2, 5-diazolyl, 1-thia-3, 4-diazolyl, furazanyl, benzofurazanyl, benzothiophenyl, benzothiazolyl, benzoxazolyl, quinazolinyl, quinoxalinyl,
naphthyridinyl, furopyridinyl, benzothiazolyl (such as benzo [d] thiazol-6-yl) , indazolyl (such as 1H-indazol-5-yl) and 5, 6, 7, 8-tetrahydroisoquinoline.
The term "heterocyclic" or "heterocycle" or "heterocyclyl" herein refers to a ring selected from4-to 12-membered (such as 4-membered, 5-membered, or 6-membered) monocyclic, bicyclic and tricyclic, saturated and partially unsaturated rings comprising at least one carbon atoms in addition to at least one heteroatom, such as from 1-4 heteroatoms, further such as from 1-3, or further such as 1 or 2 heteroatoms, selected from oxygen, sulfur, and nitrogen.
Examples of the heterocycle include, but not limited to, (as numbered from the linkage position assigned priority 1) , 1-azetidinyl, 2-azetidinyl, 3-azetidinyl, 1-pyrrolidinyl, 2-pyrrolidinyl, 3-pyrrolidinyl, 2, 4-imidazolidinyl, 2, 3-pyrazolidinyl, 1-piperidinyl, 2-piperidinyl, 3-piperidinyl, 4-piperidinyl, 2, 5-piperazinyl, pyranyl, 2-morpholinyl, 3-morpholinyl, oxiranyl, aziridinyl, thiiranyl, azetidinyl, oxetanyl, thietanyl, 1, 2-dithietanyl, 1, 3-dithietanyl, dihydropyridinyl, tetrahydropyridinyl, thiomorpholinyl, thioxanyl, piperazinyl, homopiperazinyl, homopiperidinyl, azepanyl, oxepanyl, thiepanyl, 1, 4-oxathianyl, 1, 4-dioxepanyl, 1, 4-oxathiepanyl, 1, 4-oxaazepanyl, 1, 4-dithiepanyl, 1, 4-thiazepanyl and 1, 4-diazepane 1, 4-dithianyl, 1, 4-azathianyl, oxazepinyl, diazepinyl, thiazepinyl, dihydrothienyl, dihydropyranyl, dihydrofuranyl, tetrahydrofuranyl, tetrahydrothienyl, tetrahydropyranyl, tetrahydrothiopyranyl, 1-pyrrolinyl, 2-pyrrolinyl, 3-pyrrolinyl, indolinyl, 2H-pyranyl, 4H-pyranyl, 1, 4-dioxanyl, 1, 3-dioxolanyl, pyrazolinyl, pyrazolidinyl, dithianyl, dithiolanyl, pyrazolidinyl, imidazolinyl, pyrimidinonyl, 1, 1-dioxo-thiomorpholinyl, 3-azabicyco [3.1.0] hexanyl, 3-azabicyclo [4.1.0] heptanyl and azabicyclo [2.2.2] hexanyl. A substituted heterocycle also includes a ring system substituted with one or more oxo moieties, such as piperidinyl N-oxide, morpholinyl-N-oxide, 1-oxo-1-thiomorpholinyl and 1, 1-dioxo-1-thiomorpholinyl.
As used herein, "C1-6haloalkyl" refers to an C1-6alkyl group in which one or more of the hydrogen atoms are replaced by a halogen (e.g., mono-haloalkyl, di-haloalkyl and tri-haloalkyl) . Such groups include but are not limited to, chloromethyl, fluoromethyl, difluoromethyl, trifluoromethyl and l-chloro-2-fluoromethyl, 2-fluoroisobutyl. A C1-6haloalkyl may be substituted or unsubstituted.
As used herein, "C1-6alkoxy" refers to the formula -OR wherein R is an C1-6alkyl. A non-limiting list of alkoxys are methoxy, ethoxy, n-propoxy, 1-methylethoxy (isopropoxy) , n-butoxy, iso-butoxy, sec-butoxy and tert-butoxy. An C1-6alkoxy may be substituted or unsubstituted.
As used herein, "C1-6haloalkoxy" refers to an C1-6alkoxy group in which one or more of the hydrogen atoms are replaced by a halogen (e.g., mono-haloalkoxy, di-haloalkoxy and tri-haloalkoxy) . Such groups include but are not limited to, chloromethoxy, fluoromethoxy, difluoromethoxy, trifluoromethoxy and l-chloro-2-fluoromethoxy, 2-fluoroisobutoxy. A C1-6haloalkoxy may be substituted or unsubstituted.
Compounds described herein may contain an asymmetric center and may thus exist as enantiomers. Where the compounds described herein possess two or more asymmetric centers, they may additionally exist as diastereomers. Enantiomers and diastereomers fall within the broader class of stereoisomers. All such possible stereoisomers as substantially pure resolved enantiomers, racemic mixtures thereof, as well as mixtures of diastereomers are intended to be included. All stereoisomers of the compounds disclosed herein and /or pharmaceutically acceptable salts thereof are intended to be included. Unless specifically mentioned otherwise, reference to one isomer applies to any of the possible isomers. Whenever the isomeric composition is unspecified, all possible isomers are included.
The term "substantially pure" as used herein means that the target stereoisomer contains no more than 35%, such as no more than 30%, further such as no more than 25%, even further such as no more than 20%, by weight of any other stereoisomer (s) . In some embodiments, the term "substantially pure" means that the target stereoisomer contains no more than 10%, for example, no more than 5%, such as no more than 1%, by weight of any other stereoiosomer (s) .
It may be advantageous to separate reaction products from one another and /or from starting materials. The desired products of each step or series of steps is separated and /or purified (hereinafter separated) to the desired degree of homogeneity by the techniques common in the art. Typically such separations involve multiphase extraction, crystallization from a solvent or solvent mixture, distillation, sublimation, or chromatography. Chromatography can involve any number of methods including, for example: reverse-phase and normal phase; size exclusion; ion exchange;
high, medium and low pressure liquid chromatography methods and apparatus; small scale analytical; simulated moving bed ( "SMB" ) and preparative thin or thick layer chromatography, as well as techniques of small scale thin layer and flash chromatography. One skilled in the art will apply techniques most likely to achieve the desired separation.
Diastereomeric mixtures can be separated into their individual diastereomers on the basis of their physical chemical differences by methods well known to those skilled in the art, such as by chromatography and /or fractional crystallization. Enantiomers can be separated by converting the enantiomeric mixture into a diastereomeric mixture by reaction with an appropriate optically active compound (e.g., chiral auxiliary such as a chiral alcohol or Mosher's acid chloride) , separating the diastereomers and converting (e.g., hydrolyzing) the individual diastereoisomers to the corresponding pure enantiomers. Enantiomers can also be separated by use of a chiral HPLC column.
A single stereoisomer, e.g., a substantially pure enantiomer, may be obtained by resolution of the racemic mixture using a method such as formation of diastereomers using optically active resolving agents (Eliel, E. and Wilen, S. Stereochemistry of Organic Compounds. New York: John Wiley &Sons, Inc., 1994; Lochmuller, C.H., et al. "Chromatographic resolution of enantiomers: Selective review. " J. Chromatogr., 113 (3) (1975) : pp. 283-302) . Racemic mixtures of chiral compounds of the invention can be separated and isolated by any suitable method, including: (1) formation of ionic, diastereomeric salts with chiral compounds and separation by fractional crystallization or other methods, (2) formation of diastereomeric compounds with chiral derivatizing reagents, separation of the diastereomers, and conversion to the pure stereoisomers, and (3) separation of the substantially pure or enriched stereoisomers directly under chiral conditions. See: Wainer, Irving W., Ed. Drug Stereochemistry: Analytical Methods and Pharmacology. New York: Marcel Dekker, Inc., 1993.
"Pharmaceutically acceptable salts" include, but are not limited to salts with inorganic acids, selected, for example, from hydrochlorates, phosphates, diphosphates, hydrobromates, sulfates, sulfinates, and nitrates; as well as salts with organic acids, selected, for example, from malates, maleates, fumarates, tartrates, succinates, citrates, lactates, methanesulfonates,
p-toluenesulfonates, 2-hydroxyethylsulfonates, benzoates, salicylates, stearates, alkanoates such as acetate, and salts with HOOC- (CH2) n-COOH, wherein n is selected from 0 to 4. Similarly, examples of pharmaceutically acceptable cations include, but are not limited to, sodium, potassium, calcium, aluminum, lithium, and ammonium.
In addition, if a compound disclosed herein is obtained as an acid addition salt, the free base can be obtained by basifying a solution of the acid salt. Conversely, if the product is a free base, an addition salt, such as a pharmaceutically acceptable addition salt, may be produced by dissolving the free base in a suitable organic solvent and treating the solution with an acid, in accordance with conventional procedures for preparing acid addition salts from base compounds. Those skilled in the art will recognize various synthetic methodologies that may be used without undue experimentation to prepare non-toxic pharmaceutically acceptable addition salts.
As defined herein, "pharmaceutically acceptable salts thereof" include salts of at least one compound of Formulae I, and salts of the stereoisomers of at least one compound of Formulae I and II, such as salts of enantiomers, and /or salts of diastereomers.
"Treating, " "treat, " or "treatment" or "alleviation" refers to administering at least one compound and /or at least one stereoisomer thereof, and /or at least one pharmaceutically acceptable salt thereof disclosed herein to a subject in recognized need thereof that has, for example, cancer.
The term "effective amount" refers to an amount of at least one compound and /or at least one stereoisomer thereof, and /or at least one pharmaceutically acceptable salt thereof disclosed herein effective to "treat, " as defined above, a disease or disorder in a subject.
The compounds disclosed herein, and /or the pharmaceutically acceptable salts thereof, can be synthesized from commercially available starting materials taken together with the disclosure herein. The following scheme illustrates methods for preparation of some of the compounds disclosed herein.
Scheme I
R=different wareheads
Pg=protecting group such as t-Boc
R7, p, Y are defined as above.
In this scheme, a commercially availablestarting material 1 (3, 4-Dihydro-1 (2H) -naphthalenone or 6, 7, 8, 9-tetrahydro-5H-benzo [7] annulen-5-one) is reacted with dimethyl carbonate under basic condition to form formula 2, which is reduced in the presence of acidic condition to give ester 3. Then the ester 3 is hydrolyzed to get the acid 4, which is coupled with malononitrile and reacted with trimethoxymethane to obtain formula 6. Then the ring is closed by using hydrazine hydrate to afford the key pyrazole 7. A compound of formula 7 is alkylatedusing protected chiral prolinol, then the cyano group is hydrolyzed under acidic condition to form amide 9. The compound of formula 9 is deprotected (for example, the BOC protecting group may be
removed by treating with trifluoroacetic acid) . The amine 10 is reacted with different warheads to afford a compound of Formula I.
Also provided herein is a method of treating cancer responsive to inhibition of EGFR kinase comprising administering to a subject, such as a mammal or human, in need of treating for the cancer an effective amount of at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof described herein.
The at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof may be employed alone or in combination with at least one other therapeutic agent for treatment. In some embodiments, the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof can be used in combination with at least one additional therapeutic agent. The at least one additional therapeutics agent can be, for example, selected from anti-hyperproliferative, anti-cancer, and chemotherapeutic agents. The at least one compound and /or at least one pharmaceutically acceptable salt disclosed herein may be administered with the at least one other therapeutic agent in a single dosage form or as a separate dosage form. When administered as a separate dosage form, the at least one other therapeutic agent may be administered prior to, at the same time as, or following administration of the at least one compound and /or at least one pharmaceutically acceptable salt disclosed herein. A "chemotherapeutic agent" is a chemical compound useful in the treatment of cancer, regardless of mechanism of action. Chemotherapeutic agents include compounds used in "targeted therapy" and conventional chemotherapy. Suitable chemotherapeutic agents can be, for example, selected from: agents that induce apoptosis; polynucleotides (e.g., ribozymes) ; polypeptides (e.g., enzymes) ; drugs; biological mimetics; alkaloids; alkylating agents; antitumor antibiotics; antimetabolites; hormones; platinum compounds; monoclonal antibodies conjugated with anticancer drugs, toxins, and /or radionuclides; biological response modifiers (e.g., interferons, such as IFN-a and interleukins, such as IL-2) ; adoptive immunotherapy agents; hematopoietic growth factors; agents that induce tumor cell differentiation (e.g., all-trans-retinoic acid) ; gene therapy reagents; antisense therapy reagents and nucleotides; tumor vaccines; and inhibitors of angiogenesis.
Examples of chemotherapeutic agents include Erlotinib (Genentech/OSI Pharm. ) ; Bortezomib (Millennium Pharm. ) ; Fulvestrant (AstraZeneca) ; Sunitinib (Pfizer) ; Letrozole (Novartis) ; Imatinib mesylate (Novartis) ; PTK787/ZK 222584 (Novartis) ; Oxaliplatin (Sanofi) ; 5-FU (5-fluorouracil) ; Leucovorin; Rapamycin (Sirolimus,Wyeth) ;Lapatinib (GSK572016, Glaxo Smith Kline) ; Lonafarnib (SCH 66336) ; Sorafenib (Bayer) ; Irinotecan (Pfizer) and Gefitinib (AstraZeneca) ; AG1478, AG1571 (SU 5271, Sugen) ; alkylating agents such as thiotepa and cyclosphosphamide; alkyl sulfonates such as busulfan, improsulfan and piposulfan; aziridines such as benzodopa, carboquone, meturedopa, and uredopa; ethylenimines and methylamelamines such as altretamine, triethylenemelamine, triethylenephosphoramide, triethylenethiophosphoramide and trimethylomelamine; acetogenins (such as bullatacin and bullatacinone) ; a camptothecin (such as the synthetic analog topotecan) ; bryostatin; callystatin; CC-1065 and its adozelesin, carzelesin and bizelesin synthetic analogs; cryptophycins (such as cryptophycin 1 and cryptophycin 8) ; dolastatin; duocarmycin and the synthetic analogs thereof, such as KW-2189 and CB1-TM1; eleutherobin; pancratistatin; a sarcodictyin; spongistatin; nitrogen mustards such as chlorambucil, chlomaphazine, chlorophosphamide, estramustine, ifosfamide, mechlorethamine, mechlorethamine oxide hydrochloride, melphalan, novembichin, phenesterine, prednimustine, trofosfamide, uracil mustard; nitrosureas such as carmustine, chlorozotocin, fotemustine, lomustine, nimustine, and ranimnustine; antibiotics such as the enediyne antibiotics (e.g., calicheamicin, such as calicheamicin gamma1I and calicheamicin omegaI1 (Angew Chem. Intl. Ed. Engl. (1994) 33: 183-186) ; dynemicin, such as dynemicin A; bisphosphonates, such as clodronate; an esperamicin; as well as neocarzinostatin chromophore and related chromoprotein enediyne antibiotic chromophores, aclacinomysins, actinomycin, authramycin, azaserine, bleomycins, cactinomycin, carabicin, caminomycin, carzinophilin, chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, (doxorubicin) , morpholino-doxorubicin, cyanomorpholino-doxorubicin, 2-pyrrolino-doxorubicin and deoxydoxorubicin) , epirubicin, esorubicin, idarubicin,
marcellomycin, mitomycins such as mitomycin C, mycophenolic acid, nogalamycin, olivomycins, peplomycin, porfiromycin, puromycin, quelamycin, rodorubicin, streptonigrin, streptozocin, tubercidin, ubenimex, zinostatin, zorubicin; anti-metabolites such as methotrexate and 5-fluorouracil (5-FU) ; folic acid analogs such as denopterin, methotrexate, pteropterin, trimetrexate; purine analogs such as fludarabine, 6-mercaptopurine, thiamiprine, thioguanine; pyrimidine analogs such as ancitabine, azacitidine, 6-azauridine, carmofur, cytarabine, dideoxyuridine, doxifluridine, enocitabine, floxuridine; and rogens such as calusterone, dromostanolone propionate, epitiostanol, mepitiostane, testolactone; anti-adrenals such as aminoglutethimide, mitotane, trilostane; folic acid replenisher such as frolinic acid; aceglatone; aldophosphamide glycoside; aminol evulinic acid; eniluracil; amsacrine; bestrabucil; bisantrene; edatraxate; defofamine; demecolcine; diaziquone; elformithine; elliptinium acetate; an epothilone; etoglucid; gallium nitrate; hydroxyurea; lentinan; lonidainine; maytansinoids such as maytansine and ansamitocins; mitoguazone; mitoxantrone; mopidanmol; nitraerine; pentostatin; phenamet; pirarubicin; losoxantrone; podophyllinic acid; 2-ethylhydrazide; procarbazine;polysaccharide complex (JHS Natural Products, Eugene, Oreg. ) ; razoxane; rhizoxin; sizofuran; spirogermanium; tenuazonic acid; triaziquone; 2, 2', 2”-trichlorotriethylamine; trichothecenes (such as T-2 toxin, verracurin A, roridin A and anguidine) ; urethan; vindesine; dacarbazine; mannomustine; mitobronitol; mitolactol; pipobroman; gacytosine; arabinoside ( "Ara-C" ) ; cyclophosphamide; thiotepa; taxoids, e.g.,(paclitaxel; Bristol-Myers Squibb Oncology, Princeton, N.J. ) ,(Cremophor-free) , albumin-engineered nanoparticle formulations of paclitaxel (American Pharmaceutical Partners, Schaumberg, Ill. ) , and (doxetaxel; Rhone-Poulenc Rorer, Antony, France) ; chloranmbucil;(gemcitabine) ; 6-thioguanine; mercaptopurine; methotrexate; platinum analogs such as cisplatin and carboplatin; vinblastine; etoposide (VP-16) ; ifosfamide; mitoxantrone; vincristine; (vinorelbine) ; novantrone; teniposide; edatrexate; daunomycin; aminopterin; capecitabineib and ronate; CPT-11; topoisomerase inhibitor RFS 2000; difluoromethylornithine (DMFO) ; retinoids such as retinoic acid; and pharmaceutically acceptable salts, acids and derivatives of any of the above.
The "chemotherapeutic agent" can also be selected, for example, from: (i) anti-hormonal agents that act to regulate or inhibit hormone action on tumors such as anti-estrogens and selective estrogen receptor modulators (SERMs) , including, for example, tamoxifen (including tamoxifen citrate) , raloxifene, droloxifene, 4-hydroxytamoxifen, trioxifene, keoxifene, LY117018, onapristone, and(toremifine citrate) ; (ii) aromatase inhibitors that inhibit the enzyme aromatase, which regulates estrogen production in the adrenal gl and s, such as, for example, 4 (5) -imidazoles, aminoglutethimide,(megestrol acetate) , (exemestane; Pfizer) , formestanie, fadrozole,(vorozole) ,(letrozole; Novartis) , and(anastrozole; AstraZeneca) ; (iii) anti-and rogens such as flutamide, nilutamide, bicalutamide, leuprolide, and goserelin; as well as troxacitabine (a 1, 3-dioxolane nucleoside cytosine analog) ; (iv) protein kinase inhibitors; (v) lipid kinase inhibitors; (vi) antisense oligonucleotides, such asthose which inhibit expression of genes in signaling pathways implicated in aberrant cell proliferation, such as, for example, PKC-alpha, Ralf and H-Ras; (vii) ribozymes such as VEGF expression inhibitors (e.g.,) and HER2 expression inhibitors; (viii) vaccines such as gene therapy vaccines, for example,andrIL-2; a topoisomerase 1 inhibitor such asrmRH; (ix) anti-angiogenic agents such as bevacizumab (Genentech) ; and (x) pharmaceutically acceptable salts, acids and derivatives of any of the above.
The "chemotherapeutic agent" can also be selected, for example, from therapeutic antibodies such as alemtuzumab (Campath) , bevacizumab (Genentech) ; cetuximab (Imclone) ; panitumumab (Amgen) , rituximab (Genentech/Biogen Idec) , pertuzumab (2C4, Genentech) , trastuzumab (Genentech) , tositumomab (Bexxar, Corixia) , and the antibody drug conjugate, gemtuzumab ozogamicin (Wyeth) .
Humanized monoclonal antibodies with therapeutic potential as chemotherapeutic agents in combination with the at least one compound selected from compounds of Formula (I) (such as Formulae (II) ) , stereoisomers thereof, and pharmaceutically acceptable salt thereofmay,
for example, be selected from: alemtuzumab, apolizumab, aselizumab, atlizumab, bapineuzumab, bevacizumab, bivatuzumab mertansine, cantuzumab mertansine, cedelizumab, certolizumab pegol, cidfusituzumab, cidtuzumab, daclizumab, eculizumab, efalizumab, epratuzumab, erlizumab, felvizumab, fontolizumab, gemtuzumab ozogamicin, inotuzumab ozogamicin, ipilimumab, labetuzumab, lintuzumab, matuzumab, mepolizumab, motavizumab, motovizumab, natalizumab, nimotuzumab, nolovizumab, numavizumab, ocrelizumab, omalizumab, palivizumab, pascolizumab, pecfusituzumab, pectuzumab, pertuzumab, pexelizumab, ralivizumab, ranibizumab, reslivizumab, reslizumab, resyvizumab, rovelizumab, ruplizumab, sibrotuzumab, siplizumab, sontuzumab, tacatuzumab tetraxetan, tadocizumab, talizumab, tefibazumab, tocilizumab, toralizumab, trastuzumab, tucotuzumab celmoleukin, tucusituzumab, umavizumab, urtoxazumab, visilizumab, Nivolumab and Lambrolizumab.
Also provided herein is a composition comprising at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof, and at least one pharmaceutically acceptable carrier.
The composition comprising at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof can be administered in various known manners, such as orally, topically, rectally, parenterally, by inhalation spray, or via an implanted reservoir, although the most suitable route in any given case will depend on the particular host, and nature and severity of the conditions for which the active ingredient is being administered. The term "parenteral" as used herein includes subcutaneous, intracutaneous, intravenous, intramuscular, intraarticular, intraarterial, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques. The compositionsdisclosed herein may be conveniently presented in unit dosage form and prepared by any of the methods well known in the art.
The at least one compound selected from Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof can be administered orally in solid dosage forms, such as capsules, tablets, troches, dragées, granules and powders, or in liquid dosage forms, such as elixirs, syrups, emulsions, dispersions, and suspensions. The at least one compound selected from
compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein can also be administered parenterally, in sterile liquid dosage forms, such as dispersions, suspensions or solutions. Other dosages forms that can also be used to administer the at least one compound selected from Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein as an ointment, cream, drops, transdermal patch or powder for topical administration, as an ophthalmic solution or suspension formation, i.e., eye drops, for ocular administration, as an aerosol spray or powder composition for inhalation or intranasal administration, or as a cream, ointment, spray or suppository for rectal or vaginal administration.
Gelatin capsules containing the at least one compound and /or the at least one pharmaceutically acceptable salt thereof disclosed herein and powdered carriers, such as lactose, starch, cellulose derivatives, magnesium stearate, stearic acid, and the like, can also be used. Similar diluents can be used to make compressed tablets. Both tablets and capsules can be manufactured as sustained release products to provide for continuous release of medication over a period of time. Compressed tablets can be sugar coated or film coated to mask any unpleasant taste and protect the tablet from the atmosphere, or enteric coated for selective disintegration in the gastrointestinal tract.
Liquid dosage forms for oral administration can further comprise at least one agent selected from coloring and flavoring agents to increase patient acceptance.
In general, water, a suitable oil, saline, aqueous dextrose (glucose) , and related sugar solutions and glycols such as propylene glycol or polyethylene gycols can be examples of suitable carriers for parenteral solutions. Solutions for parenteral administration maycomprise a water soluble salt of the at least one compound describe herein, at least one suitable stabilizing agent, and if necessary, at least one buffer substance. Antioxidizing agents such as sodium bisulfite, sodium sulfite, or ascorbic acid, either alone or combined, can be examples of suitable stabilizing agents. Citric acid and its salts and sodium EDTA can also be used as examples of suitable stabilizing agents. In addition, parenteral solutions can further comprise at least one preservative, selected, for example, from benzalkonium chloride, methyl-and propylparaben, and chlorobutanol.
A pharmaceutically acceptable carrier is, for example, selected from carriers that are compatible with active ingredients of the composition (and in some embodiments, capable of stabilizing the active ingredients) and not deleterious to the subject to be treated. For example, solubilizing agents, such as cyclodextrins (which can form specific, more soluble complexes with the at least one compound and /or at least one pharmaceutically acceptable salt disclosed herein) , can be utilized as pharmaceutical excipients for delivery of the active ingredients. Examples of other carriers include colloidal silicon dioxide, magnesium stearate, cellulose, sodium lauryl sulfate, and pigments such as D&C Yellow #10. Suitable pharmaceutically acceptable carriers are described in Remington's Pharmaceutical Sciences, A. Osol, a standard reference text in the art.
The at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein can further be examined for efficacy in treating cancer by in vivo assays. For example, the at least one compound and /or the at least one pharmaceutically acceptable salts thereof disclosed herein can be administered to an animal (e.g., a mouse model) having cancer and its therapeutic effects can be accessed. Positive results in one or more of such tests are sufficient to increase the scientific storehouse of knowledge and hence sufficient to demonstrate practical utility of the compounds and /or salts tested. Based on the results, an appropriate dosage range and administration route for animals, such as humans, can also be determined.
For administration by inhalation, the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein may be conveniently delivered in the form of an aerosol spray presentation from pressurized packs or nebulisers. The at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein may also be delivered as powders, which may be formulated and the powder composition may be inhaled with the aid of an insufflation powder inhaler device. One exemplary delivery system for inhalation can bea metered dose inhalation (MDI) aerosol, which may be formulated as a suspension or solution of at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically
acceptable salts thereof disclosed herein in at least one suitable propellant, selected, for example, from fluorocarbons and hydrocarbons.
For ocular administration, an ophthalmic preparation may be formulated with an appropriate weight percentage of a solution or suspension of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein in an appropriate ophthalmic vehicle, such that the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and at least one pharmaceutically acceptable salts thereof disclosed herein is maintained in contact with the ocular surface for a sufficient time period to allow the compound to penetrate the corneal and internal regions of the eye.
Useful pharmaceutical dosage-forms for administration of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof disclosed herein include, but are not limited to, hard and soft gelatin capsules, tablets, parenteral injectables, and oral suspensions.
The dosage administered will be dependent on factors, such as the age, health and weight of the recipient, the extent of disease, type of concurrent treatment, if any, frequency of treatment, and the nature of the effect desired. In general, a daily dosage of the active ingredient can vary, for example, from 0.1 to 2000 milligrams per day. For example, 10-500 milligrams once or multiple times per day may be effective to obtain the desired results.
In some embodiments, a large number of unit capsules can be prepared by filling standard two-piece hard gelatin capsules each with, for example, 100 milligrams of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salt thereof disclosed herein in powder, 150 milligrams of lactose, 50 milligrams of cellulose, and 6 milligrams magnesium stearate.
In some embodiments, a mixture of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof a digestible oil such as soybean oil, cottonseed oil or olive oil can be prepared and injected by means of a
positive displacement pump into gelatin to form soft gelatin capsules containing 100 milligrams of the active ingredient. The capsules are washed and dried.
In some embodiments, a large number of tablets can be prepared by conventional procedures so that the dosage unit comprises, for example, 100 milligrams of the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof, 0.2 milligrams of colloidal silicon dioxide, 5 milligrams of magnesium stearate, 275 milligrams of microcrystalline cellulose, 11 milligrams of starch and 98.8 milligrams of lactose. Appropriate coatings may be applied to increase palatability or delay absorption.
In some embodiments, a parenteral composition suitable for administration by injection can be prepared by stirring 1.5%by weight of the at least one compound and /or at least an enantiomer, a diastereomer, or pharmaceutically acceptable salt thereof disclosed herein in 10%by volume propylene glycol. The solution is made to the expected volume with water for injection and sterilized.
In some embodiment, an aqueous suspension can be prepared for oral administration. For example, each 5 milliliters of an aqueous suspension comprising 100 milligrams of finely divided at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof, 100 milligrams of sodium carboxymethyl cellulose, 5 milligrams of sodium benzoate, 1.0 grams of sorbitol solution, U.S.P., and 0.025 milliliters of vanillin can be used.
The same dosage forms can generally be used when the at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salts thereof are administered stepwise or in conjunction with at least one other therapeutic agent. When drugs are administered in physical combination, the dosage form and administration route should be selected depending on the compatibility of the combined drugs. Thus the term "coadministration" is understood to include the administration of at least two agents concomitantly or sequentially, or alternatively as a fixed dose combination of the at least two active components.
The at least one compound selected from compounds of Formula (I) , stereoisomers thereof, and pharmaceutically acceptable salt thereof disclosed herein can be administered as the
sole active ingredient or in combination with at least one second active ingredient, selected, for example, from other active ingredients known to be useful for treating cancers in a patient.
The examples below are intended to be purely exemplary and should not be considered to be limiting in any way. Efforts have been made to ensure accuracy with respect to numbers used (for example, amounts, temperature, etc. ) , but some experimental errors and deviations should be accounted for. Unless indicated otherwise, temperature is in degrees Centigrade. Reagents were purchased from commercial suppliers such as Sigma-Aldrich, Alfa Aesar, or TCI, and were used without further purification unless otherwise indicated.
Unless otherwise indicated, the reactions set forth below were performed under a positive pressure of nitrogen or argon or with a drying tube in anhydrous solvents; the reaction flasks were fitted with rubber septa for the introduction of substrates and reagents via syringe; and glassware was oven dried and /or heat dried.
Unless otherwise indicated, column chromatography purification was conducted on a Biotage system (Manufacturer: Dyax Corporation) having a silica gel column or on a silica SepPak cartridge (Waters) , or was conducted on a Teledyne Isco Combiflash purification system using prepacked silica gel cartridges.
1H NMR spectra were recorded on a Varian instrument operating at 400 MHz. 1H-NMR spectra were obtained using CDCl3, CD2Cl2, CD3OD, D2O, d6-DMSO, d6-acetone or (CD3) 2CO as solvent and tetramethylsilane (0.00 ppm) or residual solvent (CDCl3: 7.25 ppm; CD3OD: 3.31 ppm; D2O: 4.79 ppm; d6-DMSO: 2.50 ppm; d6-acetone: 2.05; (CD3) 2CO: 2.05) as the reference standard. When peak multiplicities are reported, the following abbreviations are used: s (singlet) , d (doublet) , t (triplet) , q (quartet) , qn (quintuplet) , sx (sextuplet) , m (multiplet) , br (broadened) , dd (doublet of doublets) , dt (doublet of triplets) . Coupling constants, when given, are reported in Hertz (Hz) . All compound names except the reagents were generated by ChemDraw version 12.0.
In the following examples, the abbreviations below are used:
AcOH Acetic acid
Aq Aqueous
Brine Saturated aqueous sodium chloride solution
Bn Benzyl
BnBr Benzyl Bromide
CH2Cl2 Dichloromethane
DMF N, N-Dimethylformamide
Dppf 1, 1"-bis (diphenylphosphino) ferrocene
DBU 1, 8-diazabicyclo [5.4.0] undec-7-ene
DIEA or DIPEA N, N-diisopropylethylamine
DMAP 4-N, N-dimethylaminopyridine
DMF N, N-dimethylformamide
DMSO Dimethyl sulfoxide
EtOAc Ethyl acetate
EtOH Ethanol
Et2O or ether Diethyl ether
G grams
h or hr hour
HATU O- (7-Azabenzotriazol-1-yl) -N, N, N', N'-tetramethyluroni um hexafluorophosphate
HCl Hydrochloric acid
HPLC High-performance liquid chromatography
IPA 2-propanol
i-PrOH Isopropyl alcohol
Mg milligrams
mL milliliters
Mmol millimole
MeCN Acetonitrile
MeOH Methanol
Min minutes
ms or MS Mass spectrum
Na2SO4 Sodium sulfate
PE petroleum ether
PPA Polyphosphoric acid
Rt Retention time
Rt or rt Room temperature
TBAF Tetra-butyl ammonium fluoride
TBSCl tert-Butyldimethylsilyl chloride
TFA Trifluoroacetic acid
THF tetrahydrofuran
TLC thin layer chromatography
μL microliters
Example 1: Synthesis of Compounds 1.1-1.67
BL-1: (S) -Tert-butyl 3- (tosyloxy) piperidine-1-carboxylate
To a solution of (S) -tert-butyl 3-hydroxypiperidine-1-carboxylate (168 g, 0.836 mol, 1.0eq) in pyridine (1000 mL) was added tosyl chloride (TsCl, 176 g, 0.92 mol, 1.1 eq) slowly; the reaction mixture was stirred overnight at room temperature. The mixture was concentrated in vacuo to remove pyridine; the residue was dissolved in ethyl alcohol /H2O 1000 ml/600 ml, stirred for 30 min, the separated. EA layer was washed with water (500 ml x3) , brine (500 ml x2) , dried over Na2SO4, concentrated to remove about 800 ml EA. PE (1.5 L) was added and stirred overnight, the white solid was collected and dried in air to give the desired product (228 g) . 1H NMR (400 MHz, DMSO-d6) δ 7.79-8.81 (d, J=8.0Hz, 2H) , 7.48-7.50 (d, J=8.0Hz, 2H) , 4.47 (s, 1H) , 3.38-3.65 (m, 2H) , 2.93-3.06 (m, 1H) , 2.42 (s, 3H) , 1.50-1.76 (m, 3H) , 1.35 (s, 11 H)
BL-2: (S) -tert-butyl 2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate
To a stirred solution of (S) -tert-butyl 2- (hydroxymethyl) pyrrolidine-1-carboxylate (20 g, 99.2 mmol) in CH2Cl2 (200 mL) was added Et3N (20 g, 0.198 mol) , DMAP (1.23 g, 9.92 mmol) , then the reaction mixture was cooled to 0℃ and Tosyl chloride (TsCl, 28.4 g, 0.149 mol) was added. After the addition, the reaction was stirred overnight. The reaction mixture was acidified to pH=4~5 with aq. HCl (1.0 M) , then extracted with brine, dried over Na2SO4, concentrated and
purified by column chromatography (silica gel weight: 30 g, petroleum ether/EtOAc=10: 1~2: 1) to give target compound (33 g, 93.7%) as yellow syrup, which was solidified after one day. 1H NMR (400 MHz, CDCl3) δ 7.79 (d, J=8.4 Hz, 2H) , 7.34 (d, J=8.4 Hz, 2H) , 4.11–4.05 (m, 1H) , 3.94 (br. s, 2H) , 3.29 (dd, J=13.2, 6.0 Hz, 2H) , 2.45 (s, 3H) , 2.02–1.74 (m, 4H) , 1.41 (s, 9H) . MS: M/e 356 (M+1) +
Compound 1.1: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
Step A: 2- ( (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) (hydroxy) methylene) malononitrile
To a solution of 2, 3-dihydrobenzo [b] [1, 4] dioxine-2-carboxylic acid (20.0 g, 111 mmol) in DCM (200 mL) was added oxalyl dichloride (30.0 g, 238 mmol) at 0 ℃, followed by 0.5 ml of DMF. The solution was stirred at 0 ℃ for 1 hour, and at ambient temperature for 2h, and then concentrated to dryness. The resulting oil was diluted in THF (200 mL) . Malononitrile (11.0 g, 167
mmol) was added at 0 ℃ and followed by TEA (24.6 g, 167 mmol) . The final solution was stirred at ambient temperature for 16 h. The reaction mixture was filtered through a celite pad and the filtrate was added 200 mL of H2O, extracted with EA (200mL x 3) . The combined extracts were washed with brine (200mL x 3) , dried over sodium sulfate anhydrous and concentrated to get crude product (25.5 g) as brown oil, which was used in next step directly. MS: M/e 229 (M+1) +
Step B: 2- ( (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) (methoxy) methylene) malononitrile
A solution of the product of Step A (25.5 g, 111 mmol) in EA (200 mL) was added aqueous HCl (15%, 100 mL) and the mixture was stirred at ambient temperature for 10 min. The layers were separated and the organics was dried over Na2SO4, concentrated and the resulted oil was dissolved with trimethoxymethane (200 mL) and heated at 100 ℃ for 2 hrs. The mixture was concentrated and the residue was purified by column chromatography to give the title product (17.1 g, 63%for 2 steps) as a light yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 7.02–6.87 (m, 4H) , 5.47 (dd, J=7.6, 2.8 Hz, 1H) , 4.64 (dd, J=12.0, 2.8 Hz, 1H) , 4.32 (s, 3H) , 4.10 (dd, J=12.0, 7.6 Hz, 1H) .
Step C: 5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carbonitrile
To a stirred solution of the product of Step B (17.0 g, 70.2 mmol) in EtOH (10 mL) was added hydrazine hydrate (4.5 g, 90 mmol) in drops at 0 ℃ over 10 min and the mixture was stirred at rt for 1 h. The mixture was concentrated and the residue was diluted with EA (200 mL) , washed with brine (100mL x 3) , dried over sodium sulfate anhydrous and concentrated. The resulting solid was purified by column chromatography to get the title product (14.5 g, 85%) as a light yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 11.79 (s, 1H) , 6.97–6.82 (m, 4H) , 6.44 (s, 2H) , 5.17 (dd,
J=8.0, 2.4 Hz, 1H) , 4.47 (dd, J=11.6, 2.4 Hz, 1H) , 4.27 (dd, J=11.6, 8.0 Hz, 1H) . MS: M/e 243 (M+1) +.
Step D: (3R) -tert-butyl 3- (5-amino-4-cyano-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
A mixture of the product of Step C (500 mg, 2.05 mmol) , (S) -tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (BL-1, 944 mg, 2.66 mmol) and Cs2CO3 (1.34 g, 4.1 mmol) in DMF (10 mL) was stirred at 70 ℃ for 24 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous, concentrated and purified by column chromatography eluting with PE: EA=1: 1to get the desired product (700 mg, 36%) as a yellow solid. MS: M/e 426 (M+1) +
Step E: (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin -2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
To a solution of the product of step D (600 mg, 1.41 mmol) in EtOH (5 mL) was added DMSO (2 mL) , 5N NaOH aqueous solution (2 mL) and followed by H2O2 (1 mL) . The solution was stirred at 70 ℃ for 1 h. The resulting solution was concentrated. The residue was washed by
water, extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 1 to get the desired product (400 mg, 64%) as yellow oil.
MS: M/e 444 (M+1) +
Step F: 5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of step E (400 mg, 0.90 mmol) in DCM (2 mL) was added TFA (2 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (310 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 344 (M+1) +
Step G: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step F (310 mg, 0.90 mmol) and NaHCO3 (454 mg, 5.40 mmol) in CH3CN/H2O (7 mL/7 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (81 mg, 0.90 mmol) was added dropwise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched
by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous, concentrated and purified by silica gel column chromatography eluting with DCM: MeOH=20: 1 to get the desired product (250 mg, 70%) as a white solid. 1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.00–6.79 (m, 4H) , 6.77–6.54 (m, 3H) , 6.35 (s, 2H) , 6.05 (d, J=17.2 Hz, 1H) , 5.63 (d, J=9.2 Hz, 1H) , 5.35 (d, J=8.0 Hz, 1H) , 4.53 (d, J=11.2 Hz, 1H) , 4.41-4.32 (m, 1H) , 4.31-3.87 (m, 3H) , 3.28-3.18 (m, 1H) , 3.02-3.01 (m, 1H) , 2.04-1.77 (m, 3H) , 1.60-1.40 (m, 1H) ppm. MS: M/e 398 (M+1) +
Compound 1.2: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
Compound 1.2 was prepared according to the procedures described for Compound 1.1 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 6.98–6.78 (m, 4H) , 6.65 (s, 2H) , 6.61–6.46 (m, 1H) , 6.25 (s, 2H) , 6.22–5.95 (m, 1H) , 5.75-5.68 (m, 1H) , 5.37 (d, J=8 Hz, 1H) , 4.52 (d, J=11.6 Hz, 1H) , 4.44–4.31 (m, 1H) , 4.31–4.17 (m, 1H) , 4.15–4.02 (m, 1H) , 4.01–3.83 (m, 1H) , 3.61–3.30 (m, 2H) , 2.06–1.61 (m, 4H) ppm. MS: M/e 398 (M+1) +
Compound 1.3: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
Step A: 4, 5-dichlorobenzene-1, 2-diol
SO2Cl2 (27.2 g, 0.2 mmol) was added dropwise to a stirred solution of pyrocatechol (10 g, 91 mmol) in Et2O (100 mL) at 0℃ under N2. After the addition, the reaction was stirred for 3 hours. The reaction mixture was concentrated to give the residue, which was treated with petroleum ether and then filtered. The cake was collected to give target compound (11.6 g, 71.2%) as a white solid. 1H NMR (400 MHz, CDCl3) δ 6.98 (s, 2H) , 5.13 (s, 2H) ppm.
Step B: ethyl 6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxine-2-carboxylate
To a stirred solution of product of Step A (11.6 g, 61.4 mmol) in acetone (100 mL) was added K2CO3 (19.8 g, 0.14 mol) and ethyl 2, 3-dibromopropanoate (19 g, 73.6 mmol) . After the addition, the reaction mixture was stirred at 60℃ for 5 hours. The reaction mixture was filtered and the cake was washed with EtOAc (100 mL) . Then the filtrate was concentrated to give the residue, which was purified by column chromatography (petroleum ether/EtOAc=3: 1) to give target compound (13.8 g, 81.1%) as colorless oil, which was solidified after an hour. MS: M/e 277 (M+1) +
Step C: 6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxine-2-carboxylic acid
To a stirred mixture of the product of Step B (13.8 g, 49.8 mmol) in THF/H2O (50 mL/20 mL) was added LiOH. H2O (4.2 g, 99.6 mmol) . After the addition, the reaction mixture was stirred overnight. Most THF was removed in vacuo, the aqueous layer was acidified to pH=4~5 with aq. HCl, then extracted with EtOAc (20 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4 and concentrated to give target compound (10 g, 80.6%) as a light yellow solid. MS: M/e 248 (M-1) -
Step D: 2- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxine-2-carbonyl) malononitrile
To a stirred solution of the product of Step C (5.0 g, 20.1 mmol) in CH2Cl2 (50 mL) was added HOBT (3.2 g, 24 mmol) and Et3N (4.0 g, 40 mmol) , then EDCI (4.6 g, 24 mmol) and malononitrile (1.3 g, 20.1 mmol) . After the addition, the reaction was stirred for 3 hours. The
reaction mixture was poured into H2O (200 mL) , then extracted with CH2Cl2 (50 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4, concentrated to give the residue, which was dissolved in EtOAc (150 mL) and stirred with aq. HCl (6.0 M, 50 mL) for 2 hours, then separated. The EtOAc layer was washed with brine, dried over Na2SO4 and concentrated to give desired compound, which was directly used to the next step. MS: M/e 297 (M+1) +
Step E: 2- ( (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) (methoxy) methylene) malononitrile
A solution of the product of step D (5.97 g, 20.1 mmol) in trimethoxymethane (50 mL) was stirred at 90℃ for 6 hrs. The resulting solution was concentrated to give the residue, which was washed by water, extracted with EA (50 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with petroleum ether/EtOAc=5: 1~2: 1 to get the desired product (2.2 g, 35.2%) as a white solid. MS: M/e 311 (M+1) +
Step F: 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A solution of the product of step E (2.2 g, 7.07 mmol) and hydrazine hydrate (5 mL) in EtOH (20 mL) was stirred at rt for 30 min. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with petroleum ether/EtOAc=3: 1~1: 1 to get the desired product (1.5 g,
68.2%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 12.15 (s, 1H) , 7.23 (d, J=6.8 Hz, 2H) , 6.51 (s, 2H) , 5.28 (d, J=5.2 Hz, 1H) , 4.52 (dd, J=11.6, 2.4 Hz, 1H) , 4.34 (dd, J=9.2, 5.2 Hz, 1H) ppm. MS: M/e 311 (M+1) +
Step G: 5-amino-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step F (300 mg, 0.964 mmol) in MsOH (3 mL) was stirred at 70℃ for 2 hours. The reaction mixture was poured into H2O (30 mL) and basified to pH=9~10 with aq. NaOH, then extracted with EtOAc (10 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4, concentrated invacuo to give target compound (307 mg, 96.8%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 11.94 (s, 1H) , 7.24 (d, J=4.4 Hz, 2H) , 6.72 (br. s, 2H) , 6.04 (s, 2H) , 5.54 (s, 1H) , 4.60 (dd, J=11.6, 2.4 Hz, 1H) , 4.46–4.32 (m, 1H) ppm. MS: M/e 329 (M+1) +
Step H: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
A mixture of the product of step H (100 mg, 0.304 mmol) , (S) -tert-butyl 2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate (BL-2, 129 mg. 0.364 mmol) and Cs2CO3 (198 mg, 0.608 mmol) in DMF (3 mL) was stirred for 2 hours at 70℃. The reaction mixture was poured into H2O (20 mL) and extracted with EtOAc (15 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4, concentrated and purified by column chromatography
(petroleum ether/EtOAc=1: 1) to give target compound (90 mg, 57.8%) as a white solid. MS: M/e 512 (M+1) +
Step I: 5-amino-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1- ( (S) -pyrrolidin-2-ylmethyl) -1H-pyrazole-4-carboxamide
To the solution of the product of step H (90 mg, 0.176 mmol) in DCM (2 mL) was added TFA (1 mL) . The solution was stirred at rt overnight. The resulting solution was concentrated to get the crude product as yellow oil, which was used in next step directly. MS: M/e 412 (M+1) +
Step J: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6, 7-dichloro-2, 3-dihydrobenzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step I (0.176 mmol) and NaHCO3 (29 mg, 0.352 mmol) in CH3CN/H2O (3 mL/3 mL) was stirred at 0℃ for 5 min. Acryloyl chloride (15.9 mg, 0.176 mmol) was added dropwise at 0℃. The final solution was stirred at 0℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by prep-HPLC to get the desired product (20 mg, 22%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.25–7.15 (m, 2H) , 6.73 (br. s, 2H) , 6.55 (m, 1H) , 6.33 (br. s, 1H) , 6.20–5.93 (m, 2H) , 5.68 (dd, J=10.4 Hz, 1H) , 5.53–5.43 (m, 1H) , 4.53 (t, J=12.8 Hz, 1H) , 4.35 (dd, J=11.5, 8.4 Hz, 1H) , 4.15 (s, 1H) , 4.05 (d, J=14.2 Hz, 1H) , 3.96–3.82 (m, 2H) , 1.81 (m, 5H) ppm. MS: M/e 466 (M+1) +
Compound 1.4: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (6, 7-dichloro-2, 3-dihydro benzo [b] [1, 4] dioxin-2-yl) -1H-pyrazole-4-carboxamide
Compound 1.4 was prepared according to the procedures described for Compound 1.3 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ 7.30–7.22 (m, 2H) , 6.94–6.33 (m, 5H) , 6.18–6.03 (m, 1H) , 5.69–5.56 (m, 1H) , 5.49 (d, J=6.4 Hz, 1H) , 4.64–4.53 (m, 1H) , 4.46–4.34 (m, 1H) , 4.29–4.12 (m, 2H) , 4.09–3.96 (m, 1H) , 3.16–2.95 (m, 1H) , 2.07–1.73 (m, 4H) , 1.57–1.36 (m, 1H) ppm. MS: M/e 466 (M+1) +
Compound 1.5: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
Step A: 2-aminophenol
The mixture of 2-nitrophenol (20 g, 215.66 mmol) and Tin (II) chloride dihydrate (223 g, 1.08 mol) in EtOH (500 mL) was stirred at 85 ℃ for 12 hrs. The resulting solution was concentrated. The residue was poured into ice water (500 mL) , basified by 5N NaOH aqueous solution till pH=8, then extracted with EA (200 mL) . The suspension was filtered through a celite pad. The filtrate was extracted with EA (200 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get the desired compound (20 g, 85%) as a black solid. MS: M/e 110 (M+1) +
Step B: ethyl 3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
A mixture of the product of Step A (20 g, 183.24 mmol) , ethyl 2, 3-dibromopropanoate (57.16 g, 219.92 mmol) and K2CO3 (70.80 g, 513.08 mmol) in acetone (80 mL) was stirred at reflux for 5 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (50 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography
eluting with PE: EA=5: 1to get the desired product (26 g, 68%) as red-brown oil. MS: M/e 208 (M+1) +
Step C: ethyl 4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
To a solution of the product of Step B (26 g, 125.46 mmol) in HOAc (100 mL) was added 60%HCHO aqueous solution (25.10 g, 501.84 mmol) . The reaction mixture was stirred at rt for 10 min. Then the mixture was cooled to 0 ℃, Sodium cyanoborohydride (15.77 g, 250.92 mmol) was added several portions for 15 min at 0 ℃. The final solution was stirred at rt for 30 min. The resulting mixture was poured into ice water (100 mL) , neutralized by 5N NaOH aqueous solution till pH=7, then extracted with EA (200 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=5: 1to get the desired product (19.7 g, 71%) as yellow oil.
MS: M/e 222 (M+1) +
Step D: 4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylic acid
To a solution of the product of Step C (19.7 g, 89.04 mmol) in EtOH (40 mL) was added 6N NaOH (17.8 g, 445.20 mmol) aqueous solution at 0 ℃. The solution was stirred at rt for 1 h. The resulting solution was neutralized by 2N HCl aqueous solution till pH=6. The white solid was formed and filtered to get the desired product (17.20 g, 100%) as a white solid, which was used in next step directly. 1H NMR (400 MHz, DMSO-d6) δ 6.83–6.52 (m, 4H) , 4.78 (t, J=4.0 Hz, 1H) , 3.32 (d, J=4.0 Hz, 2H) , 2.78 (s, 3H) ppm. MS: M/e 194 (M+1) +
Step E: 2- (hydroxy (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) methylene) malononitrile
To a solution of the product of step D (17.20 g, 89.02 mmol) in DCM (50 mL) was added HOBT (14.42 g, 106.83 mmol) , Et3N (25.69 mL, 178.04 mmol) followed by EDCI (20.48 g, 106.83 mmol) . The solution was stirred at rt for 30 min. The malononitrile (7.06 g, 106.83 mmol) was added. The final solution was stirred at rt for 2-3 hrs. The resulting solution was concentrated, the residue was diluted in EA (100 mL) , washed by saturated NaHCO3 aqueous solution followed by saturated NH4Cl aqueous solution. The organic layer was washed by 6 N HCl aqueous solution. The organic layer was separated and concentrated to get crude product (21.48 g, 100%) as yellow oil, which was used in next step directly. MS: M/e 242 (M+1) +
Step F: 2- (methoxy (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) methylene) malononitrile
A solution of the product of step E (21.48 g, 89.04 mmol) in trimethoxymethane (30 mL) was stirred at 90 ℃ for 2 hrs. The resulting solution was concentrated and purified by silica gel column chromatography eluting with PE: EA=5: 1to get the desired product (5 g, 22%) as yellow oil. MS: M/e 256 (M+1) +
Step G: 5-amino-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carbonitrile
A solution of the product of step F (5 g, 19.59 mmol) and hydrazine hydrate (2 mL) in EtOH (4 mL) was stirred at rt for 10 min. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with DCM: MeOH=40: 1-20: 1 to get the desired product (4 g, 80%) as a yellow solid. MS: M/e 256 (M+1) +
Step H: (3R) -tert-butyl 3- (5-amino-4-cyano-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
A mixture of the product of step G (581 mg, 2.28 mmol) , (S) -Tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (BL-1, 970 mg, 2.73 mmol) and Cs2CO3 (1.49 g, 4.56 mmol) in DMF (10 mL) was stirred at 70 ℃ for 24 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 1to get the desired product (654 mg, 65%) as yellow oil. MS: M/e 439 (M+1) +
Step I: (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
To a solution of the product of step H (654 mg, 1.49 mmol) in EtOH (5 mL) was added DMSO (2 mL) , 5N NaOH aqueous solution (2 mL) followed by H2O2 (1 mL) . The solution was stirred at 70 ℃ for 1 h. The resulting solution was concentrated. The residue was washed by water, extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 4 to get the desired product (305 mg, 45%) as yellow oil. MS: M/e 457 (M+1) +
Step J: 5-amino-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of step I (305 mg, 0.67 mmol) in DCM (3 mL) was added TFA (1 mL) . The solution was stirred at rt for 1 hrs. The resulting solution was concentrated to get the crude product (238mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 357 (M+1) +
Step K: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step J (238 mg, 0.67 mmol) and NaHCO3 (337 mg, 4.02 mmol) in CH3CN/H2O (5 mL/5 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (60 mg, 0.67 mmol) was added drop wise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with DCM: MeOH=20: 1 to get the desired product (90 mg, 32%) as white solid. 1H NMR (400 MHz, DMSO-d6, 80℃) δ 6.84 (t, J=7.6 Hz, 1H) , 6.79–6.71 (m, 3H) , 6.69 (s, 2H) , 6.57 (t, J=7.6 Hz, 1H) , 6.34 (s, 2H) , 6.12–5.99 (m, 1H) , 5.69–5.57 (m, 1H) , 5.23 (dd, J=8.8, 2.6 Hz, 1H) , 4.28–3.98 (m, 3H) , 3.64–3.54 (m, 1H) , 3.53–3.43 (m, 1H) , 3.33–3.23 (m, 1H) , 3.16–3.03 (m, 1H) , 2.89 (s, 3H) , 2.06–1.78 (m, 3H) , 1.60–1.40 (m, 1H) ppm. MS: M/e 411 (M+1) +
Compound 1.6 was prepared according to the procedures described for Compound 1.5 under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.6: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6) ε 7.00–6.79 (m, 2H) , 6.81–6.72 (m, 2H) , 6.67–6.55 (m, 2H) , 6.30–5.98 (m, 1H) , 5.79–5.42 (m, 1H) , 5.33–5.21 (m, 1H) , 4.45–4.16 (m, 1H) , 4.13–3.88 (m, 2H) , 3.65–3.34 (m, 4H) , 2.89 (s, 3H) , 1.98–1.71 (m , 4H) . MS: M/e 411 (M+1) +
Compound 1.7: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
Step A: ethyl 6-fluoro-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
To a suspension of 2-amino-4-fluorophenol (12.7 g, 100 mmol) and K2CO3 (34 g, 250 mmol) in acetone (200 mL) was added ethyl 2, 3-dibromopropanoate (28.6 g, 110 mmol) . The resulting mixture was stirred at reflux for 4 hrs. The mixture was cooled to room temperature and
concentrated. The residue was washed by water, extracted with EA (50 mL x 4) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=5: 1to give brown oil. PE/EA (30/1, 60 mL ) was added to the oil and the mixture was stirred at room temperature for 30 min. The solid was formed, filtered and dried to give the desired product (3.6 g, 16%) as a brown solid. 1H NMR (400 MHz, DMSO-d6) δ 6.71 (dd, J=8.8, 5.6 Hz, 1H) , 6.36 (dd, J=10.8, 3.2 Hz, 1H) , 6.31–6.26 (m, 1H) , 6.15 (s, 1H) , 4.90 (t, J=4.0 Hz, 1H) , 4.12 (q, J=7.2 Hz, 2H) , 4.41–3.39 (m, 2H) , 1.17 (t, J=6.8 Hz, 3H) . ppm. MS: M/e 226 (M+1) +
Step B: ethyl 6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
To a solution of the product of Step A (3.6 g, 16 mmol) in EtOH (40 mL) was added 40%HCHO aqueous solution (25 mL) and Pd/C (0.5 g) . The reaction mixture was stirred at rt under H2 atmosphere (balloon) for 16 hrs. Then the mixture was filtered through a pad of celite, washed with EtOH (40 mL) . The filtrate was concentrated to give the desired product (5 g, crude) as black oil which used directly for next step without further purification. MS: M/e 240 (M+1) +
Step C: 6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylic acid
To a solution of the product of Step B (5 g, crude) in EtOH (50 mL) was added a solution of sodium hydroxide (2.56 g, 64 mmol) in water (20 mL) . The solution was stirred at rt for 3 h. The mixture was concentrated. The resulting residue was neutralized by 2N HCl aqueous solution till pH=6. A solid was formed and filtered to get the desired product (1.3 g, 38.5%for two steps) as an off-white solid. 1H NMR (400 MHz, DMSO-d6) δ 6.60 (dd, J=8.4, 5.6 Hz, 1H) , 6.41 (dd, J=
12, 3.2 Hz, 1H) , 6.28-6.23 (m, 1H) , 4.14-4.11 (m, 1H) , 3.45-3.39 (m, 1H) , 3.14-3.09 (m, 1H) , 2.78 (s, 3H) ppm. MS: M/e 212 (M+1) +
Step D: 2- ( (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (hydroxy) methylene) malononitrile
To a solution of the product of Step C (1.3 g, 6.16 mmol) in DCM (20 mL) was added HOBT (1 g, 7.39 mmol) , Et3N (1.26 g, 12.5 mmol) followed by EDCI (1.4 g, 7.39 mmol) . The solution was stirred at rt for 30 min. The malononitrile (0.4 g, 6.16 mmol) was added. The final solution was stirred at rt for 16 hrs. The resulting solution was concentrated, the residue was diluted in EA (100 mL) , washed by saturated NaHCO3 aqueous solution followed by saturated NH4Cl aqueous solution. The organic layer was washed by 10%H2SO4 aqueous solution. The organic layer was separated and concentrated to get crude product (1.5 g, 93%) as a solid, which was used in next step directly. 1H NMR (400 MHz, DMSO-d6) δ 6.66–6.64 (m, 1H) , 6.50 (dd, J=11.6, 3.2 Hz, 1H) , 6.34-6.29 (m, 1H) , 4.67 (dd, J=7.6, 2.8 Hz, 1H) , 3.29-3.26 (m, 1H) , 3.20-3.15 (m, 1H) , 2.82 (s, 3H) ppm. MS: M/e 260 (M+1) +
Step E: 2- ( (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (methoxy) methylene) malononitrile
A solution of the product of step D (1.5 g, 5.8 mmol) in trimethoxymethane (30 mL) was stirred at 70 ℃ for 3 hrs. The resulting solution was concentrated and purified by silica gel column chromatography eluting with PE: EA=5: 1to get the desired product (0.25 g, 16%) as brown oil. MS: M/e 274 (M+1) +
Step F: 5-amino-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carbonitrile
A solution of the product of step E (0.25 g, 0.91 mmol) and hydrazine hydrate (2 mL) in EtOH (6 mL) was stirred at rt for 2 h. The resulting solution was concentrated. The residue was washed by water, extracted with EA (30 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to give the desired product (0.245 g, 100%) as yellow foam. MS: M/e 274 (M+1) +
Step G: (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
A mixture of the product of step F (245 mg, 0.9 mmol) , (S) -tert-butyl 2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate (BL-2, 383 mg, 1.08 mmol) and Cs2CO3 (585 mg, 1.8 mmol) in DMF (5 mL) was stirred at 70 ℃ for 5 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (30 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to give the desired product (400 mg, crude) as yellow oil. MS: M/e 457 (M+1) +
Step H: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
To a solution of the product of step G (400 mg, crude) in EtOH (5 mL) was added DMSO (2 mL) , 5N NaOH aqueous solution (2 mL) followed by H2O2 (2 mL) . The solution was stirred at 50 ℃ for 2 h. The resulting solution was concentrated. The residue was washed by water, extracted with EA (60 mL) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 1 to get the desired product (130 mg, 30%for three steps) as yellow oil. MS: M/e 475 (M+1) +
Step I: 5-amino-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1- ( (S) -pyrrolidin-2-ylmethyl) -1H-pyrazole-4-carboxamide
To the solution of the product of step H (130 mg, 0.274 mmol) in DCM (3 mL) was added TFA (1 mL) . The solution was stirred at rt for 3 hrs. The resulting solution was treated with saturated Na2CO3 aqueous solution to pH=8, extracted with DCM (30 mL x 2) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get
the crude product (100mg, 98%) as yellow oil, which was used in next step directly. MS: M/e 375 (M+1) +
Step J: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of step I (100 mg, 0.267 mmol) in CH3CN (4 mL) was added saturated NaHCO3 aqueous solution (1 mL) . The resulting solution was cooled to 0 ℃ and a solution of acryloyl chloride (24 mg, 0.267 mmol) in CH3CN (1 mL) was added dropwise. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (30 mL x 2) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by prep-TLC (DCM: MeOH=20: 1) to give the desired product (53 mg, 46%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 6.83 (br. s, 2H) , 6.74-6.70 (m, 1H) , 6.64–6.51 (m, 2H) , 6.45–6.40 (m, 2H) , 6.35–6.30 (m, 1H) , 6.24–6.18 (m, 1H) , 6.05–5.71 (m, 1H) , 5.25–5.21 (m, 1H) , 4.21–3.90 (m, 3H) , 3.65–3.40 (m, 4H) , 2.90 (s, 3H) , 2.00–1.74 (m, 4H) , ppm. MS: M/e 429 (M+1) +
Compound 1.8: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
Step A: 4, 5-difluoro-2-nitrophenol
To a solution of 3, 4-difluorophenol (37 g, 0.28 mol) in AcOH (200 mL) was added a solution of fuming HNO3 (10 mL) in AcOH (80 mL) dropwise to keep the temperature below 40℃ over about 2 hours. The mixture was slowly poured to ice water (300 mL) . A red solid was formed, filtered, and washed with water (1.8 L) . The solid was dried to give the desired product (36 g, 72%) as a red solid. 1H NMR (400 MHz, DMSO-d6) δ 11.46 (s, 1H) , 8.19–8.12 (m, 1H) , 7.19–7.13 (m, 1H) . ppm.
Step B: 2-amino-4, 5-difluorophenol
To a solution of the product of Step A (40 g, 228 mmol) in EtOH (200 mL) was added Pd/C (4 g) . The reaction mixture was stirred at rt under H2 atmosphere (balloon) for 3 days. Then the mixture was filtered through a pad of Celite, washed with EtOH (100 mL) . The filtrate was concentrated and the residue was treated with PE/EA (10/1, 300mL) . The suspension was stirred at rt for 0.5 hour. The solid was filtered, washed with PE, dried to give the desired product (30 g, 90%) as a black solid. 1H NMR (400 MHz, DMSO-d6) δ 9.39 (br. s, 1H) , 6.62–6.42 (m, 2H) , 4.68 (br. s, 2H) . ppm. MS: M/e 146 (M+1) +
Step C: ethyl 6, 7-difluoro-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
To a suspension of 2-amino-4-fluorophenol (10 g, 69 mmol) and K2CO3 (23.6 g, 172.5 mmol) in acetone (80 mL) was added ethyl 2, 3-dibromopropanoate (19.7 g, 76 mmol) . The resulting mixture was stirred at reflux overnight. The mixture was cooled to room temperature and concentrated. The residue was washed by water, extracted with EA (50 mL x 4) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE:EA=5:1 to give black oil. PE/EA (30/1, 60 mL ) was added to the oil and the mixture was stirred at room temperature for 30 min. The solid was formed, filtered and dried to give the desired product (4.5 g, 26.8%) as a brown solid. 1H NMR (400 MHz, DMSO-d6) δ 6.87 (dd, J=8.4, 3.6 Hz, 1H) , 6.56 (dd, J=8.4, 3.6 Hz, 1H) , 5.99 (s, 1H) , 4.96 (t, J=3.6 Hz, 1H) , 4.13 (q, J=7.2 Hz, 2H) , 4.40–3.34 (m, 2H) , 1.17 (t, J=6.8 Hz, 3H) . ppm. MS: M/e 244 (M+1) +
Step D: ethyl 6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylate
To a solution of the product of Step C (4.5 g, 18.5 mmol) in EtOH (40 mL) was added 40%HCHO aqueous solution (20 mL) and Pd/C (0.5 g) . The reaction mixture was stirred at rt under H2 atmosphere (balloon) for 36 hrs. Then the mixture was filtered through a pad of Celite, washed with EtOH (40 mL) . The filtrate was concentrated to give the desired product (8 g, crude) as black oil which used directly for next step without further purification. MS: M/e 258 (M+1) +
Step E: 6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazine-2-carboxylic acid
To a solution of the product of step D (8 g, crude) in EtOH (50 mL) was added 2N NaOH (25 mL) . The solution was stirred at rt for 4 h. The mixture was concentrated. The resulting residue was neutralized by 2N HCl aqueous solution till pH=6. The solid was formed and filtered to get the desired product (2 g) as a brown solid. The filtrate was extracted with EA (30 mL x 2) , washed with brine, dried over Na2SO4, filtered and concentrated to give a red solid (0.6 g) . 2.6 g of product was obtained in total (63%for two steps) . 1H NMR (400 MHz, DMSO-d6) δ 6.87 (dd, J=8.0, 3.6 Hz, 1H) , 6.76 (dd, J=8.0, 5.2 Hz, 1H) , 4.96 (t, J=3.2Hz, 1H) , 3.42–3.27 (m, 2H) , 2.78 (s, 3H) . ppm. MS: M/e 230 (M+1) +
Step F: 2- ( (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (hydroxy) methylene) malononitrile
To a solution of the product of step E (2.6 g, 11.35 mmol) in DCM (40 mL) was added HOBT (1.83 g, 13.6 mmol) , Et3N (2.3 g, 22.7 mmol) followed by EDCI (2.6 g, 13.6 mmol) . The solution was stirred at rt for 30 min. The malononitrile (0.74 g, 11.35mmol) was added. The final
solution was stirred at rt for 3 hrs. The resulting solution was concentrated, the residue was diluted in EA (100 mL) , washed by saturated NaHCO3 aqueous solution followed by saturated NH4Cl aqueous solution. The organic layer was washed by 10%H2SO4 aqueous solution and brine. The organic layer was separated and concentrated to get crude product (3 g, 95%) as a brown solid, which was used in next step directly. MS: M/e 278 (M+1) +
Step G: 2- ( (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) (methoxy) methylene) malononitrile
A solution of the product of step F (3 g, 10. 8 mmol) in trimethoxymethane (50 mL) was stirred at 70 ℃ for 3 hrs. The resulting solution was concentrated and purified by silica gel column chromatography eluting with PE:EA=5:1 to get the desired product (0.5g, 16%) as brown oil. MS: M/e 292 (M+1) +
Step H: 5-amino-3- (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carbonitrile
A solution of the product of step G (0.5 g, 1.7 mmol) and hydrazine hydrate (2 mL) in EtOH (5 mL) was stirred at rt for 1 h. The resulting solution was concentrated. DCM (4 mL) was added to the residue and the solid was formed. The solid was filtered and dried to give the product (0.3 g, 60%) as a yellow solid. MS: M/e 292 (M+1) +
Step I: (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (6, 7-difluoro-4-methyl-3, 4-dihydro -2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
A mixture of the product of step H (0.3 g, 1 mmol) , (S) -tert-butyl 2-( (tosyloxy) methyl) pyrrolidine-1-carboxylate (BL-2, 426 mg, 1.2 mmol) and Cs2CO3 (650 mg, 2 mmol) in DMF (5 mL) was stirred at 70 ℃ for 6 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (30 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to give the desired product (600 mg, crude) as yellow oil. MS: M/e 475 (M+1) +
Step J: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
To a solution of the product of step I (600 mg, crude) in EtOH (6 mL) was added DMSO (2 mL) , 5N NaOH aqueous solution (2 mL) followed by H2O2 (2 mL) . The solution was stirred at 50 ℃ for 3 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (30 mL x2) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography
eluting with PE:EA=1:1 to get the desired product (230 mg, 46%for two steps) as a white solid. MS: M/e 493 (M+1) +
Step K: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6, 7-difluoro-4-methyl-3, 4-dihydro-2H-benzo [b] [1, 4] oxazin-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of step H (230 mg, 0.274 mmol) in DCM (5 mL) was added TFA (1 mL) . The solution was stirred at rt for 4 hrs. The resulting solution was concentrated to dryness and the residue was dissolved in CH3CN (5 mL) . After cooling to 0 ℃, saturated NaHCO3 aqueous solution (2 mL) was added. Then a solution of acryloyl chloride (24 mg, 0.267 mmol) in CH3CN (1 mL) was added drop wise. The final solution was stirred at 0 ℃ for 30 min and quenched by water, then extracted with EA (40 mL) . The organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by prep-TLC (DCM:MeOH=20:1) to give the desired product (60 mg, 28%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 6.90 (t, J=10.0 Hz, 1H) , 6.84–6.68 (m, 3H) , 6.66–6.54 (m, 1H) , 6.37 (s, 2H) , 6.20 (dd, J=16.8, 2.4 Hz, 1H) , 5.72 (dd, J=10.4, 2.4 Hz, 1H) , 5.36–5.28 (m, 1H) , 4.40–4.20 (m, 1H) , 4.09–3.85 (m, 2H) , 3.65–3.38 (m, 4H) , 2.87 (s, 3H) , 2.00–1.70 (m, 4H) , ppm. MS: M/e 447 (M+1) +
Compound 1.9: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1-methyl-1, 2, 3, 4 -tetrahydroquinolin-3-yl) -1H-pyrazole-4-carboxamide
Step A: ethyl quinoline-3-carboxylate
To a stirred solution of quinoline-3-carboxylic acid (20 g, 0.12 mol) in EtOH (500 mL) was added sulfurous dichloride (25.6 mL, 0.36 mol) at room temperature. The mixture was stirred at 80 ℃ for 4 hours. The reaction was concentrated under reduced pressure. The residue was dissolved into EA (500 mL) . The organic phase was washed with saturated NaHCO3 aqueous solution and brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue (yellow solid, 22g, 96%) was used into next step directly. 1H NMR (400 MHz, DMSO-d6) δ 9.32 (s, 1H) , 8.99 (s, 1H) , 8.22 (d, J=8.4 Hz, 1H) , 8.13 (d, J=8.4 Hz, 1H) , 7.94 (t, J =7.6 Hz, 1H) , 7.74 (t, J=7.6 Hz, 1H) , 4.44 (q, J=7.2 Hz, 2H) , 1.41 (t, J=7.2 Hz, 3H) ppm. MS: M/e 202 (M+1) +
Step B: ethyl 1-methyl-1, 2, 3, 4-tetrahydroquinoline-3-carboxylate
To a stirred solution of the product of Step A (10 g, 0.05 mol) and paraformaldehyde (14.9 g, 0.5 mol) in acetic acid (200 mL) was added Sodium cyanoborohydride (15.7 g, 0.25 mol) carefully at room temperature. The reaction was concentrated under reduced pressure. The residue was diluted with saturated NaHCO3 aqueous solution and extracted with EA (100 mL x 2) . The combined organic phase was washed with brine, dried over anhydrate sodium sulfate and concentrated under reduced pressure. The residue (yellow solid, 7.5 g, 69%) was used into next step directly. 1H NMR (400 MHz, DMSO-d6) δ 7.00 (t, J=7.6 Hz, 1H) , 6.94 (d, J=7.2 Hz, 1H) , 6.62–6.52 (m, 2H) , 4.09 (q, J=7.2 Hz, 2H) , 3.45–3.30 (m, 1H) , 3.29–3.17 (m, 1H) , 3.00–2.86 (m, 3H) , 2.82 (s, 3H) , 1.20 (t, J=7.2 Hz, 3H) ppm. MS: M/e 220 (M+1) +
Step C: 1-methyl-1, 2, 3, 4-tetrahydroquinoline-3-carboxylic acid
To a solution of the product of Step B (7.5 g, 0.03 mol) in MeOH (150 mL) was added 2N NaOH (50 mL) aqueous solution at room temperature. The solution was stirred at 60 ℃for 2 hours. The reaction was concentrated under reduced pressure. The residue was diluted with water (100 mL) . The resulting solution was neutralized by 2N HCl aqueous solution till pH=6. The white solid was precipitated from the mixture. The mixture was filtered and the solid was dried in the infrared oven at 60 ℃. The solid (4.8 g, 72.7%) was used into next step directly. MS: M/e 192 (M+1) +
Step D: 2- (hydroxy (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) methylene) malononitrile
To a stirred solution of the product of Step C (4.8 g, 25 mmol) and HOBT (3.1 g, 30mmol) in DCM (40 mL) was added triethylamine (5.1 g, 50 mmol) at room temperature. The EDCI (5.8 g, 30 mmol) and malononitrile (1.7 g, 26 mmol) was added at room temperature. The mixture was stirred at room temperature for 2 hours. Water (40 mL) was added to quench the reaction. The mixture was extracted with DCM (40 mL x 2) . The combined organic phase was washed with brine, dried over anhydrate sodium sulfate and concentrated under reduced pressure. The residue was diluted with HCl/EA (6 N) . The mixture was stirred at room temperature for 0.5 hour. The mixture was concentrated under reduced pressure. The residue (crude product) was used into next step directly. MS: M/e 240 (M+1) +
Step E: 2- (methoxy (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) methylene) malononitrile
A solution of the product of step D (4.5 g, 18.8 mmol) in trimethoxymethane (100 mL) was stirred at 100 ℃ for 2 hours. The resulting solution was concentrated under reduced pressure. The residue was diluted with water (100 mL) and extracted with EA (100 mL x 2) . The combined organic phase was washed by brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography eluting with EA (100%) to afford the desired product (280 mg, 5.9%) as a yellow solid. MS: M/e 254 (M+1) +
Step F: 5-amino-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) -1H-pyrazole-4-carbo nitrile
A solution of the product of step E (280 mg, 1.1 mmol) and hydrazine hydrate (1 mL) in EtOH (5 mL) was stirred at room temperature for 30 min. The resulting solution was concentrated under reduced pressure. The residue was diluted with water (10 mL) and extracted with EA (10 mL x 2) . The combined organic phase was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluted with MeOH/DCM 1:20) to obtain the desired product (250 mg, 89.3%) as a yellow solid. MS: M/e 254 (M+1) +
Step G: (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3 -yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
A mixture of the product of step F (250 mg, 0.1 mmol) , (S) -tert-butyl 2-( (tosyloxy) methyl) pyrrolidine-1-carboxylate (BL-2, 421 mg, 0.12 mmol) and Cs2CO3 (644 mg, 0.2 mmol) in DMF (10 mL) was stirred at 70 ℃ overnight. The resulting solution was concentrated under reduced pressure. The residue was diluted with water (20 mL) and extracted with EA (20 mL x 2) . The combined organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The yellow oil (200 mg, 45.9%) was used into next step directly. MS: M/e 437 (M+1) +
Step H: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1-methyl-1, 2, 3, 4-tetrahydro quinolin-3-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
To a solution of the product of step G (200 mg, 0.46 mmol) in EtOH (3 mL) was added DMSO (0.5 mL) , 5N NaOH aqueous solution (0.5 mL) followed by H2O2 (0.5 mL) . The solution was stirred at 60 ℃ for 2 hours. The resulting solution was concentrated under reduced pressure. The residue was diluted with water (5 mL) and extracted with EA (10 mL x 2) . The combined organic phase was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography eluting with EA 100%to obtain the desired product (190 mg, 91%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 7.00 (t, J=7.6 Hz, 1H) , 6.92 (d, J=7.2 Hz, 1H) , 6.68–6.57 (m, 3H) , 6.53 (t, J=7.2 Hz, 1H) , 6.02 (s, 2H) , 3.98–3.88 (m, 2H) , 3.66–3.52 (m, 1H) , 3.42–3.35 (m, 1H) , 3.25–3.10 (m, 3H) , 2.91 (d, J=8.1 Hz, 2H) , 2.85 (s, 3H) , 2.54 (s, 2H) , 1.82–1.64 (m, 3H) , 1.42 (s, 9H) . MS: M/e 455 (M+1) +
Step I: 5-amino-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) -1- ( (S) -pyrrolidin-2-yl methyl) -1H-pyrazole-4-carboxamide
To the solution of the product of step H (190 mg, 0.42 mmol) in DCM (5 mL) was added TFA (0.5 mL) . The solution was stirred at room temperature for 1 hour. The resulting solution was concentrated to get the crude product (146 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 355 (M+1) +
Step J: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1-methyl-1, 2, 3, 4-tetrahydroquinolin-3-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step I (146 mg, 0.42 mmol) and saturated NaHCO3 aqueous solution (5 mL) in CH3CN (5 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (37 mg, 0.41 mmol) was added dropwise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 2) . The combined organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by prep-TLC to obtain the desired product (50 mg, 29%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.00 (t, J=7.6 Hz, 1H) , 6.96–6.90 (m, J=7.2 Hz, 1H) , 6.70–6.48 (m, 5H) , 6.26–6.16 (m, 1H) , 6.15–5.98 (m, 2H) , 5.76–5.44 (m, 1H) , 4.43–4.14 (m, 1H) , 4.07–3.87 (m, 2H) , 3.64–3.36 (m, 4H) , 3.24–3.10 (m, 1H) , 2.95–2.87 (m, 2H) , 2.85 (t, J=3.2 Hz, 3H) , 1.95–1.68 (m, 4H) . MS: M/e 409 (M+1) +
Compound 1.10: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-1,2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: methyl 6-fluoro-1-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
To a solution of NaH (2.7 g, 67 mmol) in dimethyl carbonate (25mL) was added the solution of 6-fluoro-3, 4-dihydronaphthalen-1 (2H) -one (5 g, 30.45 mmol) in dimethyl carbonate (25 mL) . The mixture was stirred at rt for 30 min then at 90 ℃ for 1 h. The reaction mixture was turned from the suspension to the solid state. The reaction was quenched by ice water (100 mL) , extracted with EA (100 mL x 3) . The combined organic layer was washed by brine (100 mL) , dried over anhydrous sodium sulfate then concentrated to get the crude product (6.8g, 100%) as yellow oil, which was used in next step directly. 1H NMR (400 MHz, CDCl3) δ 8.15–7.70 (m, 1H) , 7.10 –6.77 (m, 2H) , 3.76 (s, 3H) , 3.59 (dd, J=10.0, 4.8 Hz, 1H) , 3.11–2.90 (m, 1H) , 2.78 (t, J=7.8 Hz, 1H) , 2.78–2.52 (m, 1H) , 2.52–2.30 (m, 1H) . MS: M/e 223 (M+1) +
Step B: methyl 6-fluoro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
A mixture of the product of Step A (6.8g, 30.5 mmol) , HClO4 (0.5 mL) and Pd/C (1.0 g) in HOAc (30 mL) was stirred at rt under hydrogen atmosphere for 24 hrs. The mixture suspension was filtered through a celite pad. The filtrate was concentrated. The residue was diluted with EA (150 mL) , washed by brine (50 mL) , dried over anhydrous sodium sulfate and then concentrated to get the crude product (6.2 g, 100%) as yellow oil, which was used in next step directly. MS: M/e 209 (M+1) +
Step C: 6-fluoro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
A solution of the product of Step B (6.5 g, 30.5 mmol) and NaOH (4.9 g, 122 mmol) in MeOH (20 mL) and H2O was stirred at rt for 1 h. The mixture was concentrated. The residue was diluted with H2O (20 mL) and adjusted to pH=5-6 by 2N HCl. The precipitate was collected and filtered to get the desired product (6.0 g, 100%) as a white solid, which was used in next step directly. 1H NMR (400 MHz, DMSO-d6) δ 7.19–7.04 (m, 1H) , 6.97–6.80 (m, 2H) , 2.96–2.64 (m, 4H) , 2.60–2.51 (m, 1H) , 2.09–1.98 (m, 1H) , 1.74–1.56 (m, 1H) . MS: M/e 195 (M+1) +
Step D: 2- ( (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (hydroxy) methylene) malononitrile
To a solution of the product of Step C (3.9 g, 20 mmol) in DCM (20 mL) was added oxalyl dichloride (4 mL) , followed by 2drops of DMF at 0 ℃. The solution was stirred at rt for 2h, and then concentrated. The residue was diluted in THF (20 mL) . The malononitrile (2.0 g, 30 mmol) was added. Cooled to 0 ℃, TEA (6 mL, 40 mmol) was added drop wise. The final solution was stirred at 0 ℃ for 1 h. The resulting solution was washed by water (30 mL) , extracted with EA (50mL x 3) . The organic layer was washed by 6N HCl aqueous solution (50mL x 2) and brine (50mL) , dried over anhydrous sodium sulfate and concentrated to get crude product (5.0 g) as yellow oil, which was used in next step directly. MS: M/e 243 (M+1) +
Step E: 2- ( (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (methoxy) methylene) malononitrile
A solution of the product of step D (5 g, 20. 60 mmol) in trimethoxymethane (15 mL) was stirred at 70 ℃ for 5 hrs. The resulting solution was concentrated. The residue was diluted with EA (100 mL) , washed by brine (50 mL) , dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with PE:EA=5:1 to get the desired product (2.2 g, 43 %for 2 steps) as a yellow oil. MS: M/e 257 (M+1) +
Step F: 5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A solution of the product of step E (2.2 g, 8.6 mmol) and hydrazine hydrate (2 mL) in EtOH (10 mL) was stirred at rt for 10 min. The resulting solution was concentrated. The residue was diluted with EA (100 mL) , washed by brine (50 mL) , dried over anhydrous sodium sulfate then concentrated to get crude product (2.0 g, 91%) as a yellow solid, which was used in next step directly. 1H NMR (400 MHz, DMSO-d6) δ 11.66 (s, 1H) , 7.19–7.05 (m, , 1H) , 7.03–6.80 (m, 2H) , 6.27 (s, 2H) , 3.10–2.61 (m, 5H) , 2.16–2.02 (m, 1H) , 1.93–1.76 (m, 1H) . MS: M/e 257 (M+1) +
Step G: (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
A mixture of the product of step F (1.0 g, 3.9 mmol) , (R) -tert-butyl 2-(tosyloxy) pyrrolidine-1-carboxylate (BL-2, 1.5 g, 4.2 mmol) and Cs2CO3 (2.5 g, 7.6 mmol) in DMF (10 mL) was stirred at 70 ℃ for 5 hrs. The mixture was diluted with EA (50 mL) , washed with brine (20mL x 3) , dried, concentrated and purified by column chromatography eluting with CH2Cl2/MeOH (100:1 ~ 40:1) to afford the desired product (1.02 g, 58%) as yellow oil. MS: M/e 440 (M+1) +.
Step H: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
To a solution of the product of step G (1.02 g, 2.3 mmol) in EtOH (20 mL) and DMSO (1 mL) was added 5N NaOH aqueous solution (1 mL) , followed by H2O2 (1 mL) at rt. The mixture was stirred at 50 ℃ for 30 min. After removing EtOH, the residue was diluted with EA (500 mL) , washed with NaHSO3 (10 mL) and brine (20 mL x 3) , dried over anhydrous sodium sulfate, concentrated and purified by silica gel column chromatography eluting with CH2Cl2/MeOH (100:1 ~ 40:1) to get the desired product (950 mg, 90%) as brown oil.
1H NMR (400 MHz, DMSO-d6) δ 7.17–7.06 (m, 1H) , 6.98–6.86 (m, 2H) , 6.59 (s, 2H) , 6.05 (br. s, 2H) , 4.07–3.86 (m, 3H) , 3.51–3.31 (m, 2H) , 3.27–3.13 (m, 2H) , 2.98–2.75 (m, 4H) , 2.17–2.04 (m, 1H) , 1.88–1.55 (m, 5H) , 1.41 (s, 9H) . MS: M/e 458 (M+1) +.
Step I: 5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1- ( (S) -pyrrolidin-2-ylmethyl) -1H-pyrazole-4-carboxamide
To the solution of the product of step H (950 mg, 2.08 mmol) in DCM (20 mL) was added TFA (5 mL) at rt and the solution was stirred for 16 hrs. The mixture was concentrated to get the crude product (880 mg) as brown oil, which was used in next step directly. MS: M/e 358 (M+1) +.
Step J: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of step I (880 mg, crude) and NaHCO3 (400 mg, 4.76 mmol) in MeCN/H2O (10 mL/10 mL) was added dropwise a solution of acryloyl chloride (160 mg, 1.78
mmol) in MeCN (1 mL) at rt and the mixture was stirred for 1 h. The resulting mixture was extracted with EA (10 mL x 3) . The combined extracts were washed with brine (20 mL x 2) , dried over anhydrous sodium sulfate, concentrated and purified by silica gel column chromatography eluting with EA to give crude product (560 mg) , which was recrystallized in PE/EA (2:1, 40 mL) to give the desired product (425 mg, 50%for 2 steps) as a light yellow solid. 1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.13–7.04 (m, 1H) , 6.91–6.80 (m, 2H) , 6.54 (br. s, 1H) , 6.36 (s, 2H) , 6.16 (d, J=16.4 Hz, 1H) , 5.99 (s, 2H) , 5.75–5.35 (m, 1H) , 4.45–4.12 (m, 1H) , 4.11–3.81 (m, 2H) , 3.47 (br. s, 2H) , 3.39–3.26 (m, 1H) , 3.01–2.75 (m, 4H) , 2.18 -2.03 (m, 1H) , 1.91–1.65 (m, 5H) . MS: M/e 412 (M+1) +.
Compound 1.10a or 1.10b: (R or S) 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (R or S) (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
To a stirred solution of the product of step G in synthesis of Compound 1.10 (20 g, 46 mmol) in EtOH (200 mL) was added DMSO (20 mL) , and aq. NaOH (5.0 N, 20 mL) , followed by H2O2 (20 mL) at rt. After the addition, the reaction was stirred at 50℃ for 30 min. The reaction mixture was concentrated to give the residue, which was diluted with EtOAc (500 mL) , washed with brine (200 mL x 3) , dried over Na2SO4, and concentrated. The residue was purified by column chromatography (petroleum ether/EtOAc=2:1) to give desired product (13 g, 62%) as a yellow solid, which was separated by chiral HPLCto give peak 1 (5.20 g) and peak 2 (6.35 g) .Peak 1: 1H NMR (400 MHz, DMSO-d6) 7.10 (s, 1H) , 6.97–6.85 (m, 2H) , 6.59 (s, 2H) , 6.04 (s, 2H) , 4.10-3.80 (m, 3H) , 3.40–3.34 (m, 1H) , 3.23–3.12 (m, 2H) , 3.02–2.75 (m, 4H) , 2.10 (d, J=12.0 Hz, 1H) , 1.81–1.55 (m, 5H) , 1.40 (s, 9H) ppm. Peak 2: 1H NMR (400 MHz, DMSO-d6) δ7.17–7.05 (m, 1H) , 6.98–6.85 (m, 2H) , 6.59 (s, 2H) , 6.06 (s, 2H) , 4.09–3.78 (m, 3H) , 3.40–3.35 (m, 1H) , 3.23–3.11 (m, 2H) , 3.0–2.78 (m, 4H) , 2.11 (d, J=10.6 Hz, 1H) , 1.81–1.54 (m, 5H) , 1.41 (s, 9H) ppm. MS: M/e 458 (M+1) +
The chiral separation conditions are shown below:
Step B: (R or S) 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step A (1.0 mg, 2.2 mmol) in DCM (10 mL) was added TFA (5 mL) at 0℃ and the solution was stirred at rt for 2 hrs. The mixture was concentrated to get the crude product (1 g) as brown oil, which was used in next step directly. MS: M/e 358 (M+1) +
Step C: (R or S) 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6-fluoro-1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of Step B (1 g, crude, 2.2 mmol) and NaHCO3 (739 mg, 8.8 mmol) in MeCN/H2O (25 mL/25 mL) was added dropwise a solution of acryloyl chloride (200 mg, 2.2 mmol) in MeCN (2 mL) at 0℃ and the mixture was stirred at 0℃ for 10 min. The resulting mixture was extracted with EA (100 mL) , washed with brine (30 mL x 2) , dried over anhydrous sodium sulfate, concentrated and purified by silica gel column chromatography eluting with
DCM/MeOH (30: 1) to give the desired product (650 mg, 79% for 2 steps) as a white solid. Peak1 (Compound 1.10a, retention time: 5.219 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.19–7.08 (m, J=8.9 Hz, 1H) , 6.99–6.85 (m, J=8.0 Hz, 2H) , 6.72–6.52 (m, 2H) , 6.28–5.98 (m, 3H) , 5.78–5.42 (m, 1H) , 4.41–4.13 (m, 1H) , 4.07–3.84 (m, 2H) , 3.60–3.35 (m, 3H) , 3.06–2.74 (m, 4H) , 2.13–2.04 (m, 1H) , 1.96–1.62 (m, 5H) ppm. Peak 2 (Compound 1.10b, retention time: 6.182 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.19–7.06 (m, 1H) , 6.98–6.85 (m, 2H) , 6.68–6.47 (m, 2H) , 6.30–6.00 (m, 3H) , 5.79–5.44 (m, 1H) , 4.42–4.15 (m, 1H) , 4.09–3.82 (m, 2H) , 3.59–3.36 (m, 3H) , 3.02–2.75 (m, 4H) , 2.11 (d, J=11.2 Hz, 1H) , 1.93–1.62 (m, 5H) ppm. MS: M/e 412 (M+1) +
The chiral analysis conditions are shown below:
Compound 1.11: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (3R) -tert-butyl 3- (5-amino-4-cyano-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
A mixture of 5-amino-3- (7-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile (the product of step F in synthesis of Compound 1.10, 1.0 g, 4 mmol) , (S) -tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (BL-1, 2.1 g, 6 mmol) and Cs2CO3 (2.6 g, 8
mmol) in DMF (20 mL) was stirred at 70 ℃ for 24 hrs. The resulting solution was concentrated. The residue was diluted with EA (100 mL) , washed by brine (50mL x 2) , dried over sodium sulfate, concentrated and purified by silica gel column chromatography eluting with PE: EA=4: 1 to afford the crude product (700 mg) which was directly used in the next step. MS: M/e 440 (M+1) +
Step B: (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen -2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
To a solution of the product of Step A (700 mg, crude, 1.6 mmol) in EtOH (10 mL) and DMSO (2 mL) was added 6N NaOH aqueous solution (2 mL) , followed by H2O2 (2 mL) at rt. The mixture was stirred at 50 ℃ for 30 min. Removing EtOH, the residue was diluted with EA (100 mL) , washed with brine (50 mL x 2) , dried over anhydrous sodium sulfate, concentrated and purified by silica gel column chromatography eluting with PE: EA 1: 2 get the crude product (130 mg, 8% for 2 steps) as a yellow solid.
Step C: 5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step B (130 mg, 0.3 mmol) in DCM (5 mL) was added TFA (2 mL) at 0 ℃ . The solution was stirred at 0 ℃ for 0.5 hrs. The resulting solution was concentrated to get the crude product (150 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 358 (M+1) +
Step D: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (6-fluoro-1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of step I (150 mg, 0.28 mmol) and NaHCO3 (94 mg, 1.4 mmol) in CH3CN/H2O (10 mL/10mL) was added acryloyl chloride (25 mg, 0.28mmol) dropwise at 0 ℃. The mixture was stirred at 0 ℃ for 10 min. The resulting mixture was diluted with EA (80 mL) , washed with brine (30 mL) , dried over anhydrous sodium sulfate, concentrated and purified by prep-TLC DCM: MeOH=12: 1 to get the desired product (40 mg, 35%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.18–7.06 (m, 1H) , 6.98–6.72 (m, 3H) , 6.59 (s, 2H) , 6.34–6.16 (m, 2H) , 6.16–6.01 (m, 1H) , 5.76–5.59 (m, 1H) , 4.45–3.94 (m, 3H) , 3.50–3.30 (m, 2H) , 3.15–2.76 (m, 5H) , 2.18–2.04 (m, 1H) , 1.99–1.76 (m, 3H) , 1.75–1.59 (m, 1H) , 1.55–1.39 (m, 1H) . MS: M/e 412 (M+1) +
Compounds 1.12 and 1.13 were prepared according to the procedures described for Compound 1.11 under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.12: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (7-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6) δ 7.14–7.02 (m, 1H) , 6.92–6.81 (m, J=8.4 Hz, 2H) , 6.77–6.64 (m, 1H) , 6.45–6.29 (m, 2H) , 6.15–5.96 (m, 3H) , 5.68–5.59 (m, 1H) , 4.22–3.93 (m, 3H) , 3.40–3.25 (m, 2H) , 3.01–2.91 (m, 3H) , 2.86–2.76 (m, 2H) , 2.17–2.05 (m, 1H) , 1.98–1.77 (m, 3H) , 1.78–1.66 (m, 1H) , 1.56–1.38 (m, 1H) . MS: M/e 412 (M+1) +
Compound 1.13: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (7-fluoro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6) δ 7.12–7.05 (m, 1H) , 6.92–6.80 (m, 2H) , 6.61–6.46 (m, 1H) , 6.43–6.26 (m, 2H) , 6.21–5.90 (m, 3H) , 5.74–5.43 (m, 1H) , 4.41–4.16 (m, 1H) , 4.11–3.84 (m, 2H) , 3.54–3.30 (m, 3H) , 3.00–2.94 (m, 2H) , 2.85–2.77 (m, 2H) , 2.18–2.05 (m, 1H) , 1.90–1.70 (m, 5H) . MS: M/e 412 (M+1) +
Compound 1.14: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: methyl 1-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
To a solution of NaH (6.0 g, 150.68 mmol) in dimethyl carbonate (50 mL) was added the solution of 3, 4-dihydronaphthalen-1 (2H) -one (10 g, 68.50 mmol) in dimethyl carbonate (25 mL) . The mixture was stirred at rt for 30 min then at 85 ℃ for 2 h. The reaction mixture was turned from the suspension to solid state. The reaction was quenched by water (100 mL) , extracted with EA (100 mL x 2) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get the crude product (13.23g, 95%) as yellow oil, which was used in next step directly. MS: M/e 205 (M+1) +
Step B: methyl 1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
A mixture of the product of Step A (13.23 g, 64.78mmol) , HClO4 (1 mL) and Pd/C (1.3 g, 0.1 eq) in HOAc (50 mL) was stirred at rt under 4 atm hydrogen atmosphere for 24 hrs. The mixture suspension was filtered through a celite pad. The filtrate was concentrated. The residue was washed by water, extracted with EA (50 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get the crude product (10 g, 81%) as yellow oil, which was used in next step directly. MS: M/e 191 (M+1) +
Step C: 1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
To a solution of the product of Step B (10 g, 52.57 mmol) in MeOH (50 mL) was added 6N NaOH (10.51 g, 262.83 mmol) aqueous solution at 0 ℃. The solution was stirred at rt for 2 h. The resulting solution was neutralized by 2N HCl aqueous solution till pH=6. The white solid was formed and filtered to get the desired product (8.3 g, 90%) as a white solid, which was used in next step directly. 1H NMR (400 MHz, DMSO-d6) δ 7.13–7.01 (m, 4H) , 2.98–2.82 (m, 2H) , 2.81–2.73 (m, 2H) , 2.70–2.59 (m, 1H) , 2.13–2.03 (m, 1H) , 1.79–1.67 (m, 1H) ppm. MS: M/e 177 (M+1) +
Step D: 2- (hydroxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
To a solution of the product of Step C (18 g, 102.15 mmol) in DCM (40 mL) was added oxalyl dichloride (18 mL) followed by 5drops DMF at 0 ℃. The solution was stirred at rt for 30 min, then concentrated. The residue was diluted in THF (50 mL) . The malononitrile (10.11 g, 153.22 mmol) was added. Cooled to 0 ℃, the solution was added TEA (29 mL, 204.30 mmol) drop wise. The final solution was stirred at 0 ℃ for 1 h. The resulting solution was washed by water,
extracted with EA (50 mL x 3) . The organic layer was washed by 6N HCl aqueous solution. The organic layer was separated and concentrated to get crude product (22.80 g, 100%) as black oil, which was used in next step directly. MS: M/e 225 (M+1) +
Step E: 2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
A solution of the product of step D (22.8 g, 101.66 mmol) in trimethoxymethane (40 mL) was stirred at 70 ℃ for 4-5 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (50 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=10: 1to get the desired product (16 g, 66%) as a yellow solid. MS: M/e 239 (M+1) +
Step F: 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A solution of the product of step E (13 g, 54.56 mmol) and hydrazine hydrate (2 mL) in EtOH (10 mL) was stirred at rt for 30 min. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 1to get the desired product (7 g, 54%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 11.64 (br. s, 1H) , 7.09-7.02 (m, 4H) , 6.27 (br. s, 2H) , 3.03–2.90 (m, 3H) , 2.88–2.79 (m, 2H) , 2.15–2.04 (m, 1H) , 1.86 (s, 1H) ppm. MS: M/e 239 (M+1) +
Step G: (2S) -tert-butyl 2- ( (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
A mixture of the product of step F (200 mg, 0.84 mmol) , (S) -tert-butyl 2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate (BL-2, 328 mg, 0.92 mmol) and Cs2CO3 (548 mg, 1.68 mmol) in DMF (15 mL) was stirred at 70 ℃ for 2 h. The resulting solution was concentrated. The residue was washed by water, extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get the crude product (354 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 422 (M+1) +
Step H: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
To a solution of the product of step G (354 mg, 0.84 mmol) in EtOH (5 mL) was added DMSO (2 mL) , 5N NaOH aqueous solution (2 mL) followed by H2O2 (1 mL) . The solution was stirred at 60 ℃ for 2 h. The resulting solution was concentrated. The residue was washed by water, extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography
eluting with PE: EA=1: 1 to get the desired product (254 mg, 69%) as a yellow solid. MS: M/e 440 (M+1) +
Step I: 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- (1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of step H (254 mg, 0.58 mmol) in DCM (2 mL) was added TFA (1 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (196 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 340 (M+1) +
Step J: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step I (196 mg, 0.58 mmol) and NaHCO3 (291 mg, 3.47 mmol) in CH3CN/H2O (5 mL/5 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (51 mg, 0.58 mmol) was added dropwise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column
chromatography eluting with DCM: MeOH=20: 1 to get the desired product (60 mg, 26%) as white solid. 1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.07-7.05 (m, 4H) , 6.66-6.52 (m, 1H) , 6.34 (s, 2H) , 6.18-6.14 (m, 1H) , 5.99 (s, 2H) , 5.57-5.30 (m, 1H) , 4.40-4.22 (m, 1H) , 4.06-4.04 (m, 1H) , 3.95-3.81 (m, 1H) , 3.54-3.40 (m, 2H) , 3.35-3.25 (m, 1H) , 3.02–2.71 (m, 4H) , 2.20-2.00 (m, 1H) , 1.90-1.75 (m, 5H) ppm. MS: M/e 394 (M+1) +
Compound 1.14a or 1.14b: (R or S) 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (R or S) (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
To a stirred solution of the product of step G in synthesis of Compound 1.14 (2.0 g, 4.46 mmol) in EtOH (50 mL) was added H2O2 (2 mL) , aq. NaOH (5.0 N, 2 mL) , DMSO (2 mL) . After the addition, the reaction was stirred at 50℃ for 2 hours. The reaction mixture was concentrated to
give the residue, which was treated with EtOAc/brine, extracted with EtOAc (20 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4, and concentrated and purified by column chromatography (petroleum ether/EtOAc=5: 1~1: 1) to give desired product (2.23 g, 100%) as a yellow solid, which was separated by chiral HPLCto give peak 1 (0.93 g, earlier peak) and peak 2 (0.89 g, later peak) . The chiral separation conditions are shown below:
Peak1: 1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.58 (s, 2H) , 6.04 (s, 2H) , 4.57–3.80 (m, 4H) , 3.17 (s, 2H) , 3.03–2.75 (m, 4H) , 2.12 (d, J=14.4 Hz, 1H) , 1.82-1.58 (m, 5H) , 1.40 (s, 9H) ppm.
Peak 2: 1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.58 (s, 2H) , 6.06 (s, 2H) , 4.51–3.81 (m, 4H) , 3.18 (s, 2H) , 3.01–2.75 (m, 4H) , 2.13 (d, J=11.6 Hz, 1H) , 1.81–1.53 (m, 5H) , 1.41 (s, 9H) ppm. MS: M/e 440.5 (M+1) +
Step B: (R or S) 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
The product of Step A (0.93 g, 2.12 mmol) was added to CH2Cl2 (10 mL) , then TFA (2 mL) was added. After the addition, the reaction mixture was stirred overnight. Most solvent was removed to give the residue, which was basified to pH=9~10 with aq. NaOH and extracted with EtOAc (100 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4 and concentrated to give target compound (538 mg, 74.8%) as a white solid. MS: M/e 340.5 (M+1) +
Step C: (R or S) 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
NaHCO3 (267 mg, 3.18 mmol) was added to a stirred mixture of the product of Step B (538 mg, 1.59 mmol) in CH3CN/H2O (10 mL/10 mL) . Then the mixture was cooled to 0℃ and a solution of acryloyl chloride (143.6 mg, 1.59 mmol) in CH3CN (3 mL) was added dropwise. After the addition, the reaction was stirred for 10min. The reaction mixture was extracted with EtOAc (40 mL x 2) . The combined organic layers were washed with brine, dried over Na2SO4, concentrated to give the residue, which was purified by column chromatography (petroleum ether/EtOAc=3: 1~100%EtOAc) to give target compound (440 mg, 70.4%) as a light yellow solid.
Peak1 (Compound 1.14a, retention time: 4.756 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.74–6.44 (m, 2H) , 6.28–5.97 (m, 4H) , 5.82–5.36 (m, 1H) , 4.45–4.11 (m, 1H) , 4.09–3.83 (m, 2H) , 3.60–3.35 (m, 3H) , 3.08–2.70 (m, 4H) , 2.10 (d, J=11.2 Hz, 1H) , 2.02–1.61 (m, 5H) ppm.
Peak 2 (Compound 1.14b, retention time: 5.347 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.67–6.49 (m, 2H) , 6.28–5.97 (m, 4H) , 5.76–5.43 (m, 1H) , 4.42–4.14 (m, 1H) , 4.11–3.82 (m, 2H) , 3.59–3.36 (m, 3H) , 3.05–2.72 (m, 4H) , 2.13 (d, J=12.0 Hz, 1H) , 1.95–1.64 (m, 5H) ppm. . MS: M/e 394.5 (M+1) +
The chiral analysis conditions are shown below.
Chiral synthesis of Compound 1.14a: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (R) -4-benzyl-3- (3-phenylpropanoyl) oxazolidin-2-one
To a stirred solution of (R) -4-benzyloxazolidin-2-one (16.7 g, 94.3 mmol) , Et3N (19 g, 0.188 mol) and DMAP (1.1 g, 9.43 mmol) in CH2Cl2 (200 mL) was added dropwise a solution of 3-phenylpropanoyl chloride (17.4 g, 10.3 mmol) in CH2Cl2 (50 mL) at 0℃. After the addition, the reaction was stirred for 2 hours. The reaction mixture was washed with H2O (200 mL) , aq. HCl (2.0 M, 200 mL) , aq. NaHCO3 and brine, then dried over Na2SO4, concentrated to give the residue, which was washed with THF/Hexane (100 mL/100 mL) and filtered. The cake was collected, dried to give target compound (24 g, 82.3%) as a white solid. MS: M/e 310 (M+1) +
Step B: (S) -tert-butyl 3-benzyl-4- ( (R) -4-benzyl-2-oxooxazolidin-3-yl) -4-oxobutanoate
To a stirred solution of the product of Step A (24 g, 77.7 mmol) in dry THF (200 mL) was added dropwise Lithium diisopropylamide (LDA, 2.0 M, 46.6 mL, 93.24 mmol) at-70℃, then a solution of tert-butyl 2-bromoacetate (16.7 g, 85.4 mmol) in THF (20 mL) was added dropwise. After the addition, the reaction was stirred for an hour at room temperature. The reaction was quenched with aq. NH4Cl, and extracted with EtOAc (50 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4 and concentrated to give the residue, which was stirred at -5℃ with IPA/Hexane (50 mL/50 mL) and filtered. The cake was collected to give target compound (16 g, 48.6%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.38–7.17 (m, 10H) , 4.65–4.52 (m, 1H) , 4.32–4.18 (m, 2H) , 4.14 (dd, J=8.8, 2.4 Hz, 1H) , 2.97 (dd, J=13.2, 4.0 Hz, 2H) , 2.89 (dd, J=13.6, 7.6 Hz, 1H) , 2.69 (dd, J=16.8, 10.8 Hz, 1H) , 2.57 (dd, J=13.2, 9.2 Hz, 1H) , 2.25 (dd, J=16.8, 4.0 Hz, 1H) ppm. MS: M/e 368 (M-t-Bu+1) +
Step C: (S) -3-benzyl-4- ( (R) -4-benzyl-2-oxooxazolidin-3-yl) -4-oxobutanoic acid
To a stirred solution of the product of Step B (16 g, 37.8 mmol) in CH2Cl2 (200 mL) was added TFA (20 mL) . After the addition, the reaction mixture was stirred for two days. The reaction mixture was concentrated to give the residue, which was treated with aq. NH4Cl (50 mL) and extracted with EtOAc (50 mL x 3) . The combined organic layers were washed with brine, dried
over Na2SO4 and concentrated to give target compound (12.9 g, 92.4%) as a white solid. MS: M/e 368 (M +1) +
Step D: (S) -2-benzylsuccinic acid
To a stirred solution of the product of Step C (12.9 g, 34.96 mmol) in THF (50 mL) was added dropwise aq. H2O2 (30%, 15 mL) at 0℃, followed by a solution of LiOH (2.5 g, 104 mmol) in H2O (20 mL) . After the addition, the reaction was stirred overnight. The reaction mixture was quenched with aq. Na2SO3 (50 mL) , most THF was removed to give the aqueous layer, then extracted with EtOAc (50 mL x 3) . The aqueous layer was acidified to pH=3~4 with aq. HCl (2.0 M) , and extracted with EtOAc (50 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4, and concentrated to give the target compound (7 g, 100%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 12.22 (s, 2H) , 7.35–7.13 (m, 5H) , 2.98–2.84 (m, 2H) , 2.81–2.67 (m, 1H) , 2.42 (dd, J=16.8, 8.8 Hz, 1H) , 2.24 (dd, J=16.8, 4.4 Hz, 1H) ppm. MS: M/e 207 (M-1) -
Step E: (S) -4-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
A mixture of the product of step D (7 g, 33.6 mmol) in conc. H2SO4 (20 mL) was stirred at 60℃ for 20 min. The reaction mixture was poured into ice-H2O (150 mL) and extracted with EtOAc (50 mL x 3) . The combined organic layers were washed with brined, dried over Na2SO4 and concentrated to give the target compound (6.3 g, 100%) as a white solid, which was directly used to the next step. 1H NMR (400 MHz, DMSO-d6) δ 12.48 (s, 1H) , 7.85 (dd, J=7.6, 1.2 Hz,
1H) , 7.60–7.53 (m, 1H) , 7.37 (dd, J=16.0, 8.0 Hz, 2H) , 3.28–3.12 (m, 3H) , 2.79 (d, J=8.8 Hz, 2H) ppm. MS: M/e 191 (M +1) +
Step F: (R) -1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
The product of step E (6.3 g, 33.6 mmol) was dissolved in AcOH (40 mL) , HClO4 (0.5 mL) and Pd/C (500 mg) were added. Then the reaction mixture was stirred overnight under H2 (1 atm) . The reaction mixture was filtered and the filtrate was concentrated to give the residue, which was stirred with H2O (50 mL) for half an hour and filtered. The cake was collected, dried to give target compound (3 g, 50.7%) as a white solid. MS: M/e 177 (M +1) +
Step G: (R) -2- (hydroxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
To a solution of the product of step F (3 g, 17 mmol) in CH2Cl2 (30 mL) was added HOBT (2.7 g, 20.4 mmol) and Et3N (4.4 g, 34 mmol) followed by EDCI (3.9 g, 20.4 mmol) . After stirred for 20 min, malononitrile (1.12 g, 17 mmol) was added. Then the reaction mixture was stirred for 2 hours. The mixture was washed with H2O (30 mL) , brine, dried over Na2SO4 and concentrated to give the residue, which was dissolved in EtOAc (50 mL) and washed with aq. H2SO4 (4 M, 40 mL) , brine, dried over Na2SO4 and concentrated to give target compound (3.8 g, 99.7%) as a tan solid. MS: M/e 225 (M+1) +
Step H: (R) -2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile
A solution of the product of step G (3.8 g, 16.96 mmol) in trimethoxymethane (20 mL) was stirred at 70℃ for 4-5 hrs. The resulting solution was concentrated. The residue was washed with EtOH/Hexane (5 mL/10 mL) and filtered. The cake was collected to give target compound (2.2 g, 54.5%) as a white solid. MS: M/e 239 (M+1) +
Step I: (R) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A solution of the product of step H (2.2 g, 9.24 mmol) and hydrazine hydrate (2 mL) in EtOH (10 mL) was stirred at rt for 30 min. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over Na2SO4 and concentrated to give target compound (2.3 g, 100%) as a white solid. MS: M/e 239 (M+1) +
Step J: (R) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step I (1.0 g, 4.2 mmol) in MsOH (5 mL) was stirred at 70℃ for 3 hours. The reaction mixture was poured into H2O (20 mL) and basified to pH=8~9 with aq. NaOH, then extracted with EtOAc (10 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4 and concentrated to give target compound (770 mg, 71.6%) as a white solid. MS: M/e 257 (M+1) +
Step K: (S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
A mixture of the product of step J (100 mg, 0.39 mmol) , BL-2 (166 mg, 0.47 mmol) and Cs2CO3 (254 mg, 0.78 mmol) in DMF (5 mL) was stirred at 70℃ for 24 h. The resulting solution was poured into H2O (20 mL) and extracted with EtOAc (10 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4, concentrated and purified by column chromatography (petroleum ether/EtOAc=4: 1~EtOAc) to give the target compound (45 mg, 26%) as a yellow solid. MS: M/e 440 (M+1) +
Step L: 5-amino-1- ( (S) -pyrrolidin-2-ylmethyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a stirred solution of the product of step K (45 mg, 0.102 mmol) in CH2Cl2 (5 mL) was added TFA (1 mL) . After the addition, the reaction mixture was stirred for 2 hours. The reaction mixture was concentrated to give the residue, which was directly used to the next step without further purification. MS: M/e 340 (M+1) +
Step M: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a stirred solution of the product of step L (0.102 mmol) in CH3CN/H2O (3 mL/3 mL) was added NaHCO3 (17.1 mg, 0.204 mmol) , then a solution of acryloyl chloride (9.28 mg, 0.102 mmol) in CH3CN (1 mL) was added dropwise at 0℃. The reaction mixture was extracted with EtOAc (5 mL x 3) . The combined organic layers were washed with brine, dried over Na2SO4, concentrated and purified by Prep-HPLC to give target compound (12 mg, 29.7 %) in the form of TFA salt. 1H NMR (400 MHz, DMSO-d6+D2O) δ 7.08 (s, 4H) , 6.59 (dd, J=16.8, 10.4 Hz, 1H) , 6.26–6.12 (m, 1H) , 5.79–5.40 (m, 1H) , 4.43–4.14 (m, 1H) , 4.08–3.86 (m, 2H) , 3.49–3.31 (m, 3H) , 3.05–2.73 (m, 4H) , 2.10 (d, J=11.6 Hz, 1H) , 1.98–1.61 (m, 5H) ppm. MS: M/e 394 (M+1) +
Compound 1.15: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (3R) -tert-butyl 3- (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
A mixture of the product of step F in synthesis of Compound 1.14 (714 mg, 3 mmol) , (S) -Tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (BL-1, 1.6 g, 4.5 mmol) and Cs2CO3 (1.95 g, 6 mmol) in DMF (6 mL) was stirred at 70 ℃ for 24 hrs. Then another portion of BL-1 (1.6 g, 4.5 mmol) was added and the resulting mixture was heated at 70 ℃ for 24 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (40 mL x 2) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 5 to get the desired product (650 mg, crude) as a yellow solid. MS: M/e 422 (M+1) +
Step B: (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
To a solution of the product of Step A (650 mg, crude) in EtOH (5 mL) was added DMSO (2 mL) , 5N NaOH aqueous solution (2 mL) followed by H2O2 (2 mL) . The solution was stirred at 50 ℃ for 2 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (30 mL x 2) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 1 to get the desired product (300 mg, 23% for two steps) as a yellow solid. MS: M/e 440 (M+1) +
Step C: 5-amino-1- ( (R) -piperidin-3-yl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step B (300 mg, 0.68 mmol) in DCM (5 mL) was added TFA (2 mL) . The solution was stirred at rt for 2 hrs. The resulting solution was treated with saturated Na2CO3 aqueous solution to pH=8, extracted with DCM (30 mL x 2) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated to get the crude product (190mg, 83%) as yellow foam, which was used in next step directly. MS: M/e 340 (M+1) +
Step D: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of Step C (160 mg, 0. 47 mmol) in CH3CN (5 mL) was added saturated NaHCO3 aqueous solution (1 mL) . The resulting solution was cooled to 0 ℃ and a solution of acryloyl chloride (43 mg, 0.47 mmol) in CH3CN (1 mL) was added dropwise. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (30 mL x 2) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by prep-TLC (DCM: MeOH=20: 1) to give the desired product (68 mg, 37%) as a light yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 7.06–7.02 (m, 4H) 6.90–6.75 (m, 1H) , 6.60 (s, 2H) , 6.23 (s, 2H) , 6.10–5.99 (m, 1H) , 5.72–5.58 (m, 1H) , 4.44–3.90 (m, 3H) , 3.50–3.38 (m, 1H) , 3.15–2.76 (m, 6H) , 2.18–2.08 (m, 1H) , 2.00–1.79 (m, 3H) , 1.78–1.62 (m,1H) , 1.55–1.35 (m, 1H) ppm. MS: M/e 394 (M+1) +
Compound 1.15a or 1.15b: (R or S) 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (R or S) (3R) -tert-butyl3- (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
A mixture of the product of step F in synthesis of Compound 1.14 (4.7 g, 20 mmol) , BL-1 (8.52 g, 24 mmol) and Cs2CO3 (13 g, 40mmol) in DMF (50 mL) was stirred at 70 ℃ for 80 hrs. Another two portions of BL-1 (2 g, 5.6 mmol) were added in this period time. The resulting solution was concentrated. The residue was washed by water, extracted with EA (100 mL x 2) . The combined organic layer was washed with brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 5 to get the desired product (2.1 g, 25%) as a yellow solid. MS: M/e 422 (M+1) +
Step B: (R or S) (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
To a solution of the product of Step A (2.1 g, 5 mmol) in EtOH (20 mL) was added DMSO (5 mL) , 5N NaOH aqueous solution (5 mL) followed by H2O2 (5 mL) . The solution was stirred at 50 ℃ for 4 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (40 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with PE: EA=1: 1 to get the desired product (1.55 g, 70%) as a yellow solid. MS: M/e 440 (M+1) +. The product was separated by chiral prep-HPLC to give peak 1 and peak 2. The chiral separation conditions are shown below:
Step C: (R or S) 5-amino-1- ( (R) -piperidin-3-yl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step B (820 mg, 1.86 mmol) in DCM (10 mL) was added TFA (3 mL) . The solution was stirred at rt overnight. The resulting solution was concentrated to get the crude product which was used in next step directly. MS: M/e 340 (M+1) +
Step D: (R or S) 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of Step C in CH3CN (15 mL) and H2O (3 mL) was added NaHCO3 (1 g, 12 mmol) . The resulting solution was cooled to 0 ℃ and a solution of acryloyl chloride (300 mg, 1.86 mmol) in CH3CN (2 mL) was added dropwise. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (30 mL x 2) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by prep-HPLC. Most of CH3CN from collection was removed by concentration. The resulting solution was treated with saturated NaHCO3 solution to PH 8, extracted with DCM (50 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate, filtered then concentrated to give the desired product (300 mg, 41% for 2 steps) as a white solid.
Peak1 (Compound 1.15a, retention time: 5.85 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.12–7.04 (m, 4H) ,6.90–6.71 (m, 1H) , 6.59 (s, 2H) , 6.22 (s, 2H) , 6.15–6.02 (m, 1H) , 5.75–5.58 (m, 1H) , 4.44–3.94 (m, 3H) , 3.50–3.38 (m, 1H) , 3.15–2.75 (m, 6H) , 2.16–2.08 (m, 1H) , 2.00–1.79 (m, 3H) , 1.78–1.62 (m, 1H) , 1.55–1.35 (m, 1H) ppm. MS: M/e 394 (M+1) +
Peak2 (Compound 1.15b, retention time: 6.944 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.12–7.04 (m, 4H) , 6.90–6.71 (m, 1H) , 6.58 (s, 2H) , 6.21 (s, 2H) , 6.15–6.02 (m, 1H) , 5.75–5.58 (m, 1H) , 4.45–3.94 (m, 3H) , 3.50–3.36 (m, 1H) , 3.15–2.75 (m, 6H) , 2.18–2.06 (m, 1H) , 2.00–1.80 (m, 3H) , 1.76–1.62 (m, 1H) , 1.55–1.35 (m, 1H) ppm. MS: M/e 394 (M+1) +
The chiral analysis conditions are shown below.
Compound 1.15a was prepared according to the procedures described for chiral synthesis of Compound 1.14a under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.15a: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide in the form of CF3COOH salt
1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.93-6.70 (m, 1H) , 6.59 (s, 2H) , 6.38-5.97 (m, 2H) , 5.66 (dd, J=28.8, 10.4 Hz, 1H) , 4.48-3.91 (m, 3H) , 3.60-3.48 (m, 1H) , 3.15-2.75 (m, 6H) , 2.22-2.06 (m, 1H) , 2.05-1.79 (m, 3H) , 1.68 (s, 1H) , 1.45 (s, 1H) ppm. MS: M/e 394 (M+1) +
Compounds 1.16 -1.17 were prepared according to the procedures described for Compound 1.15 under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.16: 1- ( (R) -1-acryloylpyrrolidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.06–7.02 (m, 4H) , 6.54–6.20 (m, 3H) , 6.12–6.07 (m, 1H) , 5.25–5.15 (m, 2H) , 5.62 (d, J=9.6 Hz, 1H) , 4.87–4.80 (m, 1H) , 3.95–3.29 (m, 5H) , 3.01–2.65 (m, 4H) , 2.35–2.05 (m, 3H) , 1.80–1.69 (m, 1H) ppm. MS: M/e 380 (M+1) +
Compound 1.17: 1- ( (S) -1-acryloylpiperidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.06–7.02 (m, 4H) ,6.80–6.65 (m, 1H) , 6.34 (s, 2H) , 6.10–5.97 (m, 1H) , 5.68–5.57 (m, 1H) , 4.30–3.90 (m, 3H) , 3.38–3.28 (m, 1H) , 3.06–2.75 (m, 6H) , 2.18–2.06 (m, 1H) , 2.00–1.65 (m, 4H) , 1.56–1.40 (m, 1H) ppm. MS: M/e 394 (M+1) +
Compound 1.18: 1- (2-acrylamidobenzyl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
Step A: Ethyl 4-oxochroman-3-carboxylate and ethyl 4-hydroxy-2H-chromene-3-carboxylate
To a solution of chroman-4-one (8.8 g, 60 mmol) in dry THF (200 mL) was added LiHMDS (1 M, 72 mL, 72 mmol) at -78℃. After stirring for 40 min, ethyl carbonocyanidate (4.5 g, 90 mmol) was added dropwise and the resulting mixture was stirred from -78℃ to room temperature for two hours. Saturated aqueous of NH4Cl (200 mL) was added, extracted with EA (200 mL× 3) , combined the organic layers, dried over Na2SO4, evaporated the solvent and the residue was purified by column chromatography (PE/EA=100: 5) to give 9.0 g ethyl 4-oxochroman-3-carboxylate in 68% yield as a mixture of tautomer.
Step B: Chroman-3-carboxylic acid
To a slution of ethyl 4-oxochroman-3-carboxylate (7.7g, 35 mmol) in AcOH (40 mL) and HClO4 (2 mL) was added Pd/C (770 mg) and the resulting mixture was stirred at room temperature under H2 (0.4 MPa) for 6 hours. Filtered to remove Pd/C, the filtrate was evaporated,
washed with water and brine (100 mL × 2) to give crude ethyl chroman-3-carboxylate. Then hydrolyzed with LiOH (1.5 g, 36 mmol) in a solution of THF/H2O/MeOH (30 mL/30 mL/30 mL) at room temperature stirring for 1 hour, then evaporated the solvent and water (20 mL) was added to the residue, acidification with HCl (1 N) to pH=1-2, the white precipitate was collected by filtration, dried in vacuo to give 4.5 g in 73% yield for two steps. 1H NMR (400 MHz, CD3OD) δ 7.00-7.06 (m, 2 H) , 6.80 (t, J=7.6 Hz, 1 H) , 6.72 (d, J=8.0 Hz, 1 H) , 4.35 (dd, J=10.8 Hz, 1.6 Hz, 1H) , 4.08-4.13 (m, 1 H) , 2.94-3.01 (m, 3 H) . MS (ESI) m/e [M-1] +177.
Step C: 2- (Chroman-3-yl (hydroxy) methylene) malononitrile
A solution of chroman-3-carboxylic acid (1.5g, 8.4 mmol) in AcOEt (75 mL) was added Et3N (1.02 g, 10.1 mmol) , HOBt (1.37 g, 10.1 mmol) , EDCI (1.935 g, 10.1 mmol) and the mixture was stirred at room temperature for 0.5 h, then malononitrile (0.665 g, 10.1 mmol) was added to the mixture and the resulting mixture was stirred at room temperature for 2 hours. Water (100 mL) was added, the organic layer was isolated, and washed with brine, dried over Na2SO4. Filtered to remove Na2SO4, the solvent was evaporated and the residue was dissolved in AcOEt (100 mL) , H2SO4 (1 N, 20 mL) was added and the mixture was stirred for 0.5 h before isolated the organic layer, evaporated the solvent to give crude product and used for next step without further purification. MS (ESI) m/e [M+1] +227.0.
Step D: 5-Amino-3- (chroman-3-yl) -1H-pyrazole-4-carbonitrile
A solution of crude 2- (chroman-3-yl (hydroxy) methylene) malononitrile (8.4 mmol) in trimethoxymethane (50 mL) was heated at 100℃ for 1.5 hour. Then the solvent was evaporated
and the residue was dissolved in EtOH (20 mL) , followed by addition of hydrazine hydrate (1.5 mL) at 0℃ and the mixture was stirred for 0.5 h. Then the solvent evaporated and the residue was used for next step without further purification. MS (ESI) m/e [M+1] +241.0.
Step E: 5-Amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
A solution of crude 5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carbonitrile (8.4 mmol) in conc. H3PO4 (20 mL) was heated at 130℃ for 20 min. Then the mixture was cooled to room temperature and added dropwise to water (40 mL) with vigorous stirring, followed adjust pH to 7-8 with NaHCO3, extracted with EA (20 mL × 3) , combined the organic layer, washed with brine (50 mL × 2) , dried over Na2SO4, filtered to remove Na2SO4 and the filtrate was evaporated to give 550 mg crude product and this was used for next step without further purification. MS (ESI) m/e [M+1] +259.0.
Step F: 5-Amino-3- (chroman-3-yl) -1- (2-nitrobenzyl) -1H-pyrazole-4-carboxamide
A mixture of 5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide (380 mg, 1.47 mmol) and 1- (bromomethyl) -2-nitrobenzene (382 mg, 1.77 mmol) in DMF (10 mL) was stirred at room temperature for 1 hour. Water (50 mL) was added to the resulting mixture, followed by addition of NaCl (solid) with stirring and the brown precipitate was collected by filtration and the filter cake was washed with H2O, and then dried in vacuo, the crude product was used for next step without further purification. MS (ESI) m/e [M+1] +393.
Step G: 5-amino-1- (2-aminobenzyl) -3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
To a solution of crude 5-amino-3- (chroman-3-yl) -1- (2-nitrobenzyl) -1H-pyrazole-4-carboxamide (1.0 mmol) in MeOH (50 mL) was added Pd/C (100 mg) at room temperature and stirred overnight under an air balloon of H2. Filtered to remove Pd/C, evaporated the solvent and the crude yellow solid was used for next step without further purification. MS (ESI) m/e [M+1] +364.0.
Step H: 1- (2-acrylamidobenzyl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
To a solution of 5-amino-1- (2-aminobenzyl) -3- (chroman-3-yl) -1H-pyrazole-4-carboxamide (135 mg, 0.37 mmol) in CH3CN (10 mL) and H2O (2 mL) was added NaHCO3 (62 mg, 0.74 mmol) , followed by addition of acryloyl chloride (34 mg, 0.37 mmol) at 0℃ and the resulting mixture was stirred for 15 minutes. The product (29 mg) was obtained by purification with prep-HPLC. 1H NMR (400 MHz, DMSO-d6) δ 10.01 (s, 1 H) , 7.63 (d J=7.6 Hz, 1H, ) , 7.29 (t, J=7.6 Hz, 1H) , 7.05-7.13 (m, 3 H) , 6.94 (d, J=7.2 Hz, 1H) , 6.76-6.84 (m, 4 H) . 6.49-6.56 (m, 1H) , 6.29 (t, J=8.0 Hz, 2 H) , 5.79 (d, J=10.8 Hz, 1H) , 5.13 (s, 2 H) , 4.41 (dd, J=10.4, 2.4 Hz, 1H) , 3.90 (t, J=10.4 Hz, 1H) , 3.68-3.76 (m, 1 H) , 2.99 (d, J=8.0 Hz, 2H) . MS (ESI) m/e [M+1] +417.9.
Compound 1.19: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
Step A: (3R) -tert-Butyl 3- (5-amino-4-carbamoyl-3- (chroman-3-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
A mixture of (5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide (the product of step E in synthesis of Compound 1.18, 0.50 g, 1.93 mmol) , (S) -tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (BL-1, 0.897 g, 2.52 mmol) , cesium carbonate (0.943 g, 2.90 mmol) , DMF (10 mL) was stirred at 70℃ for 16 hours, cooled. (S) -tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (0.897 g, 2.52 mmol) , cesium carbonate (0.943 g, 2.90 mmol) was added and heated to 70℃ for 4 hours, cooled. Ethyl acetate (100 mL) was added, combined with another batch of the same Step And similar procedure (5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide (0.107 g, 0.416 mmol) ) , filtered. The filtrate was washed with water (10mL) , brine (20 mL x2) , dried over Na2SO4 and concentrated, purified by silica gel column (silica gel: 30 g, ethyl acetate: petroleum ether=2: 3, then dichloromethane : methanol=40: 1) to give (3R) -tert-butyl 3- (5-amino-4-carbamoyl -3- (chroman-3-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate (0.238 g, 28%) as a brown solid. 1H NMR (400 MHz, DMSO-d6) δ 7.05-7.12 (m, 2H) , 6.73-6.85 (m, 4H) , 6.20-6.21 (m, 2H) , 4.39-4.42 (m, 1H) , 3.62-4.04 (m, 5H) , 3.34-3.40 (m, 1H) , 2.97-3.01 (m, 3H) , 2.75-2.85 (m, 1H) , 1.79-1.91 (m, 3H) , 1.39 (s, 9H) . MS (ESI) m/e [M+1] + 442.
Step B: 5-Amino-3- (chroman-3-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide
(3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (chroman-3-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate (0.238 g, 0.54 mmol) was dissolved in dichloromethane (9 mL) , trifluoroacetic acid (1.5 mL) was added, the reaction mixture was stirred at room temperature for 4 hours, concentrated to give 5-amino-3- (chroman-3-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide in the form of trifluoroacetic acid salt as a brown semi-solid (0.452 g, 417%, crude, 0.54 mmol) . 1H NMR (400 MHz, DMSO-d6) δ 8.74-8.75 (m, 2H) , 8.47-8.50 (m, 1H) , 8.31-8.32 (m, 1H) , 7.09-7.13 (m, 2H) , 6.77-6.84 (m, 4H) , 4.36-4.39 (m, 2H) , 4.04-4.06 (m, 1H) , 3.69-3.73 (m, 1H) , 3.32-3.37 (m, 2H) , 2.89-3.10 (m, 4H) , 1.65-1.91 (m, 4H) . MS (ESI) m/e [M+1] + 342.
Step C: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
A mixture of 5-amino-3- (chroman-3-yl) -1- ( (R) -piperidin-3-yl) -1H-pyrazole-4-carboxamide (0.452 g, crude, 0.54 mmol) , acetonitrile (3 mL) , water (1.5 mL) , NaHCO3 (solid, 0.36 g, 4.31 mmol) was cooled to 0℃, a solution of acryloyl chloride (73 mg, 0.81 mmol) was added. The reaction mixture was stirred at 0℃ for 30 minutes, concentrated, and water (10 mL) was added, extracted with ethyl acetate (10 mL) . The organic phase was separated and washed with brine (10 mL x2) , dried over Na2SO4 and concentrated, purified by prep-HPLC (Instrucment: gilson-281; Column: 21.2×150×5uM, gemini-new; Flow rate: 20ML/MIN; UV: 254nm; method: 0.1% FA in water and in CH3CN, CH3CN from 35 to 45 in 11 min, then from 45
to 90 in 3 min, 90 hold 3 min, then balance 2 min. Total run time 20 min. Single gradient method) to afford 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide (61 mg, 29%) as a white solid. 1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.03-7.09 (m, 2H) , 6.68-6.83 (m, 3H) , 6.49 (s, 2H) , 6.01-6.06 (m, 3H) , 5.60-5.63 (m, 1H) , 4.38-4.41 (m, 1H) , 3.87-4.16 (m, 4H) , 3.62-3.64 (m, 1H) , 2.97-3.02 (m, 4H) , 1.84-1.97 (m, 3H) , 1.47-1.50 (m, 1H) . MS (ESI) m/e [M+1] + 396.
Compound 1.20: 1- (2-acrylamidobenzyl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile (the product of step F in synthesis of Compound 1.14, 1.5 g, 6.3 mmol) in methanesulfonic acid (5 mL) was stirred at 110 ℃ for 1 h, then it was poured into ice-water and the mixture was neutralized with K2CO3 to pH 7-8. The mixture was extracted with EtOAc, then the organic layer was washed with brine, dried over Na2SO4, concentrated under vacuum to give the desired product (1.2 g, 75%) as a yellow solid, which was used for the next step without further purification. MS (ESI) m/e [M+1] + 257.0
Step B: 5-amino-1- (2-nitrobenzyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A reaction mixture of 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (1.2 g, 4.68 mmol) , 1- (bromomethyl) -2-nitrobenzene (1.01 g, 4.68 mmol) and K2CO3 (1.3 g, 9.36 mmol) in DMF (10 mL) was stirred at room temperature for 16h, then it was poured into water and extracted with EtOAc. The organic layer was washed with brine, dried over Na2SO4, concentrated under vacuum. The residue was purified by silica gel chromatography (elution with hexane/ethyl acetate 1: 2 to MeOH/DCM 1: 50) to the desired product (1 g, 55%) as a yellow solid. MS (ESI) m/e [M+1] + 392
Step C: 5-amino-1- (2-aminobenzyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A reaction mixture of 5-amino-1- (2-nitrobenzyl) -3- (1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazole-4-carboxamide (1 g, 2.55 mmol) , Fe power (0.86 g, 15.3 mmol) , MH4Cl (95 mg, 1.785 mmol) in EtOH (45 mL) and H2O (15 mL) was stirred at 80 ℃ for 3 h, then it was
poured into water and extracted with EtOAc. The organic layer was washed with brine, dried over Na2SO4, concentrated under vacuum. The residue was purified by silica gel chromatography (elution with hexane/ethyl acetate 1: 2 to MeOH/DCM 1: 50) to give the desired product (0.41 g, 45%) as a yellow solid. MS (ESI) m/e [M+1] + 362.
Step D: 1- (2-acrylamidobenzyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of 5-amino-1- (2-aminobenzyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (0.41 g, 1.13 mmol) , NaHCO3 (0.19 g, 2.26 mmol) in CH3CN (18 mL) and H2O (4 mL) was added a solution of arcyloyl chloride (0.113 g, 1.25 mmol) in CH3CN (2 mL) , then the reaction mixture was stirred at room temperature for 1 h. The solvent was removed under vacuum and the residue was partitioned between water and DCM. The organic layer was washed with brine, dried over Na2SO4, concentrated under vacuum. The residue was purified by prep-HPLC to afford the desired product (0.34 g, 72%) as a white solid. 1H NMR (DMSO-d6) δ 10.20 (s, 1H) , 7.70 (d, 1H, J=8 Hz ) , 7.30 (t, 1H, J=7.6 Hz) , 7.13 (t, 1H, J=7.6 Hz) , 7.07 (s, 5H) , 6.66 (s, 2H) , 6.54-6.47 (dd, 1H, J=10.4 Hz) , 6.35 (s, 2H) , 6.28-6.32 (dd, 1H, J=1.6 Hz) , 5.77-5.80 (dd, 1H, J=1.6 Hz) , 5.13 (s, 2H) , 3.42 (m, 1H) , 2.77-3.04 (m, 4H) , 2.13-2.16 (m, 1H) and 1.69-1.73 (m, 1H) . MS (ESI) m/e [M+1] + 416. The separation conditions are shown below: instrument: Gilson-281, column size: 21.2×150 5 μm Gemini-new, flow rate: 20 mL/min, UV: 214 nm. Method: 0.1% TFA in water, CH3CN from 42 to 50, in 11 min, then from 50 to 90 in 3 min, 90 hold on 3 min, then balance 2 min. Total run time: 20 min. Single gradient method.
Compound 1.20 was separated into two enantiomeric stereoisomers compound 1.20a (peak 1, R or S, earlier peak, retention time at 6.59 min in chiral analysis) , and compound 1.20b (peak 2, S or R, later peak, retention time at 10.46 min in chiral analysis) by chiral prep-HPLC.
The chiral separation conditions are shown below.
The chiral analysis conditions are shown below.
Compound 1.21: 1- (3-acrylamidophenyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: 5-Amino-1- (3-nitrophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
To a solution of 2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile (the product of step E in synthesis of Compound 1.14, 10g, 42mmol) in EtOH (50 ml) was added (3-nitrophenyl) hydrazine hydrochloride (9.6 g, 50.4 mmol) and Et3N (13g, 126mmol) . The mixture was stirred at 90℃ for 6h under N2. After cooling to RT, the solvent was removed in vacuo. Then dissolved in H2O (50 ml) , extracted with EtOAc (50 ml × 3) , dried over with Na2SO4, filtered and concentrated to give crude product which was further purified by chromatography column on silica (200g) , eluting with EtOAc: PE: Et3N=1: 4: 0.001 to give the product (2.8g, 19%) as a brown solid. MS (ESI) m/e [M+1] + 360.
Step B: 5-Amino-1- (3-nitrophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A solution of 5-amino-1- (3-nitrophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile (2.8 g, 7.8mmol) in MeSO3H (50 ml) was stirred at 85 ℃ for 40mins under N2. LC/MS showed the reaction was completed. Then mixture was poured into ice-water, basified by NaOH to pH=10 and extracted with EtOAc (100 ml × 3) . The organic layer was dried over with Na2SO4, filtered and concentrated to give the product (2g, 69%) as brown oil, which was used next step without further purification. MS (ESI) m/e [M+1] +378.
Step C: 5-amino-1- (3-aminophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a solution of 5-amino-1- (3-nitrophenyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (2g, 5.3mmol) in EtOH (50 ml) and H2O (10 ml) was added iron powder (1.5g, 26.5mmol) and NH4Cl (843 mg, 15.9mmol) . The mixture was stirred at 90 ℃ for 1h. The solid was filtered and the filtrate was concentrated to give crude product. To the crude product extracted with H2O (50 ml) and EtOAc (50 ml × 3) . The organic layer was dried over with Na2SO4, filtered and concentrated to give the crude product (1.5g, 83%) as a brown solid, which was used next step without further purification. MS (ESI) m/e [M+1] +348.
Step D: 1- (3-acrylamidophenyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a solution of 5-amino-1- (3-aminophenyl) -3- (1, 2, 3, 4-tetrahydrona phthalen-2-yl) -1H-pyrazole-4-carboxamide (1.5 g, 4.3 mmol) in CH3CN (20 ml) and H2O (5 ml) was added NaHCO3 (1.1 g, 12.9 mmol) and acryloyl chloride (391 mg, 4.3 mmol) at 0 ℃. The mixture was stirred for 10mins at 0 ℃ and was quenched with water (20 mL) , extracted with EtOAc (20 ml ×3) . The organic layers were dried over with Na2SO4, filtered and concentrated to give the crude product which was further purified by prep-HPLC to give the product (781.02 mg, 45%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ10.37 (s, 1H) , 7.87-7.79 (m, 1H) , 7.69-7.73 (m, 1H) , 7.43-7.48 (m, 1H) , 7.24-7.28 (m, 1H) , 7.06-7.12 (m, 3H) , 6.79 (s, 2H) , 6.26-6.49 (m, 4H) , 5.77-5.81 (m, 1H) , 3.43-3.49 (m, 1H) , 2.81-3.08 (m, 4H) , 2.20-2.24 (m, 1H) and 1.73-1.78 (m, 1H) . MS (ESI) m/e [M+1] +402.
Compound 1.22: 1- ( ( (R) -4-acryloylmorpholin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A solution of the product of step F in synthesis of Compound 1.14 (2.3g, 8.8 mmol) in MsOH (10 mL) was stirred at 70 ℃ for 6 hrs. The resulting solution was poured into water, neutralized by 5N NaOH aqueous solution till pH=8, then extracted with EA (50 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated to get the crude product (3.3 g) as a white solid. The solid was recrystallized by DCM (10 mL) to get desired product (2.3 g, 100%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 11.60 (br. s, 1H) , 7.27–6.97 (m, 4H) , 6.71 (br. s, 2H) , 5.48 (br. s, 2H) , 3.450-3.40 (m, 1H) , 3.13-2.70 (m, 4H) , 2.15-2.00 (m, 1H) , 1.90-1.70 (m, 1H) ppm. MS: M/e 257 (M+1) +
Step B: (R) -tert-butyl 2- ( (tosyloxy) methyl) morpholine-4-carboxylate
A mixture of the (R) -tert-butyl 2- (hydroxymethyl) morpholine-4-carboxylate (2.0 g, 9.21 mmol) , DMAP (114 mg, 0.92 mmol) , Tosyl chloride (TsCl, 1.93 g, 10.13 mmol) and Et3N (2.65 mL, 18.42 mmol) in DCM (20 mL) was stirred at rt for 2 h. The resulting solution was washed by water, extracted with DCM (10 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with PE: EA=2: 1 to get the desired product (2.62g, 77%) as a white solid. 1H NMR (400 MHz, CDCl3) δ 7.80 (d, J=8.4 Hz, 2H) , 7.35 (d, J=8.4 Hz, 2H) , 4.10–3.94 (m, 2H) , 3.94–3.72 (m, 3H) , 3.65-3.55 (m, 1H) , 3.53–3.38 (m, 1H) , 3.01–2.80 (m, 1H) , 2.69-2.61 (m, 1H) , 2.45 (s, 3H) , 1.45 (s, 9H) ppm. MS: M/e 372 (M+1) +
Step C: (2R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) morpholine-4-carboxylate
A mixture of the product of Step A (200 mg, 0.78 mmol) , the product of Step B (348 mg, 0.94 mmol) and Cs2CO3 (509 mg, 1.56 mmol) in DMF (10 mL) was stirred at 70 ℃ for 4 h. The resulting solution was concentrated. The residue was washed by water, extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with EA to get the desired product (219 mg, 62%) as yellow oil. MS: M/e 456 (M+1) +
Step D: 5-amino-1- ( (R) -morpholin-2-ylmethyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step C (219 mg, 0.48 mmol) in DCM (2 mL) was added TFA (2 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (171 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 356 (M+1) +
Step E: 1- ( ( (R) -4-acryloylmorpholin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step D (171 mg, 0.48 mmol) and NaHCO3 (242 mg, 32.88 mmol) in CH3CN/H2O (4 mL/4 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (43 mg, 0.48 mmol) was added dropwise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over anhydrous sodium sulfate then concentrated and purified by silica gel column chromatography eluting with DCM: MeOH=20: 1 to get the desired product (51 mg, 26%) as a white solid. 1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.10-7.00 (m, 4H) , 6.66 (dd, J=16.8, 10.6 Hz, 1H) , 6.37 (s, 2H) , 6.07 (dd, J=16.8, 2.0 Hz, 1H) , 5.94 (br. s, 2H) , 5.64 (dd, J=10.6, 2.0 Hz, 1H) , 4.20-3.85 (m, 5H) , 3.75-3.65 (m, 1H) , 3.48–3.27 (m, 2H) , 3.04–2.71 (m, 6H) , 2.20-2.05 (m, 1H) , 1.81-1.75 (m, 1H) ppm. MS: M/e 410 (M+1) +
Compounds 1.23-1.31 were prepared according to the procedures described for Compound 1.22 under appropriate conditions that could be recognized by one skilled in the art. Compound 1.23: 1- ( ( (S) -4-acryloylmorpholin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.12–6.99 (m, 4H) , 6.66 (dd, J=16.8, 10.6 Hz, 1H) , 6.37 (s, 2H) , 6.07 (dd, J=16.8, 2.2 Hz, 1H) , 5.93 (s, 2H) , 5.64 (dd, J=10.6, 2.2 Hz, 1H) , 4.22–3.80 (m, 5H) , 3.77–3.64 (m, 1H) , 3.47–3.29 (m, 2H) , 3.01–2.70 (m, 6H) , 2.20–2.07 (m, 1H) , 1.85–1.68 (m, 1H) ppm. MS: M/e 410 (M+1) +
Compound 1.24: 1- ( ( (S) -1-acryloylazetidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.15–6.93 (m, 4H) , 6.37 (s, 2H) , 6.17–5.79 (m, 4H) , 5.69–5.41 (m, 1H) , 4.81–4.52 (m, 1H) , 4.37–4.12 (m, 2H) , 4.05–3.69 (m, 2H) , 3.47–3.24 (m, 1H) , 3.02–2.70 (m, 4H) , 2.41–2.21 (m, 1H) , 2.19–1.95 (m, 2H) , 1.87–1.64 (m, 1H) ppm. MS: M/e 380 (M+1) +
Compound 1.25: 1- ( ( (R) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.17–6.93 (m, 4H) , 6.66–6.42 (m, 1H) , 6.35 (s, 2H) , 6.16 (d, J=17.2 Hz, 1H) , 5.99 (s, 2H) , 5.78–5.35 (m, 1H) , 4.48–4.14 (m, 1H) , 4.14–3.97 (m, 1H) , 3.99–3.78 (m, 1H) , 3.64–3.24 (m, 3H) , 3.04–2.71 (m, 4H) , 2.23–2.02 (m, 1H) , 1.98–1.64 (m, 5H) ppm. MS: M/e 394 (M+1) +
Compound 1.26: 1- ( ( (S) -1-acryloylpyrrolidin-3-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.18–6.93 (m, 4H) , 6.60–6.40 (m, 1H) , 6.34 (s, 2H) , 6.08-6.03 (m, 3H) , 5.62 (d, J=10.0 Hz, 1H) , 3.95–3.79 (m, 2H) , 3.67–3.08 (m, 5H) , 3.04–2.52 (m, 5H) , 2.21–2.05 (m, 1H) , 2.01–1.40 (m, 3H) ppm. MS: M/e 394 (M+1) +
Compound 1.27: 1- ( ( (R) -1-acryloylpyrrolidin-3-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.18–6.93 (m, 4H) , 6.60–6.40 (m, 1H) , 6.34 (s, 2H) , 6.10-6.03 (s, 2H) , 5.60 (d, J=10.0 Hz, 1H) , 3.95–3.74 (m, 2H) , 3.67–3.08 (m, 5H) , 3.04–2.50 (m, 5H) , 2.28–2.05 (m, 1H) , 2.01–1.50 (m, 3H) ppm. MS: M/e 394 (M+1) +
Compound 1.28: 1- ( (1-acryloylazetidin-3-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6) δ 7.15–6.98 (m, 4H) , 6.35 (s, 2H) , 6.29–6.16 (m, 1H) , 6.13–5.97 (m, 3H) , 5.60 (d, J=10.4 Hz, 1H) , 4.31–3.63 (m, 6H) , 3.42–3.27 (m, 1H) , 3.05–2.68 (m, 5H) , 2.17–2.03 (m, 1H) , 1.86–1.67 (m, 1H) ppm. MS: M/e 380 (M+1) +
Compound 1.29: 1- (1-acryloylazetidin-3-yl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6) δ 7.20–6.99 (m, 4H) , 6.72 (s, 2H) , 6.47–6.31 (m, 1H) , 6.26 (s, 2H) , 6.13 (d, J=16.8 Hz, 1H) , 5.69 (d, J=10.4 Hz, 1H) , 5.25–5.06 (m, 1H) , 4.59-4.55 (m, 1H) , 4.50-4.40 (m, 1H) , 4.37–4.12 (m, 2H) , 3.50–3.35 (m, 1H) , 3.11–2.68 (m, 4H) , 2.25–2.07 (m, 1H) , 1.86–1.62 (m, 1H) ppm. MS: M/e 366 (M+1) +
Compound 1.30: 1- ( ( (R) -1-acryloylpiperidin-3-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.85–6.51 (m, 3H) , 6.20 (s, 2H) , 6.10–5.98 (m, 1H) , 5.60 (dd, J=27.6, 10.0 Hz, 1H) , 4.29–4.02 (m, 1H) , 3.95–3.72 (m, 3H) , 3.47–3.35 (m, 2H) , 3.04–2.73 (m, 5H) , 2.13 (d, J=11.8 Hz, 1H) , 2.00–1.59 (m, 4H) , 1.40–1.08 (m, 2H) ppm. MS: M/e 408 (M+1) +
Compound 1.31: 1- ( ( (S) -1-acryloylpiperidin-3-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.89–6.47 (m, 3H) , 6.20 (s, 2H) , 6.03 (d, J=16.4 Hz, 1H) , 5.60 (dd, J=27.6, 10.8 Hz, 1H) , 4.30–4.02 (m, 1H) , 3.95–3.68 (m, 3H) , 3.45–3.34 (m, 2H) , 3.06–2.72 (m, 5H) , 2.17-2.07 (m, 1H) , 1.99–1.56 (m, 4H) , 1.39–1.08 (m, 2H) ppm. MS: M/e 408 (M+1) +
Compound 1.32: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (chroman-3-yl) -1H-pyrazole-4-carboxamide
Compound 1.32 was prepared according to the procedures described for Compound 1.19 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.05-7.08 (m, 2H) , 6.74-6.83 (m, 2H) , 6.48-6.50 (m, 3H) , 5.96-6.18 (m, 3H) , 5.48-5.68 (m, 1H) , 4.37-4.41 (m, 1H) , 3.90-4.21 (m, 4H) , 3.47-3.66 (m, 3H) , 2.98-3.02 (m, 2H) , 1.81-1.82 (m, 4H) . MS (ESI) m/e [M+1] + 396.
Compound 1.33: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Compound 1.33 was prepared according to the procedures described for Compound 1.10 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 7.19-7.21 (dd, J=2.0 Hz, 1H) , 7.05-7.12 (m, 2H) , 6.25-6.61 (m, 3H) , 6.07-6.14 (m, 1H) , 5.99 (s, 2H) , 5.44-5.67 (m, 1H) , 4.16-4.36 (m, 1H) , 3.85-4.08 (m, 2H) , 3.31-3.47 (m, 3H) , 2.97-3.05 (m, 2H) , 2.85-2.90 (m, 1H) , 2.75-2.80 (m, 1H) , 2.17-2.20 (m, 1H) , 1.74-1.86 (m, 5H) . MS (ESI) m/e [M+1] + 428.
Compound 1.33 was separated into two enantiomeric stereoisomers compound 1.33a (peak 1, R or S, earlier peak, retention time at 4.68 min in chiral analysis) , and compound 1.33b (peak 2, S or R, later peak, retention time at 5.30 min in chiral analysis) by chiral prep-HPLC.
The separation conditions are shown below:
The chiral analysis conditions are shown below.
Compounds 1.34-1.36 were prepared according to the procedures described for Compound 1.7 under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.34
1H NMR (400 MHz, DMSO-d6) δ 6.90 (br. s, 2H) , 6.83–6.76 (m, 1H) , 6.64–6.48 (m, 4H) , 6.30–6.16 (m, 2H) , 5.75–5.71 (m, 1H) , 5.35–5.31 (m, 1H) , 4.26–4.20 (m, 1H) , 4.11–4.05
(m, 1H) , 3.97–3.92 (m, 1H) , 3.70–3.38 (m, 4H) , 2.96–2.91 (m, 3H) , 1.96–1.75 (m, 4H) ppm. MS: M/e 429 (M+1) +
Compound 1.35
1H NMR (400 MHz, DMSO-d6) δ 6.90-6.56 (m, 7H) , 6.31–6.16 (m, 2H) , 5.75–5.71 (m, 1H) , 5.20–5.16 (m, 1H) , 4.28–4.18 (m, 1H) , 4.12–3.90 (m, 2H) , 3.65–3.28 (m, 4H) , 2.91 (s, 3H) , 2.01–1.75 (m, 4H) ppm. MS: M/e 429 (M+1) +
Compound 1.36
1H NMR (400 MHz, DMSO-d6, 80 ℃) δ 6.80–5.89 (m, 9H) , 5.80–5.40 (s, 1H) , 5.34 (dd, J=8.0, 2.8 Hz, 1H) , 4.50–3.80 (m, 3H) , 3.65–3.30 (m, 4H) , 2.87 (s, 3H) , 1.95–1.75 (m, 4H) , ppm. MS: M/e 429 (M+1) +.
Compounds 1.37-1.45 were prepared according to the procedures described for Compound 1.10 under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.37
1H NMR (400 MHz, DMSO-d6) δ 7.17–7.05 (m, 1H) , 6.97–6.84 (m, 2H) , 6.70–6.54 (m, 3H) , 6.27–5.95 (m, 3H) , 5.79–5.41 (m, 1H) , 4.42–3.87 (m, 4H) , 3.84–3.75-3.62 (m, 2H) , 3.51–3.23 (m, 4H) , 3.04–2.72 (m, 4H) , 2.19–1.98 (m, 2H) , 1.96–1.62 (m, 2H) . MS: M/e 442 (M+1) +
Compound 1.38
1H NMR (400 MHz, DMSO-d6) δ 7.15–7.02 (m, , 4H) , 6.71–6.53 (m, 2H) , 6.28–5.98 (m, 3H) , 5.79–5.42 (m, 1H) , 4.44–3.87 (m, 4H) , 3.81–3.65 (m, 2H) , 3.48–3.40–3.35 (m, 1H) , 3.30–3.25 (m, 3H) , 3.05–2.73 (m, 4H) , 2.20–1.97 (m, 2H) , 1.96–1.62 (m, 2H) . MS: M/e 424 (M+1) +
Compound 1.39
1H NMR (400 MHz, DMSO-d6) δ 7.19–7.06 (m, 1H) , 6.99–6.87 (m, 2H) , 6.69–6.50 (m, 3H) , 6.27–5.98 (m, 3H) , 5.77–5.43 (m, 1H) , 4.48–4.20 (m, 1H) , 4.16–3.85 (m, 2H) , 3.79 –3.60 (m, 1H) , 3.57–3.38 (m, 3H) , 3.23–3.12 (m, 3H) , 3.04–2.75 (m, 4H) , 2.14–2.04 (m, 1H) , 1.98–1.90 (m, 1H) , 1.90–1.63 (m, 2H) . MS: M/e 442 (M+1) +
Compound 1.40
1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.74–6.45 (m, 3H) , 6.25–5.98 (m, 3H) , 5.78–5.41 (m, 1H) , 4.52–4.22 (m, 1H) , 4.15–3.85 (m, 2H) , 3.79–3.60 (m, 1H) , 3.58–3.36 (m, 3H) , 3.22–3.14 (m, 3H) , 3.06–2.74 (m, 4H) , 2.17–2.03 (m, 1H) , 2.01–1.82 (m, 2H) , 1.78–1.63 (m, 1H) . MS: M/e 424 (M+1) +
Compound 1.40a: 1- ( ( (2S, 4R) -1-acryloyl-4-methoxypyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Compound 1.40a was prepared according to the procedures described for chiral synthesis of Compound 1.14a under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.66–6.49 (m, 3H) , 6.25–5.98 (m, 3H) , 5.75–5.43 (m, 1H) , 4.48–4.21 (m, 1H) , 4.13–3.85 (m, 2H) , 3.80–3.60 (m, 1H) , 3.58–3.35 (m, 3H) , 3.22–3.14 (m, 3H) , 3.06–2.74 (m, 4H) , 2.16–2.04 (m, 1H) , 2.02–1.83 (m, 2H) , 1.78–1.66 (m, 1H) . MS: M/e 424 (M+1) +
Compound 1.41
1H NMR (400 MHz, DMSO-d6) δ 7.09 (d, J=6.0 Hz, 1H) , 6.95–6.75 (m, 2H) , 6.60–6.25 (m, 3H) , 6.25–6.04 (m, 1H) , 5.90 (s, 2H) , 5.79–5.43 (m, 1H) , 4.76–4.40 (m, 1H) , 4.23–3.95 (m, 3H) , 3.78 (s, 1H) , 3.46–3.23 (m, 1H) , 3.02–2.54 (m, 5H) , 2.47–2.29 (m, 1H) , 2.18–1.99 (m, 1H) , 1.86–1.65 (m, 1H) ppm. MS: M/e 448 (M+1) +
Compound 1.42: 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A solution of 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile (2.1 g, 8.8 mmol) in methanesulfonic acid (10 mL) was stirred at 70 ℃ for 4 hrs. The resulting solution was poured into water, neutralized by 5N NaOH aqueous solution till pH=8, then extracted with EA (50 mL x 3) . The combined organic layers were dried over sodium sulfate anhydrous and concentrated to get 3.3 g white solid, which was recrystallized by DCM to get desired product (2.3g, 99%) as a white solid. MS: M/e 257 (M+1) +
Step A: (S) -1-tert-butyl 2-methyl 4, 4-difluoropyrrolidine-1, 2-dicarboxylate
To a stirred solution of (S) -1-tert-butyl 2-methyl4-oxopyrrolidine-1, 2-dicarboxylate (5 g, 20.55 mmol) in dry DCM (100 mL) at-78 ℃ was added diethylaminosulfur trifluoride (DAST, 8.5 mL, 61.66 mol) dropwise over a period of 30 minutes under nitrogen atmosphere. The reaction mixture was stirred at this temperature for 1 h then at room temperature for 16 h. The reaction mixture was poured into the mixture of crushed ice and saturated NaHCO3 aqueous solution till pH =8. The two layers were separated and the aqueous layer was extracted with DCM (20 mL×3) . The combined organic layer was washed with brine, dried over anhydrous Na2SO4 then concentrated to get crude product (4.7 g, yellow oil) which was used in next step directly. MS: M/e 210 (M-55) +.
Step B: (S) -tert-butyl 4, 4-difluoro-2- (hydroxymethyl) pyrrolidine-1-carboxylate
To the solution of the product of Step A (4.7 g, 17.72 mmol) in THF (20 mL) was added NaBH4 (1.88 g, 44.30 mmol) followed by LiCl (1.48 g, 38.98 mmol) . The mixture solution was cooled to 0 ℃, EtOH (30 mL) was added dropwise. The final solution was stirred at rt for 15 hrs.
And then the solution was cooled to 0 ℃, neutralized by 4N HCl till pH=4, then concentrated. The residue was washed by water, extracted with DCM (50 mL×3) . The combined organic layers were dried over anhydrous Na2SO4 and concentrated to get crude product (3.7 g, 88%) as yellow oil, which was used in next step directly. MS: M/e 182 (M-55) +.
Step C: (S) -tert-butyl 4, 4-difluoro-2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate
A mixture of the product of Step B (3.7 g, 15.6 mmol) , TsCl (3.27 g, 17.2 mmol) , DMAP (193 mg, 1.56 mmol) and Et3N (4.5 mL, 31.2 mmol) in DCM (15 mL) was stirred at RT for 4 hrs. The resulting solution was washed by water, extracted with DCM (20 mL×3) . The combined organic layers were dried over Na2SO4, concentrated and purified by silica gel column chromatography eluting with PE: EA=5: 1 to get the desired product (5.2 g, 85%) as yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.77 (d, J=7.8 Hz, 2H) , 7.36 (d, J=7.8 Hz, 2H) , 4.33–3.92 (m, 3H) , 3.89–3.67 (m, 1H) , 3.64–3.41 (m, 1H) , 2.58–2.24 (m, 5H) , 1.47 (s, 9H) ppm. MS: M/e 292 (M-100+1) +
Step D: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) -4, 4-difluoropyrrolidine-1-carboxylate
A mixture of the product of Step C (4.58 g, 11.7 mmol) , 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (2.0 g, 7.8 mmol) and Cs2CO3 (5.08 g, 15.6 mmol) in DMF (20 mL) was stirred at 70 ℃ for 15 hrs. The resulting solution was
concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with EA to get the desired product (1.8 g, 49%) as yellow oil. 1H NMR (400 MHz, DMSO-d6) δ 7.17–6.98 (m, 4H) , 6.61 (s, 2H) , 6.10 (s, 2H) , 4.41–4.18 (m, 1H) , 4.13–3.95 (m, 2H) , 3.89–3.65 (m, 1H) , 3.55–3.34 (m, 2H) , 3.09–2.70 (m, 4H) , 2.43–2.24 (m, 1H) , 2.20–2.05 (m, 1H) , 1.81–1.59 (m, 1H) , 1.40 (s, 9H) ppm. MS: M/e 476 (M+1) +
Step E: 5-amino-1- ( ( (S) -4, 4-difluoropyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of step D (414 mg, 0.87 mmol) in DCM (3 mL) was added TFA (2 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (326 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 376 (M+1) +
Step F: 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step E (326 mg, 0.86 mmol) and NaHCO3 (289 mg, 3.44 mmol) in CH3CN/H2O (8 mL/8 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (78 mg, 0.86 mmol) in CH3CN (1 mL) was added dropwise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE/EA=1/1 to get the desired product (200 mg, 54%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.17–6.89 (m, 4H) , 6.52–6.27 (m, 3H) , 6.25–6.04 (m, 1H) , 5.95 (s, 2H) , 5.78–5.46 (m, 1H) , 4.71–4.41 (m, 1H) , 4.24–3.91 (m, 3H) , 3.89–3.62 (m, 1H) , 3.44–3.23 (m, 1H) , 3.01–2.70 (m, 4H) , 2.70–2.52 (m, 1H) , 2.44–2.28 (m, 1H) , 2.21–2.01 (m, 1H) , 1.87–1.65 (m, 1H) ppm. MS: M/e 430 (M+1) +
Compound 1.42a or 1.42b: (R or S) 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin -2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbox amide
Step A: (R or S) (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphth alen-2-yl) -1H-pyrazol-1-yl) methyl) -4, 4-difluoropyrrolidine-1-carboxylate
A mixture of the (S) -tert-butyl 4, 4-difluoro-2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate (4.58 g, 11.7 mmol) , 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (2.0 g, 7.8 mmol) and Cs2CO3 (5.08 g, 15.6 mmol) in DMF (20 mL) was stirred at 70 ℃ for 15 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with EA to get the desired product (1.4 g, 38%) as yellow oil, which was separated by chiral HPLC to give peak 1 (600 mg, earlier peak) and peak 2 (600 mg, later peak) .
The chiral separation conditions are shown below:
Step B: (R or S) 5-amino-1- ( ( (S) -4, 4-difluoropyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step A (600 mg, 1.26 mmol) in DCM (5 mL) was added TFA (5 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (473 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 376 (M+1) +
Step C: (R or S) 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3-(1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of Step B (473 mg, 1.26 mmol) and NaHCO3 (423 mg, 5.04 mmol) in CH3CN/H2O (12 mL/12 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (113 mg, 1.26 mmol) in CH3CN (1 mL) was added drop wise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE/EA=1/1 to get the desired product (372 mg, 69%) as a white solid. Peak 1 (Compound 1.42a, retention time: 5.391 min) : 1H NMR (400 MHz,DMSO-d6) δ 7.18–6.96 (m, 4H) , 6.58–6.27 (m, 3H) , 6.26–6.07 (m, 1H) , 5.97 (s, 2H) , 5.82–5.46 (m, 1H) , 4.73–4.44 (m, 1H) , 4.22–3.96 (m, 3H) , 3.90–3.64 (m, 1H) , 3.47–3.25 (m, 1H) , 3.00–2.73 (m, 4H) , 2.68–2.54 (m, 1H) , 2.45–2.35 (m, 1H) , 2.19–2.01 (m, 1H) , 1.86–1.67 (m, 1H) ppm. MS: M/e 430 (M+1) + ee: 100%. Peak 2 (Compound 1.42b, retention time: 6.044 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.20–6.93 (m, 4H) , 6.55–6.29 (m, 3H) , 6.25–6.05 (m, 1H) , 5.97 (s, 2H) , 5.76–5.31 (m, 1H) , 4.80–4.38 (m, 1H) , 4.23–3.92 (m, 3H) , 3.91–3.61 (m, 1H) , 3.47–3.22 (m, 1H) , 3.01–2.70 (m, 4H) , 2.64–2.53 (m, 1H) , 2.43–2.27 (m, 1H) , 2.23–2.00 (m, 1H) , 1.91–1.67 (m, 1H) ppm. MS: M/e 430 (M+1) + . ee: 100%.
The chiral analysis conditions are shown below.
Compound 1.42a: 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1,2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) methyl) -4, 4-difluoropyrrolidine-1-carboxylate
A mixture of (S) -tert-butyl 4, 4-difluoro-2- ( (tosyloxy) methyl) pyrrolidine -1-carboxylate (229 mg, 0.58 mmol) , (R) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (100 mg, 0.39 mmol) and Cs2CO3 (254 mg, 0.78 mmol) in DMF (10 mL) was stirred at 70 ℃ for 15 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with EA to get the desired product (100 mg, 54%) as yellow oil. MS: M/e 476 (M+1) +
Step B: 5-amino-1- ( ( (S) -4, 4-difluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step A (100 mg, 0.21 mmol) in DCM (2 mL) was added TFA (2 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (79 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 376 (M+1) +
Step C: 1- ( ( (S) -1-acryloyl-4, 4-difluoropyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of Step B (79 mg, 0.21 mmol) and NaHCO3 (70 mg, 0.84 mmol) in CH3CN/H2O (2 mL/2 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (19 mg, 0.21 mmol) was added drop wise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE/EA=1/1 to get the desired product (45 mg, 50%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.18–6.96 (m, 4H) , 6.58–6.27 (m, 3H) , 6.26–6.07 (m, 1H) , 5.97 (s, 2H) , 5.82–5.46 (m, 1H) , 4.73–4.44 (m, 1H) , 4.22–3.96 (m, 3H) , 3.90–3.64 (m, 1H) , 3.47–3.25 (m, 1H) , 3.00–2.73 (m, 4H) , 2.68–2.54 (m, 1H) , 2.45–2.35 (m, 1H) , 2.19–2.01 (m, 1H) , 1.86–1.67 (m, 1H) ppm. MS: M/e 430 (M+1) + . ee: 100%.
Compound 1.43: 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (2S, 4R) -1-tert-butyl 2-methyl 4-fluoropyrrolidine-1, 2-dicarboxylate
To a stirred solution of (2S, 4S) -1-tert-butyl 2-methyl 4-hydroxypyrrolidine -1, 2-dicarboxylate (10 g, 40.77 mmol) in dry DCM (100 mL) cooled to -78 ℃ was addeddiethylaminosulfur trifluoride (9.5 mL, 77.47 mol) dropwise over a period of 30 minutes. The reaction mixture was stirred at this temperature for 1 h then at room temperature for 16 h. The reaction mixture was poured into the mixture of crushed ice and saturated NaHCO3 aqueous solution till pH=8. The two layers were separated and the aqueous layer was extracted with DCM (50 mL×3) . The combined organic layer was washed with brine, dried over anhydrous Na2SO4 then concentrated to get crude product (10 g, yellow oil) which was used in next step directly. MS: M/e 148 (M-100+1) +.
Step B: (2S, 4R) -tert-butyl 4-fluoro-2- (hydroxymethyl) pyrrolidine-1-carboxylate
To the solution of the product of Step A (10 g, 40.44 mmol) in THF (100 mL) was added NaBH4 (4.3 g, 101.10 mmol) followed by LiCl (3.3 g, 88.98 mmol) . The mixture solution was cooled to 0 ℃, EtOH (100 mL) was added dropwise. The final solution was stirred at rt for 15 hrs.
And then the solution was cooled to 0 ℃, neutralized by 4N HCl till pH=4, then concentrated. The residue was washed by water, extracted with DCM (50 mL×3) . The combined organic layers were dried over anhydrous Na2SO4 was concentrated to get crude product (8.86 g, yellow oil) which was used in next step directly. MS: M/e 164 (M-55) +.
Step C: (2S, 4R) -tert-butyl 4-fluoro-2- ( (tosyloxy) methyl) pyrrolidine-1-carboxylate
A mixture of the product of Step B (8.86 g, 40. 44 mmol) , TsCl (8.48 g, 44.50 mmol) , DMAP (496 mg, 4 mmol) and Et3N (8.7 mL, 60.67 mmol) in DCM (40 mL) was stirred at RT for 4 hrs. The resulting solution was washed by water, extracted with DCM (20 mL×3) . The combined organic layers were dried over Na2SO4, concentrated and purified by silica gel column chromatography eluting with PE: EA=5: 1 to get the desired product (6.0 g, 40%of three steps) as yellow oil. MS: M/e 274 (M-100+1) +
Step D: (2S, 4R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazol-1-yl) methyl) -4-fluoropyrrolidine-1-carboxylate
A mixture of the product of Step C (3.26 g, 8.74 mmol) , 5-amino-3-(1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (1.6 g, 6.24 mmol) and Cs2CO3 (4.0 g, 12.48 mmol) in DMF (20 mL) was stirred at 70 ℃ for 15 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and
purified by silica gel column chromatography eluting with EA to get the desired product (800 mg, 28%) as yellow oil. MS: M/e 458 (M+1) +
Step E: 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of step D (525 mg, 1.14 mmol) in DCM (3 mL) was added TFA (2 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (410mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 358 (M+1) +
Step F: 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of step E (410 mg, 1.15 mmol) and NaHCO3 (386 mg, 4.6 mmol) in CH3CN/H2O (10 mL/10 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (103 mg, 1.15 mmol) was added drop wise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column
chromatography eluting with PE/EA=1/1 to get the desired product (240 mg, 51%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.13–6.98 (m, 4H) , 6.60–6.42 (m, 1H) , 6.36 (s, 2H) , 6.25–6.04 (m, 1H) , 5.93 (s, 2H) , 5.79–5.40 (m, 1H) , 5.32–4.97 (m, 1H) , 4.58–4.30 (m, 1H) , 4.30–3.65 (m, 3H) , 3.60–3.24 (m, 2H) , 3.01–2.62 (m, 4H) , 2.29–1.99 (m, 3H) , 1.87–1.68 (m, 1H) ppm. MS: M/e 412 (M+1) +
Compound 1.43a or 1.43b: (R or S) 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-car boxamide
Step A: (R or S) (2S, 4R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) -4-fluoropyrrolidine-1-carboxylate
A mixture of (2S, 4R) -tert-butyl 4-fluoro-2- ( (tosyloxy) methyl) pyrrolidine -1-carboxylate (3.26 g, 8.74 mmol) , 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -
1H-pyrazole-4-carboxamide (1.6 g, 6.24 mmol) and Cs2CO3 (4.0 g, 12.48 mmol) in DMF (20 mL) was stirred at 70 ℃ for 15 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with EA to get the desired product (1.2 g, 42%) as yellow oil, which was separated by chiral HPLC to give peak 1 (0.37 g, earlier peak) and peak 2 (0.37 g, later peak) . The chiral separation conditions are shown below:
Step B: (R or S) 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step B (370 mg, 0.81 mmol) in DCM (5 mL) was added TFA (5 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (291 mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 358 (M+1) +
Step C: (R or S) 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3-( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of Step B (291 mg, 0.81 mmol) and NaHCO3 (272 mg, 3.24 mmol) in CH3CN/H2O (7 mL/7 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (73 mg, 0.81 mmol) was added drop wise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE/EA=1/1 to get the desired product (213 mg, 64%) as a white solid. Peak 1 (Compound 1.43a, retention time: 5.456 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.22 –6.94 (m, 4H) , 6.64–6.44 (m, 1H) , 6.36 (s, 2H) , 6.22–6.06 (m, 1H) , 5.91 (s, 2H) , 5.79–5.44 (m, 1H) , 5.35–4.90 (m, 1H) , 4.64–4.31 (m, 1H) , 4.20–3.71 (m, 3H) , 3.54–3.26 (m, 2H) , 3.02–2.67 (m, 4H) , 2.34–1.97 (m, 3H) , 1.89–1.69 (m, 1H) ppm. MS: M/e 412 (M+1) + . ee: 100%. Peak 2 (Compound 1.43b, retention time: 6.985 min) : 1H NMR (400 MHz, DMSO-d6) δ 7.13–6.97 (m, 4H) , 6.59–6.43 (m, 1H) , 6.36 (s, 2H) , 6.23–6.05 (m, 1H) , 5.93 (s, 2H) , 5.77–5.46 (m, 1H) , 5.32 –4.99 (m, 1H) , 4.63–4.31 (m, 1H) , 4.28–3.66 (m, 3H) , 3.58–3.22 (m, 2H) , 3.00-2.69 (m, 4H) , 2.26-1.96 (m, 3H) , 1.89–1.69 (m, 1H) ppm. MS: M/e 412 (M+1) + . ee: 100%.
The chiral analysis conditions are shown below.
Compound 1.43a: 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (2S, 4R) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- ( (R) -1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazol-1-yl) methyl) -4-fluoropyrrolidine-1-carboxylate
A mixture of (2S, 4R) -tert-butyl 4-fluoro-2- ( (tosyloxy) methyl) pyrrolidine -1-carboxylate (219 mg, 0.58 mmol) , (R) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazole-4-carboxamide (100 mg, 0.39 mmol) and Cs2CO3 (254 mg, 0.78 mmol) in DMF (10 mL) was stirred at 70 ℃ for 15 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with EA to get the desired product (90 mg, 51%) as yellow oil. MS: M/e 458 (M+1) +
Step B: 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To the solution of the product of Step B (90 mg, 0.20 mmol) in DCM (2 mL) was added TFA (2 mL) . The solution was stirred at rt for 1 h. The resulting solution was concentrated to get the crude product (70mg, 100%) as yellow oil, which was used in next step directly. MS: M/e 358 (M+1) +
Step C: 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1,2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the product of Step B (70 mg, 0.20 mmol) and NaHCO3 (67 mg, 0.80 mmol) in CH3CN/H2O (2 mL/2 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (18 mg, 0.20 mmol) was added drop wise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE/EA=1/1 to get the desired product (30 mg, 37%) as a white solid. 1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.13–6.95 (m, 4H) , 6.62–6.43 (m, 1H) , 6.35 (s,
2H) , 6.22–6.06 (m, 1H) , 5.92 (s, 2H) , 5.78–5.39 (m, 1H) , 5.32–4.94 (m, 1H) , 4.61–4.32 (m, 1H) , 4.26–3.70 (m, 3H) , 3.57–3.22 (m, 2H) , 3.00–2.70 (m, 4H) , 2.27–1.97 (m, 3H) , 1.88–1.66 (m, 1H) ppm. MS: M/e 412 (M+1) + . ee: 100%.
The alternative route of Compound 1.43a: 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen -2-yl) -1H-pyrazole-4-carboxamide
Step A: 1- (tert-butyl) 2-methyl (2S, 4R) -4-fluoropyrrolidine-1, 2-dicarboxylate
The solution of 1- (tert-butyl) 2-methyl (2S, 4S) -4-hydroxypyrrolidine-1, 2-dicarboxylate (10 g, 40.77 mmol) in DCM (100 mL) was cooled to -78 ℃ and stirred for 5 mins. Then DAST (9.5 mL, 77.47 mmol) was added dropwise for about 10 mins. The final solution was stirred at -78 ℃ to rt for 48 h. The resulting solution was poured into ice-water with 2 g NaHCO3 and stirred for 15 mins, then extracted with DCM (50 mL x 3) . The combined organic layer was washed by brine,
dried over sodium sulfate anhydrous then concentrated to get the crude product (10 g ) as yellow oil which was used in the next step directly. MS: M/e 248 (M+1) +
Step B: tert-butyl (2S, 4R) -4-fluoro-2- (hydroxymethyl) pyrrolidine-1-carboxylate
To the solution of the crude product of Step A (10 g, 40 mmol) in THF (100 mL) was added NaBH4 (4.3 g, 100 mmol) followed by LiCl (3.3 g, 88 mmol) . The solution was cooled to 0 ℃ and EtOH (100 mL) was added dropwise. The final solution was stirred at 0 ℃ to rt for 15 hrs. The resulting solution was cooled to 0 ℃, 4 N HCl was added till pH=4, then concentrated. The residue was washed by water, extracted with DCM (50 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get the crude product (8.86 g, 100%) as yellow oil, which was used in next step directly. MS: M/e 220 (M+1) +
Step C: tert-butyl (2S, 4R) -4-fluoro-2-formylpyrrolidine-1-carboxylate
A solution of oxalyl chloride (4 mL, 47.43 mmol)in dry DCM (100 mL) was cooled to -78 ℃ . To the solution, DMSO (3.6 mL, 51.07 mmol) in DCM (10 mL) was added dropwise for about 30 min at -78 ℃ followed by the solution of the crude product of Step B (8 g, 36.48 mmol) in DCM (25 mL) , then triethylamine (20 mL, 145.92 mmol) was added. The final solution was stirred at -78 ℃ for 30 min, then at 0 ℃ for 1 h. The resulting solution was washed by water, extracted with DCM (50 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get the crude product (8 g, 100%) as yellow oil, which was used in next step directly. MS: M/e 218 (M+1) +
Step D: tert-butyl (2S, 4R) -2- ( (2- (tert-butoxycarbonyl) hydrazinyl) methyl) -4-fluoropyrrolidine-1-carboxylate
A mixture of the crude product of Step C (8 g, 36.82 mmol) and tert-butyl hydrazinecarboxylate (4.86 g, 36.82 mmol) in MeOH (10 mL) was stirred at rt for 2 hrs. Then the solution was cooled to 0 ℃, HOAc (10 mL) was added followed by NaBH3CN (2.36 g, 36.82 mmol) . The solution was stirred at 0 ℃ for another 1 h. The resulting solution was concentrated. The residue was dissolved in DCM (50 mL) , basified by 5N NaOH solution to pH=8, then washed by water, extracted with DCM (50 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get the crude product (8.5 g, 69%) as yellow oil, which was used in next step directly. MS: M/e 334 (M+1) +
Step E: (2S, 4R) -4-fluoro-2- (hydrazinylmethyl) pyrrolidine
To the solution of the crude product of step D (8.5 g, 25.49 mmol) in DCM (20 mL) was added TFA (10 mL) . The solution was stirred at rt for 2 h. The resulting solution was concentrated. The residue was dissolved in the mixed solvent of MeOH/DCM=1/20. To the solution was added K2CO3 till pH=8. The mixture solution was stirred for 30 min, filtered. The filtrate was concentrated to get the crude product (3.39g, 100%) as yellow oil, which was used in next step directly. MS: M/e 134 (M+1) +
Step F: 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A mixture of the crude product of step E (3.39 g, 25.45 mmol) and (R) -2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile (3 g, 12.72 mmol) in EtOH (5 mL) was stirred at rt for 4 hrs. The resulting solution was concentrated. The residue was washed by water, extracted with EA (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with EA to get the desired product (3.4 g, 79%) as yellow oil. MS: M/e 340 (M+1) + .
Step G: 5-amino-1- ( ( (2S, 4R) -4-fluoropyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
The solution of the product of step F (3.4 g, 10 mmol) in MsOH (15 mL) was stirred at 70 ℃ for 4 hrs. The resulting solution was cooled to rt, neutralized by 5 N NaOH aqueous solution till pH=8, then extracted with DCM (20 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated to get crude product (2.8 g, 80%) as yellow oil, which was used in next step directly. MS: M/e 358 (M+1) +
Step H: 1- ( ( (2S, 4R) -1-acryloyl-4-fluoropyrrolidin-2-yl) methyl) -5-amino-3-( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A mixture of the crude product of step G (2.8 g, 7.83 mmol) and NaHCO3 (1.3 g, 15.66 mmol) in CH3CN/H2O (20 mL/20 mL) was stirred at 0 ℃ for 5 min. Acryloyl chloride (705 mg, 7.83 mmol) was added drop wise at 0 ℃. The final solution was stirred at 0 ℃ for 5 min and quenched by water, then extracted with EA (10 mL x 3) . The combined organic layer was washed by brine, dried over sodium sulfate anhydrous then concentrated and purified by silica gel column chromatography eluting with PE/EA=1/1 to get the desired product (1.8 g, 56%) as a white solid. 1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.13–6.95 (m, 4H) , 6.62–6.43 (m, 1H) , 6.35 (s, 2H) , 6.22–6.06 (m, 1H) , 5.92 (s, 2H) , 5.78–5.39 (m, 1H) , 5.32–4.94 (m, 1H) , 4.61–4.32 (m, 1H) , 4.26–3.70 (m, 3H) , 3.57–3.22 (m, 2H) , 3.00–2.70 (m, 4H) , 2.27–1.97 (m, 3H) , 1.88–1.66 (m, 1H) ppm. MS: M/e 412 (M+1) + . ee: 100%.
Compound 1.44
1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.17–7.02 (m, 1H) , 6.95–6.77 (m, 2H) , 6.67–6.23 (m, 3H) , 6.21–5.80 (m, 3H) , 5.75–5.40 (m, 1H) , 5.30–4.98 (m, 1H) , 4.67–4.32 (m, 1H) , 4.27–3.68 (m, 3H) , 3.62–3.25 (m, 2H) , 3.01–2.70 (m, 4H) , 2.29–1.95 (m, 3H) , 1.87–1.57 (m, 1H) ppm. MS: M/e 430 (M+1) +
Compound 1.45
1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.13–6.86 (m, 4H) , 6.72–6.27 (m, 3H) , 6.26–5.59 (m, 4H) , 5.52–5.14 (m, 1H) , 4.73–3.46 (m, 5H) , 3.41–3.24 (m, 1H) , 3.04–2.68 (m, 4H) , 2.38–1.97 (m, 3H) , 1.91–1.66 (m, 1H) ppm. MS: M/e 412 (M+1) +
Compounds 1.46 -1.49 were prepared according to the procedures described for
Compound 1.20 under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.46
1H NMR (400 MHz, DMSO-d6) δ 10.37 (s, 1H) , 7.70-7.73 (dd, J=2.0, 11.2 Hz, 1H) , 7.21-7.25 (dd, J=7.2, 8.8 Hz, 1H) , 7.06-7.09 (m, 4H) , 6.99-7.02 (m, 1H) , 6.68 (s, 2H) , 6.49-6.55 (m, 1H) , 6.40 (s, 2H) , 6.30-6.35 (m, 1H) , 5.80-5.83 (m, 1H) , 5.14 (s, 2H) , 3.39-3.45 (m, 1H) ,2.98-3.03 (m, 1H) , 2.85-2.94 (m, 2H) , 2.77-2.82 (m, 1H) , 2.13-2.16 (m, 1H) , 1.67-1.76 (m, 1H) . MS (ESI) m/e [M+1] +434.
Compound 1.47
1H NMR (400 MHz, DMSO-d6) δ10.56 (s, 1H) , 7.74 (d, J=8.4 Hz, 1H) , 7.38 (dd, J=14.8, 8.2 Hz, 1H) , 7.16-6.94 (m, 5H) , 6.69 (s, 2H) , 6.51-6.45 (m, 1H) , 6.39-6.17 (m, 3H) , 5.81 (d, J=11.4 Hz, 1H) , 5.19 (t, J=16.8 Hz, 2H) , 3.42-3.40 (m, 1H) , 2.99 (dd, J=16.4, 4.0 Hz, 1H) , 2.94-2.68 (m, 3H) , 2.12 (d, J=10.6 Hz, 1H) , 1.70-1.63 (m, 1H) . (ESI) m/e [M+1] + 434.
Compound 1.48
1H NMR (400 MHz, DMSO-d6) δ10.12 (s, 1H) , 7.67 (dd, J=8.8, 5.5 Hz, 1H) , 7.15 (td, J=8.6, 3.0 Hz, 1H) , 7.07 (s, 4H) , 6.76 (dd, J=9.6, 2.9 Hz, 1H) , 6.69 (s, 2H) , 6.49 (dd, J=17.0, 10.2 Hz, 1H) , 6.36 (s, 2H) , 6.30 (dd, J=17.0, 1.7 Hz, 1H) , 5.80 (dd, J=10.2, 1.6 Hz, 1H) , 5.12 (s, 2H) , 3.51-3.38 (m, 1H) , 3.02 (dd, J=16.5, 3.9 Hz, 1H) , 2.97-2.84 (m, 2H) , 2.81 (dd, J=9.6, 6.8 Hz, 1H) , 2.14 (d, J=10.9 Hz, 1H) , 1.71–1.66 (m, 1H) . (ESI) m/e [M+1] + 434.
Compound 1.49
1H NMR (400 MHz, DMSO-d6) δ 9.96 (s, 1H) , 7.32–7.15 (m, 2H) , 7.07 (s, 4H) , 6.65 (s, 2H) , 6.58 (d, J=7.6 Hz, 1H) , 6.51 (dd, J=17.0, 10.2 Hz, 1H) , 6.31 (s, 1H) , 6.26 (s, 2H) , 5.81 (d, J=11.1 Hz, 1H) , 5.07 (s, 2H) , 3.40 (d, J=11.9 Hz, 1H) , 3.01 (dd, J=16.6, 4.3 Hz, 1H) , 2.96–2.68 (m, 3H) , 2.14 (d, J=11.2 Hz, 1H) , 1.72–1.66 (m, 1H) . (ESI) m/e [M+1] + 434.
Compound 1.50
1H NMR (400 MHz, DMSO-d6) δ10.29 (s, 1H) , 7.68-7.70 (d, J=11.2 Hz, 1H) , 7.24-7.26 (d, J=7.6 Hz, 1H) , 7.07-7.19 (m, 3H) , 6.96-7.01 (m, 1H) , 6.68 (s, 2H) , 6.49-6.56 (m, 1H) , 6.40 (s, 2H) , 6.30-6.35 (m, 1H) , 5.82-5.85 (m, 1H) , 5.13 (s, 2H) , 3.37-3.45 (m, 1H) , 3.01-3.06 (m, 1H) , 2.86-2.94 (m, 2H) , 2.67-2.79 (m, 1H) , 2.20-2.23 (m, 1H) , 1.70-1.75 (m, 1H) . MS (ESI) m/e [M+1] +468.
Compound 1.51: 1- (2-acrylamido-4-fluorobenzyl) -5-amino-3- (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: N- (5, 6, 7, 8-tetrahydronaphthalen-1-yl) acetamide
A solution of 5, 6, 7, 8-tetrahydronaphthalen-1-amine (12.7 g, 86.2 mmol) in EtOH (40 mL) was added dropwise to a solution of acetic anhydride (17.6 g, 172.4 mmol) in anhydrous EtOH (200 mL) at 0 ℃ for 16 h. The solvent was removed under vacuum on a rotary evaporator to give N- (5, 6, 7, 8-tetrahydronaphthalen-1-yl) acetamide (16.3 g, 100%) as a white solid and the crude was used for the next step without further purification. MS (ESI) m/e [M+1] +190
Step B: N- (8-oxo-5, 6, 7, 8-tetrahydronaphthalen-1-yl) acetamide
A solution of 15 %MgSO4 (1.68 g in 10 mL of H2O) was added to a suspension of N- (5, 6, 7, 8-tetrahydronaphthalen-1-yl) acetamide (1.9 g, 10 mmol) in acetone (30 mL) , then KMnO4 (4.74 g, 30 mmol) was added in several batches. The reaction mixture was stirred at room temperature for 2 h, filtered through celite and the solid was washed with DCM and water. The organic layer was separated and washed with brine, dried over Na2SO4, concentrated under vacuum. The residue was purified by silica gel chromatography (elution with hexane/ethyl acetate
1:5) to give N- (8-oxo-5, 6, 7, 8-tetrahydronaphthalen-1-yl) acetamide (1.2 g, 60%) as a yellow solid. MS (ESI) m/e [M+1] +204
Step C: 8-chloro-3, 4-dihydronaphthalen-1 (2H) -one
A mixture of CuCl2 and tert-butyl nitrile (495 mg, 4.8 mmol) in CH3CN (15 mL) was treated with N- (8-oxo-5, 6, 7, 8-tetrahydronaphthalen-1-yl) acetamide (484 mg, 3 mmol) in CH3CN (5 mL) at 65 ℃. After 10 min, the mixture was cooled to room temperature and the solvent was removed under vacuum. The residue was partitioned between water and EtOAc, the organic layer was washed with brine, dried over Na2SO4, concentrated under vacuum. The residue was purified by silica gel chromatography (elution with hexane/ethyl acetate 1: 10) to give 8-chloro-3, 4-dihydronaphthalen-1 (2H) -one (0.36 g, 67%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ7.32-7.33 (m, 2H) , 7.16 (t, J=5.2 Hz, 1H) , 2.97 (t, J=6.4 Hz, 2H) , 2.69 (t, J=6.4 Hz, 2H) , 2.07-2.13 (m, 1H) . MS (ESI) m/e [M+1] +181.
Step D: methyl 8-chloro-1-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
NaH (176 mg, 4.4 mmol) was added to methyl orthoformate (5 mL) , then a solution of 8-chloro-3, 4-dihydronaphthalen-1 (2H) -one (0.36 g, 2 mmol) in methyl orthoformate (5 mL) was added thereto. The mixture was stirred at 100 ℃ for 1 h, cooled to room temperature, poured into water, extracted with EtOAc. The organic layer was washed with brine, dried over Na2SO4, concentrated under vacuum. The residue was purified by silica gel chromatography (elution with hexane/ethyl acetate 1: 15) to give methyl
8-chloro-1-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate (0.28 g, 59%) as a yellow oil. 1H NMR (400 MHz, DMSO-d6) δ12.94 (s, 1H) , 7.29-7.31 (dd, J=1.2, 8 Hz, 1H) , 7.20 (t, J=7.6 Hz, 1H) , 7.08-7.10 (dd, J=1.2, 7.2 Hz, 1H) , 3.83 (s, 3H) , 2.73-2.77 (m, 2H) , 2.46-2.50 (m, 2H) . MS (ESI) m/e [M+1] +239.
Step E: methyl 8-chloro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate
Triethylsilane (2 mL) was added to a solution of methyl 8-chloro-1-oxo-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate (0.28 g, 1.17 mmol) in trifluoroacetic acid (5 mL) , then the reaction mixture was stirred at room temperature for 16 h. The solvent was removed under vacuum, the residue was concentrated with toluene azeotrope to give methyl 8-chloro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate (0.31 g, >100%) as a yellow oil. The crude was used for the next step without further purification. MS (ESI) m/e [M+1] +225.
Step F: 8-chloro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid
A solution of NaOH (0.28 g, 6.9 mmol) in H2O (5 mL) was added to a solution of 8-chloro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylate (0.31 g, 1.38 mmol) in MeOH (10 mL) , then the reaction mixture was stirred at room temperature for 1 h. The organics were removed under vacuum; the residual aqueous layer was acitified with aq HCl to pH 2-3. The solid was collected by filtered, dried under vacuum to give 8-chloro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid (200 mg, 69%) as a beige solid. The solid was used for the next step without further purification. MS (ESI) m/e [M-1] +209.
Step G: 2- ( (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (hydroxy) methylene) malononitrile
To a solution of 8-chloro-1, 2, 3, 4-tetrahydronaphthalene-2-carboxylic acid (200 mg, 0.95 mmol) in DCM (10 mL) was added HOBT (154 mg, 1.14 mmol) , EDCI (220 mg, 1.14 mmol) and Et3N (192 mg, 1.9 mmol) , after stirring at room temperature for 10 min, malononitrile (63 mg, 0.95 mmol) was added thereto. The reaction mixture was stirred at room temperature for 16 h. The solvent was removed under vacuum, the residue was partitioned between EtOAc and saturated aq NaHCO3. The organic layer was washed with aq NH4Cl, 1.25 N H2SO4, brine, dried over Na2SO4, concentrated under vacuum to give 2- ( (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (hydroxy) methylene) malononitrile (200 mg, 81%) as a yellow solid. MS (ESI) m/e [M-1] +257.
Step H: 2- ( (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (methoxy) methylene) malononitrile
A reaction mixture of 2- ( (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (hydroxy) methylene) malononitrile (200 mg, 0.77 mmol) in trimethyl Orthoformate (5 mL) was stirred at 100 ℃ for 1 h, then it was cooled to room temperature and the solvent was removed under vacuum. The crude was recrystallized with MeOH to give 2- ( (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (methoxy) methylene) malononitrile (120 mg, 57%) as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ7.22 (d, J=7.6 Hz, 1H) , 7.09 (t, J=7.2 Hz, 1H) , 7.01 (d, J=7.6 Hz, 1H) , 4.43 (s, 3H) , 3.24-3.29 (m, 1H) , 3.05-3.11 (m, 1H) , 2.90-2.93 (m, 2H) , 2.73-2.80 (m, 1H) , 2.01-2.04 (m, 1H) , 1.81-1.87 (m, 1H) .
Step I: 5-amino-3- (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
Hydrazine hydrate (0.84 g, 16.8 mmol) was added to a suspension of 2- ( (8-chloro-1, 2, 3, 4-tetrahydronaphthalen-2-yl) (methoxy) methylene) malononitrile (2.3 g, 8.4 mmol) in EtOH (20 mL) , then the reaction mixture was stirred at room temperature for 16 h. The solvent was removed under vacuum, the residue was recrystallized with MeOH to give 5-amino-3- (8-chloro-1, 2, 3, 4-tetra hydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile (2 g, 87%) as a white solid. MS (ESI) m/e [M+1] +273.
Compound 1.51 was prepared according to the procedures described for Compound 1.20 using the product of Step I under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ10.27 (s, 1H) , 7.67-7.71 (dd, J=2.4, 11.6 Hz, 1H) , 7.19-7.25 (m, 2H) , 7.09-7.16 (m, 2H) , 6.97-7.02 (m, 1H) , 6.72 (s, 2H) , 6.46-6.53 (m, 1H) , 6.33 (s, 2H) , 6.28-6.33 (m, 1H) , 5.75-5.78 (m, 1H) , 5.15 (s, 2H) , 3.44-3.50 (m, 1H) , 3.14-3.19 (m, 1H) ,
2.80-2.95 (m, 2H) , 2.67-2.74 (m, 1H) , 2.08-2.12 (m, 1H) , 1.65-1.72 (m, 1H) . MS (ESI) m/e [M+1] +468.
Compound 1.52 was prepared according to the procedures described for Compound 1.10 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ7.23-7.25 (d, J=7.6 Hz, 1H) , 7.08-7.15 (m, 2H) , 6.52-6.64 (m, 3H) , 6.00-6.23 (m, 3H) , 5.44-5.72 (m, 1H) , 4.18-4.36 (m, 1H) , 3.89-4.06 (m, 2H) , 3.39-3.55 (m, 3H) , 3.07-3.15 (m, 1H) , 2.67-2.94 (m, 3H) , 2.07 (m, 1H) , 1.66-1.94 (m, 5H) . MS (ESI) m/e [M+1] + 428.
Compound 1.53 was prepared according to the procedures described for Compound 1.11 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ7.22-7.25 (m, 1H) , 7.11-7.15 (m, 2H) , 6.73-6.88 (m, 1H) , 6.60 (s, 2H) , 6.24 (s, 2H) , 6.04-6.14 (m, 1H) , 5.61-5.71 (m, 1H) , 4.24-4.42 (m, 1H) , 3.96-4.05
(m, 2H) , 2.71-3.11 (m, 5H) , 2.19-2.22 (m, 1H) , 1.69-1.92 (m, 5H) , 1.42-1.47 (m, 1H) , 1.23-1.25 (m, 1H) . MS (ESI) m/e [M+1] + 428.
Compound 1.53 was separated into two enantiomeric stereoisomers compound 1.53a (peak 1, R or S, earlier peak) , and compound 1.53b (peak 2, S or R, later peak) by chiral prep-HPLC.
Compound 1.53a: 1H NMR (400 MHz, DMSO-d6) δ7.23-7.25 (dd, J=2.8, 6.4Hz, 1H) , 7.10-7.15 (m, 2H) , 6.73-6.88 (m, 1H) , 6.60 (s, 2H) , 6.24 (s, 2H) , 6.04-6.14 (m, 1H) , 5.61-5.71 (m, 1H) , 4.16-4.42 (m, 1H) , 3.96-4.05 (m, 2H) , 3.37-3.44 (m, 1H) , 2.71-3.07 (m, 6H) , 2.20 (m, 1H) , 1.42-1.92 (m, 5H) . MS (ESI) m/e [M+1] + 428.
Compound 1.53b: 1H NMR (400 MHz, DMSO-d6) δ7.23-7.25 (dd, J=2.0, 7.6Hz, 1H) , 7.10-7.15 (m, 2H) , 6.73-6.88 (m, 1H) , 6.60 (s, 2H) , 6.24 (s, 2H) , 6.04-6.10 (m, 1H) , 5.62-5.71 (m, 1H) , 4.16-4.42 (m, 1H) , 3.96-4.05 (m, 2H) , 3.37-3.44 (m, 1H) , 2.71-3.07 (m, 6H) , 2.20 (m, 1H) , 1.42-1.92 (m, 5H) . MS (ESI) m/e [M+1] + 428.
The separation conditions are shown below.
Compounds 1.54-1.60were prepared according to the procedures described for Compound 1.14 under appropriate conditions that could be recognized by one skilled in the art.
Compound 1.54
1H NMR (400 MHz, DMSO-d6) δ7.23-7.25 (d, J=7.2 Hz, 1H) , 7.08-7.15 (m, 2H) , 6.51-6.63 (m, 2H) , 6.01-6.20 (m, 3H) , 5.47-5.72 (m, 1H) , 4.23-4.43 (m, 1H) , 3.88-4.14 (m, 2H) , 3.38-3.78 (m, 4H) , 3.16-3.19 (m, 3H) , 2.67-3.05 (m, 4H) , 1.75-2.23 (m, 4H) . MS (ESI) m/e [M+1] + 458.
Compound 1.55
1H NMR (400 MHz, DMSO-d6) δ7.23-7.25 (d, J=6.4Hz, 1H ) , 7.08-7.15 (m, 2H) , 6.51-6.62 (m, 2H) , 6.03-6.21 (m, 3H) , 5.49-5.74 (m, 1H) , 5.08-5.33 (m, 1H) , 4.34-4.59 (m, 1H) , 3.82-4.21 (m, 3H) , 3.35-3.47 (m, 3H) , 2.67-3.04 (m, 4H) , 1.71-2.20 (m, 4H) . MS (ESI) m/e [M+1] + 446.
Compound 1.56
1H NMR (400 MHz, DMSO-d6) δ7.23-7.25 (d, J=6.8 Hz, 1H) , 7.08-7.15 (m, 2H) , 6.43-6.63 (m, 2H) , 6.21-6.25 (m, 1H) , 6.12 (s, 1H) , 6.03-6.08 (s, 1H) , 5.47-5.79 (m, 1H) , 4.49-4.67 (m, 1H) , 3.73-4.17 (m, 4H) , 3.35-3.42 (m, 1H) , 2.66-3.05 (m, 5H) , 2.32-2.49 (m, 1H) , 2.17-2.29 (m, 1H) , 1.68-1.77 (m, 1H) . MS (ESI) m/e [M+1] + 464.
Compound 1.57
1H NMR (400 MHz, DMSO-d6) δ 7.20–7.07 (m, 3H) , 6.81 (m, 1H) , 6.59 (s, 2H) , 6.21 (s, 2H) , 6.18–5.97 (m, 1H) , 5.77–5.54 (m, 1H) , 4.50–3.90 (m, 3H) , 3.43 (s, 1H) , 3.15–2.71 (m, 6H) , 2.17–2.01 (m, 1H) , 1.99–1.77 (m, 3H) , 1.77–1.59 (m, 1H) , 1.44 (s, 1H) . MS (ESI) m/e [M+1] + 428.
Compound 1.58
1H NMR (400 MHz, DMSO-d6) δ 7.21–7.05 (m, 3H) , 6.82 (m, 1H) , 6.59 (s, 2H) , 6.21 (s, 2H) , 6.17–5.98 (m, 1H) , 5.74–5.53 (m, 1H) , 4.46–3.89 (m, 3H) , 3.48–3.33 (m, 1H) , 3.14–2.73 (m, 6H) , 2.19–2.03 (m, 1H) , 2.01–1.79 (m, 3H) , 1.79–1.62 (m, 1H) , 1.44 (s, 1H) . MS (ESI) m/e [M+1] + 428.
Compound 1.59
1H NMR (400 MHz, DMSO-d6) δ 8.38 (s, 1H) , 7.18–6.92 (m, 4H) , 6.57 (s, 2H) , 6.23–5.93 (m, 3H) , 5.57 (dd, J=8.8, 3.6 Hz, 1H) , 4.22–4.02 (m, 2H) , 3.34–3.26 (m, 1H) , 3.06–2.68 (m, 4H) , 2.12 (d, J=13.2 Hz, 1H) , 1.69 (m, 1H) , 0.74 (m, 2H) , 0.65–0.55 (m, 2H) . MS (ESI) m/e [M+1] + 380.
Compound 1.60
1H NMR (400 MHz, DMSO-d6) δ 8.23 (s, 1H) , 7.07 (s, 4H) , 6.58 (s, 2H) , 6.24-6.05 (m, 2H) , 5.91 (s, 2H) , 5.57 (dd, J=10.0, 2.3 Hz, 1H) , 4.21 (s, 2H) , 3.38-3.36 (m, 1H) , 3.02-2.77 (m, 4H) , 2.28-2.26 (m, 2H) , 2.19–1.99 (m, 3H) , 1.91–1.52 (m, 3H) . MS (ESI) m/e [M+1] + 394.
Compound1.61:
1- ( (1- (acrylamidomethyl) cyclopropyl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1 H-pyrazole-4-carboxamide
Step 1: tert-butyl (1- (hydroxymethyl) cyclopropyl) methylcarbamate
To a solution of ethyl 1-cyanocyclopropanecarboxylate (200 mg, 1.4 mmol) in THF (10 ml) was added Lithium aluminum hydride (273 mg, 7.2 mmol) at 0 ℃. The reaction mixture was heated to 65 ℃ for 4h and cooled to 0 ℃. Water (10 ml) was added, filtered and washed with THF, (Boc) 2O (1.1eq) was added, stirred at rt for 2h. It was purified by prep-TLC (P/E=2: 1) to give a
white solid (50 mg) . 1H NMR (400 MHz, CDCl3) δ 5.11 (s, 1H) , 3.50 (s, 1H) , 3.38 (s, 2H) , 3.11 (d, J=6.4 Hz, 2H) , 1.44 (d, J=8.7 Hz, 9H) , 0.44 (d, J=6.0 Hz, 4H) .
Step 2: tert-butyl ( (1- ( (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) cyclopropyl) methyl) carbamate
To a solution of tert-butyl (1- (hydroxymethyl) cyclopropyl) methylcarbamate (200 mg, 1.01 mmol) in DCM (10 ml) was added TEA (0.3 ml, 2.0 mmol) and MsCl (126 mg, 1.1 mmol) at 0 ℃ for 1h. 10 ml of NaHCO3 was added and extracted with EA (10 ml) , dried over Na2SO4, evaporated in vacuum to give a colorless oil which was used directly in the next step. The crude product was dissolved in DMF (5 ml) and 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile (190 mg, 0.8 mmol) was added at 60 ℃, then the mixture was stirred at 60 ℃ for 1h. TLC showed the starting material (SM) was consumed completely. 25 ml of water was added and extracted with EA (20 ml) , combined organic layer was washed with brine (20 ml) , dried over Na2SO4, evaporated under vacuum to give colorless oil (400 mg) , which was purified by prep-TLC (P/E=1: 1) to give a white solid (290 mg) . MS (ESI) m/e [M+1] + 422.1H NMR (400 MHz, DMSO-d6) δ 7.11 (m, 4H) , 6.80 (s, 1H) , 6.56 (s, 1H) , 3.87 (s, 2H) , 3.05-2.90 (m, 5H) , 2.84 (dd, J=9.1, 5.4 Hz, 2H) , 2.10 (d, J=13.9 Hz, 1H) , 1.84 (dd, J=12.9, 8.6 Hz, 1H) , 1.37 (m, 9H) , 1.31 (s, 2H) , 0.43 (dd, J=23.2, 3.6 Hz, 4H) .
Step 3: 5-amino-1- ( (1- (aminomethyl) cyclopropyl) methyl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
tert-butyl ((1- ( (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) methyl) cyclopropyl) methyl) carbamate (290 mg) was dissolved in CH3SO3H (6 ml) . The reaction mixture was heated to 110 ℃ for 40 min. LC-MS showed SM was consumed completely. The mixture was cooled to 5 ℃ and NaHCO3 was added to adjust to pH 7~8, extracted with EA (10 ml) , combined organic layer was dried over Na2SO4, evaporated under vacuum to give a yellow solid (280 mg) . MS (ESI) m/e [M+1] + 340.
Step 4: 1- ( (1- (acrylamidomethyl) cyclopropyl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a solution of 5-amino-1- ( (1- (aminomethyl) cyclopropyl) methyl) -3-(1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (280 mg, 0.83 mmol) in CH3CN (10 ml) and water (10 ml) was added NaHCO3 (208 mg, 2.48 mmol) and acryloyl chloride (89 mg, 0.99 mmol) at 0 ℃. The reaction mixture was stirred a 0 ℃ for 20 min. 10ml of water was added extracted with EA (10 ml) , dried over Na2SO4, and evaporated under vacuum. The residue was purified by prep-TLC (DCM/MeOH=8: 1) to give a white solid (37 mg) . MS (ESI) m/e [M+1] + 394.1H NMR (400 MHz, DMSO-d6) δ 8.12 (d, J=5.1 Hz, 1H) , 7.07 (s, 2H) , 6.61 (s, 2H) , 6.27 (dd, J=17.0, 10.0 Hz, 1H) , 6.09 (d, J=17.0 Hz, 1H) , 5.61 (d, J=10.2 Hz, 1H) , 3.89 (s, 2H) , 3.38
(s, 1H) , 3.17 (d, J=4.6 Hz, 2H) , 3.04–2.72 (m, 4H) , 2.12 (d, J=13.7 Hz, 1H) , 1.81–1.66 (m, 1H) , 0.53 (s, 2H) , 0.40 (s, 2H) .
Compound1.62: 1- ( (R) -2-acrylamido-3-cyclopropylpropyl) -5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step 1: (R) -2- (tert-butoxycarbonylamino) -3-cyclopropylpropanoic acid
(R) -2-amino-3-cyclopropylpropanoic acid (0. 5g, 3.9 mmol) was suspended in ethanol (8 ml) and water (4 ml) , then 1N NaOH (5 ml ) was added. The reaction mixture was cooled to 10 ℃, (Boc) 2O (950 mg, 4.3 mmol) in THF (4 ml) was added and stirred at rt overnight. 15 ml of water was added and washed with tert-Butyl methyl ether (MTBE, 10 ml) , water layer was acidified by 3M HCl to adjust to pH 4, extracted with EA (15 ml) . Combined organic layer was dried over Na2SO4, evaporated under vacuum to givecolorless oil (640 mg) .
Step 2: (R) -tert-butyl 1-cyclopropyl-3-hydroxypropan-2-ylcarbamate
To a solution of (R) -2- (tert-butoxycarbonylamino) -3-cyclopropylpropanoic acid (780 mg, 3.4mmol) in THF (15 ml) was added TEA (0.6 ml, 4.1 mmol) and isopropyl carbonochloridate (513 mg) at 0 ℃. The reaction mixture was stirred at rt for 0.5 h, filtered and washed with THF, and cooled to 0 ℃, NaBH4 (260 mg, 6.8 mmol) in water (1.5 ml) was added. The reaction mixture was stirred at rt for 2h. 20 ml of water was added and extracted with EA (20 ml) , combined organic layer was washed with brine (20 ml) , dried over Na2SO4, evaporated under vacuum to give a white solid (809 mg) .
Step 3: tert-butyl (R) -1- (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) -3-cyclopropylpropan-2-ylcarbamate
To a solution of (R) -tert-butyl 1-cyclopropyl-3-hydroxypropan-2-ylcarbamate (809 mg, 3.8 mmol) in DCM (20 ml) was added TEA (1.0 ml, 7.5 mmol) and MsCl (0.32 ml, 4.1 mmol) at 0 ℃.The reaction mixture was stirred at 0 ℃ for 1h. NaHCO3 (20 ml) was added and extracted with DCM (20 ml) , dried over Na2SO4, which was used directly in the next step. The crude product was dissolved in DMF (6 ml) , then Cs2CO3 (1.8 g, 7.5 mmol) and 5-amino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile (716 mg, 3.0 mmol) were added. The reaction mixture was heated to 60 ℃ for 2h. The residue was purified by prep-TLC (P/E=1: 1) to give a white solid (33 mg) . MS (ESI) m/e [M+1] + 436.
Step 4: 5-amino-1- ( (R) -2-amino-3-cyclopropylpropyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile hydrochloride
(R) -1- (5-amino-4-cyano-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazol-1-yl) -3-cyc lopropylpropan-2-ylcarbamate (500 mg) was dissolved in HCl/dioxane (5 ml) . The reaction mixture was stirred at rt for 2h. TLC showed SM was consumed completely. Solvent was removed under vacuum to give a white solid (460 mg) . MS (ESI) m/e [M+1] + 336.
Step 5: 5-amino-1- ( (R) -2-amino-3-cyclopropylpropyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a solution of 5-amino-1- ( (R) -2-amino-3-cyclopropylpropyl) -3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carbonitrile hydrochloride (460 mg) in methanol (15 ml) was added 5M NaOH (5 ml) . The reaction mixture was cooled to 10 ℃ and added DMSO (1 ml) and 30%H2O2 (2 ml) . The mixture was heated to 50 ℃ for 2h. TLC showed SM was consumed completely. Solvent was removed under vacuum and diluted with water (10 ml) , filtered and washed with water, dried under vacuum to give a yellow solid (270 mg) . MS (ESI) m/e [M+1] + 354.
Step 6: 1- ( (R) -2-acrylamido-3-cyclopropylpropyl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a solution of 5-amino-1- ( (R) -2-amino-3-cyclopropylpropyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide (170 mg, 0.48 mmol) in CH3CN (10 ml) and water (8 ml) was added NaHCO3 (81 mg, 0.96 mmol) and acryloyl chloride (48 mg, 0.53 mmol) at 0 ℃ . The reaction mixture was stirred at 0 ℃ for 15 min. 10 ml of water was added, filtered and washed with water, to give a white solid, which was purified by prep-TLC (DCM/MeOH=8: 1) to give a white solid (80 mg) . 1H NMR (400 MHz, DMSO-d6) δ 8.21–8.09 (m, 1H) , 7.16 (d, J=2.8 Hz, 4H) , 6.65 (s, 2H) , 6.37–6.10 (m, 4H) , 5.67 (dd, J=10.1, 2.2 Hz, 1H) , 4.25 (dd, J=8.5, 4.7 Hz, 1H) , 4.00–3.91 (m, 2H) , 3.49–3.42 (m, 1H) , 3.10–2.80 (m, 4H) , 2.19 (d, J=10.4 Hz, 1H) , 1.89–1.70 (m, 1H) , 1.54–1.30 (m, 2H) , 0.78 (d, J=6.5 Hz, 1H) , 0.51–0.37 (m, 2H) , 0.21–0.13 (m, 1H) , 0.01 (dt, J=8.7, 4.8 Hz, 1H) . MS (ESI) m/e [M+1] + 408.
Compound1.63 was prepared according to the procedures described for synthesis of Compound 1.62 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ 8.10 (dd, J=8.3, 4.3 Hz, 1H) , 7.16 (d, J=2.9 Hz, 4H) , 6.65 (s, 2H) , 6.34–6.11 (m, 4H) , 5.67 (dd, J=10.1, 2.2 Hz, 1H) , 4.30–4.20 (m, 1H) , 3.96 (d, J=6.1 Hz, 2H) , 3.50–3.43 (m, 1H) , 3.10–2.81 (m, 4H) , 2.19 (d, J=13.1 Hz, 1H) , 1.88–1.71 (m,
1H) , 1.54–1.30 (m, 2H) , 0.79 (s, 1H) , 0.51–0.38 (m, 2H) , 0.22-0.12 (m, 1H) , 0.05-0.04 (m, 1H) . MS (ESI) m/e [M+1] + 408.
Compound 64 was prepared according to the procedures described for synthesis of Compound 1.11 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ7.23-7.25 (d, J=7.2Hz, 1H) , 7.08-7.15 (m, 2H) , 6.59-6.68 (m, 4H) , 6.23 (s, 2H) , 3.94-4.39 (m, 3H) , 3.32-3.51 (m, 2H) , 2.71-3.19 (m, 8H) , 2.21 (s,6H) , 1.45-1.91 (m, 5H) . MS (ESI) m/e [M+1] + 485.
Compound1.65: 1- ( ( (2S, 4S) -1-acryloyl-4- (dimethylamino) pyrrolidin-2-yl) methyl) -5-a mino-3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: (2S, 4S) -tert-butyl 4- (dimethylamino) -2- (hydroxymethyl) pyrrolidine-1-carboxylate
To a stirred solution of (2S, 4S) -1-tert-butyl 2-methyl 4- (dimethylamino) pyrrolidine-1, 2-dicarboxylate (4.9 g, 18 mmol) in THF was added NaBH4 (1.7 g, 45 mmol) and LiCl (1.67 g, 40 mmol) at 0 ℃ and followed by the addition of EtOH in drops. After the addition, the mixture was stirred at room temperature for 16 hrs. The mixture was concentrated and added 50 mL of aqueous NaHCO3, extracted with CH2Cl2 (50 mL x 3) . The combined extracts were washed with brine (50 mL x 2) , dried over Na2SO4, concentrated to give 2.9 g of crude product. 1.6 g of which was purified by column chromatography eluting with CH2Cl2/MeOH (100: 1 ~ 40: 1) to obtain the title product (810 mg, yield: 32%) as a light yellow solid. MS: M/e 245 (M+1) +.
Step B: (2S, 4S) -tert-butyl 4- (dimethylamino) -2-formylpyrrolidine-1-carboxylate
A solution of DMSO (400 mg, 5.1 mmol) in 2 mL of CH2Cl2 was added into a solution of oxalyl dichloride (510 mg, 4 mmol) in 2 mL of CH2Cl2 in drops at -78 ℃ under N2. After stirring for 10 min, a solution of the product of Step A (250 mg, 1 mmol) in 2 mL of CH2Cl2 was added slowly below -60 ℃. The mixture was stirring for 4 hrs. A solution of Et3N (800 mg, 8 mmol) in 2 mL of CH2Cl2 was injected, and the mixture was allowed warm to room temperature and stirred for another 1 hour. The mixture was diluted with 20 mL of CH2Cl2, washed with brine (20 mL x 3) , dried, concentrated to dryness to give crude product (280 mg ) as light yellow oil which was used for the next step directly. MS: M/e 243 (M+1) +.
Step C: (2S, 4S) -tert-butyl 2- ( (E) - (2- (tert-butoxycarbonyl) hydrazono) methyl) -4- (dimethylamino) pyrrolidine-1-carboxylate
A mixture of the product of Step B (280 mg, crude) and tert-butyl hydrazinecarboxylate (160 mg, 1.2 mmol) in MeOH (5 mL) was stirred at room temperature for 5 hrs. The mixture was concentrated to dryness to give the title product (380 mg, crude) as light yellow oil which was used for the next step directly. MS: M/e 357 (M+1) +.
Step D: (2S, 4S) -tert-butyl 2- ( (2- (tert-butoxycarbonyl) hydrazinyl) methyl) -4- (dimethylamino) pyrrolidine-1-carboxylate
To a stirred solution of the product of Step C (380 mg, crude) in a mixed solvent AcOH/H2O (1: 1, 5 mL) was added NaBH3CN (160 mg, 2.6 mmol) at room temperature and the mixture was stirred for 5 hrs. The mixture was concentrated, and added 10 mL of aqueous NaOH (2M) , extracted with CH2Cl2 (10 mL x 5) . The combined extracts were washed brine (10 mL x 3) , dried over Na2SO4, and concentrated to dryness and purified by column chromatography eluting with CH2Cl2/MeOH (50: 1 ~ 30: 1, 0.3%of NH3/MeOH) to obtain the title product (105 mg, yield: 29%for 3 steps) as colorless oil. MS: M/e 359 (M+1) +.
Step E: (3S, 5S) -5- (hydrazinylmethyl) -N, N-dimethylpyrrolidin-3-amine
To a stirred solution of the product of step D (105 mg, 0.29 mmol) in EA (1 mL) was added HCl/EA (5 mL, 5 M) at room temperature and the mixture was stirred for 5 hrs. The mixture was concentrated to dryness and 20 mL of EA was added and the mixture was concentrated again to remove the residual of HCl to give the title product (86 mg, yield: 96%) as a white solid. MS: M/e 159 (M+1) +.
Step F: 5-amino-1- ( ( (2S, 4S) -4- (dimethylamino) pyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A mixture of the product of step E (86 mg, 0.28 mmol) , and 2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile (68 mg, 0.29 mmol) in
EtOH (2 mL) was added Et3N (200 mg, 2 mmol) at room temperature and the mixture was stirred for 3 hrs. The mixture was concentrated to dryness to give the title product (158 mg, crude) as a dark brown solid which was used for the next step directly. MS: M/e 365 (M+1) +.
Step G: 5-amino-1- ( ( (2S, 4S) -4- (dimethylamino) pyrrolidin-2-yl) methyl) -3- (1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A solution of the product of step F (158 mg, crude) in MeSO3H (5 mL) was heated at 70 ℃ for 3 hrs. The mixture was cooled to room temperature and was added an aqueous NaOH in drops to pH~9. The mixture was extracted with CH2Cl2 (20 mL x 5) . The combined extracts was washed with brine (20 mL x 3) , dried, concentrated to dryness to give crude product (145 mg ) as brown oil which was used for the next step directly. MS: M/e 383 (M+1) +.
Step H: 1- ( ( (2S, 4S) -1-acryloyl-4- (dimethylamino) pyrrolidin-2-yl) methyl) -5-amino-3- (1, 2, 3, 4-tetrahydro naphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of step G (145 mg, crude) and NaHCO3 (100 mg, 1.2 mmol) in a mixed solvent MeCN/H2O (1: 1, 4 mL) was added a solution of acryloyl chloride (25 mg, 0.28 mmol) in MeCN (1 mL) in drops at room temperature. The mixture was stirred for 2 hrs. EA (10 mL) was added and the mixture was washed with brine (5 mL x 3) , dried, concentrated to dryness and the resulted residue was purified by prep-TLC (CH2Cl2/MeOH=12: 1, 0.5%of NH3/MeOH) , and prep-HPLC to give the title product (18 mg, yield: 15%for 3 steps) as a white solid. 1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.10–6.98 (m, 4H) , 6.65-6.25 (m, 3H) , 6.20–6.02 (m, 1H) , 5.92 (s, 2H) , 5.65 (s, 1H) , 4.34–3.69 (m, 4H) , 3.41–3.25 (m, 1H) , 3.01–2.72 (m, 5H) , 2.65–2.52 (m, 1H) , 2.15 (s, 6H) , 2.13–1.90 (m, 2H) , 1.83–1.71 (m, 2H) . MS: M/e 437 (M+1) +.
Compound 1.65a: 1- ( ( (2S, 4S) -1-acryloyl-4- (dimethylamino) pyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: 5-amino-1- ( ( (2S, 4S) -4- (dimethylamino) pyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A mixture of (3S, 5S) -5- (hydrazinylmethyl) -N, N-dimethylpyrrolidin-3-amine (190 mg, 0.63 mmol) , and (R) -2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile (165 mg, 0.69 mmol) in EtOH (5 mL) was added Et3N (600 mg, 2 mmol) at room temperature and the mixture was stirred for 3 hrs. The mixture was concentrated. The residue was diluted with 10 mL of CH2Cl2 and washed with brine (50 mL x 3) , dried over Na2SO4 and concentrated to give the title product (280 mg, crude) as a dark brown solid which was used for the next step directly. MS: M/e 365 (M+1) +.
Step B: 5-amino-1- ( ( (2S, 4S) -4- (dimethylamino) pyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A solution of the product of Step A (280 mg, crude) in MeSO3H (5 mL) was heated at 70 ℃ for 3 hrs. The mixture was cooled to room temperature and was added an aqueous NaOH in drops to pH~9. The mixture was extracted with CH2Cl2 (20 mL x 5) . The combined extracts were washed with brine (20 mL x 3) , dried and concentrated to give crude product (170 mg ) as a brown oil which was used for the next step directly. MS: M/e 383 (M+1) +.
Step C: 1- ( ( (2S, 4S) -1-acryloyl-4- (dimethylamino) pyrrolidin-2-yl) methyl) -5 -amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of Step B (170 mg, crude) and NaHCO3 (180 mg, 1.2 mmol) in a mixed solvent MeCN/H2O (1: 1, 5 mL) was added a solution of acryloyl chloride (40 mg, 0.45 mmol) in MeCN (1 mL) in drops at room temperature. The mixture was stirred for 2 hrs. EA (20 mL) was added and the mixture was washed with brine (10 mL x 3) , dried and concentrated. The resulted residue was purified by prep-HPLC to give the title product (45 mg, yield: 16%for 3 steps) as a white solid. 1H NMR (400 MHz, DMSO-d6, 80℃) δ 7.05 (s, 4H) , 6.75-6.25 (m, 3H) , 6.20–6.02 (m, 1H) , 5.92 (s, 2H) , 5.75–5.45 (m, 1H) , 4.45–3.69 (m, 4H) , 3.45–3.25 (m, 1H) , 3.01–2.72 (m, 5H) , 2.66–2.50 (m, 1H) , 2.15 (s, 6H) , 2.13–1.90 (m, 2H) , 1.83–1.71 (m, 2H) . MS: M/e 437 (M+1) +. ee: 100%, retention time: 9.662 min.
The chiral analysis conditions are shown below.
Compound 1.66a was prepared according to the procedures described for the synthesis of Compound 1.65a under appropriate conditions that could be recognized by one skilled in the art.
1H-NMR (400 MHz, DMSO-d6) δ7.07 (s, 4H) , 6.70–6.50 (m, 3H) , 6.27–5.98 (m, 3H) , 5.81–5.40 (m, 1H) , 4.47–4.20 (m, 1H) , 4.06–3.84 (m, 2H) , 3.80–3.49 (m, 1H) , 3.31–3.15 (m, 2H) , 3.08–2.72 (m, 4H) , 2.61–2.52 (m, 1H) , 2.19–2.06 (m, 7H) , 2.04–1.93 (m, 1H) , 1.84–1.63 (m, 2H) ppm. MS: M/e 437 (M+1) +.
Compound1.67a: 1- ( ( (2S, 4R) -1-acryloyl-4- (2- (dimethylamino) ethoxy) pyrrolidin-2-yl) methyl) -5 -amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
Step A: 2-chloro-N, N-dimethylethanamine hydrochloride
To a solution of 2- (dimethylamino) ethanol (2.0 g, 22.5 mmol) in DCM (20 mL) was added dropwise thionyl chloride (3.5 g, 29.3 mmol) at 0 ℃. Then the reaction was stirred at rt overnight. Removing solvent, the residue was suspended with PE: EA 10: 1 (50 mL) . The mixture was filtered, and the solid was collected and dried to afford the product (3.2 g, yield: 100%)
Step B: (2S, 4R) -1-tert-butyl 2-methyl 4- (2- (dimethylamino) ethoxy) pyrrolidine-1, 2-dicarboxylate
To a solution of (2S, 4R) -1-tert-butyl 2-methyl4-hydroxypyrrolidine-1, 2-dicarboxylate (4.3 g, 17.5 mmol) in DMF (50 mL) was added NaH (1.75 g, 43.8 mmol) at 0 ℃. The reaction mixture was stirred at 0 ℃ for 15 min. Then the product of Step A (3.0 g, 21 mmol) was added at 0 ℃. Allowed to warm to rt, the reaction was stirred at rt overnight. The reaction was quenched with H2O (20 mL) at 0 ℃. The mixture was diluted with H2O (50 mL) and extracted with DCM (50 mL x 3) . The combined extracts were washed with brine (50 mL x 2) , dried over Na2SO4, concentrated to give the product which was purified by column chromatography eluting with CH2Cl2/MeOH (10: 1) to obtain the title product (650 mg, yield: 12%) as a light yellow solid. MS: M/e 317 (M+1) +.
Step C: (2S, 4R) -tert-butyl 4- (2- (dimethylamino) ethoxy) -2- (hydroxymethyl) pyrrolidine-1-carboxylate
To a stirred solution of the product of Step B (650 mg, 2.0 mmol) in THF (6mL) was added NaBH4 (190 g, 5.0 mmol) and LiCl (187 g, 4.4 mmol) at 0 ℃, followed by the addition of EtOH (4 mL) in drops. After the addition, the mixture was stirred at room temperature for 2 days. The mixture was concentrated and the mixture was suspended with DCM (50 mL) . The mixture was filtered, and the filtrates was concentrated to afford the crude product which was purified by column chromatography eluting with CH2Cl2/MeOH (20: 1) to obtain the title product (300 mg, yield: 50%) as yellow oil. MS: M/e 289 (M+1) +.
Step D: (2S, 4R) -tert-butyl 4- (2- (dimethylamino) ethoxy) -2-formylpyrrolidine-1-carboxylate
To a solution of oxalyl dichloride (635 mg, 5 mmol) in 2 mL of CH2Cl2 was added a solution of DMSO (468 mg, 6 mmol) in 2 mL of CH2Cl2 in drops at -78 ℃ under N2. After stirring for 10 min, a solution of the product of Step C (300 mg, 1 mmol) in 2 mL of CH2Cl2 was added slowly below -60 ℃. The mixture was stirring for 2 hrs. A solution of Et3N (800 mg, 8 mmol) in 2 mL of CH2Cl2 was injected, and the mixture was allowed warm to room temperature and stirred for another 1 hour. The mixture was diluted with 10 mL of H2O, extracted with DCM (15 mL x 5) , dried, concentrated to dryness to give crude product (410 mg ) as yellow oil which was used for the next step directly. MS: M/e 287 (M+1) +.
Step E: (2S, 4R) -tert-butyl 2- ( (E) - (2- (tert-butoxycarbonyl) hydrazono) methyl) -4- (2- (dimethylamino) ethoxy) pyrrolidine-1-carboxylate
A mixture of the product of step D (410 mg, crude) and tert-butyl hydrazinecarboxylate (132mg, 1.0 mmol) in MeOH (5 mL) was stirred at room temperature for 5 overnight. The mixture
was concentrated to dryness to give the title product (500 mg, crude) as yellow oil which was used for the next step directly. MS: M/e 401 (M+1) +.
Step F: (2S, 4R) -tert-butyl 2- ( (2- (tert-butoxycarbonyl) hydrazinyl) methyl) -4- (2- (di methylamino) ethoxy) pyrrolidine-1-carboxylate
To a stirred solution of the product of step E (500 mg, crude) in a mixed solvent AcOH/H2O (1: 1, 4 mL) was added NaBH3CN (95 mg, 1.5 mmol) at room temperature and the mixture was stirred for 3 hrs. The mixture was concentrated, and the residue was adjusted to pH=8-9 with aqueous NaOH (2M) . Then the mixture was extracted with CH2Cl2 (10 mL x 5) . The combined extracts were washed brine (10 mL) , dried over Na2SO4, and concentrated to dryness and purified by column chromatography eluting with CH2Cl2/MeOH (25: 1, 0.3%of NH3/MeOH) to obtain the title product (260 mg, yield: 65%for 3 steps) as colorless oil. MS: M/e 403 (M+1) +.
Step G: 2- ( ( (3R, 5S) -5- (hydrazinylmethyl) pyrrolidin-3-yl) oxy) -N, N-dimethylethanamine hydrochloride
To a stirred solution of the product of step D (260 mg, 0.65 mmol) in EA (1 mL) was added HCl/EA (5 mL, 5 M) at room temperature and the mixture was stirred for 2 hrs. The mixture was concentrated to dryness to give the title product (360 mg, yield: 100%) as a white solid. MS: M/e 203 (M+1) +.
Step H: 5-amino-1- ( ( (2S, 4R) -4- (2- (dimethylamino) ethoxy) pyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carbonitrile
A mixture of the product of step E (360 mg, 0.65 mmol) , and (R) -2- (methoxy (1, 2, 3, 4-tetrahydronaphthalen-2-yl) methylene) malononitrile (155 mg, 0.65 mmol) in EtOH (5 mL) was added Et3N (0.5) at room temperature and the mixture was stirred for 1h. The mixture was concentrated to dryness and purified by column chromatography eluting with CH2Cl2/MeOH (10: 1, 0.3%of NH3/MeOH) to obtain the title product (150 mg, crude) as yellow solid. MS: M/e 409 (M+1) +.
Step I: 5-amino-1- ( ( (2S, 4R) -4- (2- (dimethylamino) ethoxy) pyrrolidin-2-yl) methyl) -3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
A solution of the product of step H (150 mg, crude) in MeSO3H (5 mL) was heated at 70 ℃ for 3 hrs. The mixture was cooled to room temperature and was adjusted to pH~8 with an aqueous NaOH (2N) in drops at 0 ℃. The mixture was extracted with CH2Cl2 (15 mL x 5) . The combined extracts were washed with brine (10 mL) , dried, concentrated to dryness to give crude product (110 mg, crude) as brown oil which was used for the next step directly. MS: M/e 427 (M+1) +.
Step J: 1- ( ( (2S, 4R) -1-acryloyl-4- (2- (dimethylamino) ethoxy) pyrrolidin-2-yl) methyl) -5-amino-3- ( (R) -1, 2, 3, 4-tetrahydronaphthalen-2-yl) -1H-pyrazole-4-carboxamide
To a mixture of the product of step I (110 mg, crude) and NaHCO3 (87 mg, 1.0 mmol) in a mixed solvent MeCN/H2O (1: 1, 4 mL) was added a solution of acryloyl chloride (24 mg, 0.26 mmol) in MeCN (1 mL) in drops at 0 ℃. The mixture was stirred for 10 min. EA (50 mL) was added and the mixture was washed with brine (10 mL) , dried, concentrated to dryness and the resulted residue was purified prep-HPLC to give the title product (5 mg, yield: 2%for 3 steps) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.07 (s, 4H) , 6.71–6.50 (m, 2H) , 6.26–5.99 (m, 3H) , 5.76–5.42 (m, 1H) , 4.51–4.22 (m, 1H) , 4.13–4.02 (m, 1H) , 3.98–3.82 (m, 1H) , 3.64–3.49 (m, 1H) , 3.46–3.37 (m, 3H) , 3.04–2.76 (m, 4H) , 2.39–2.28 (m, 2H) , 2.15–1.65 (m, 12H) . MS: M/e 481 (M+1) +.
Example 2: Synthesis of Compounds 2.1-2.11
Compound 2.1: 1- (2-acrylamidobenzyl) -5-amino-3- (6, 7, 8, 9-tetrahydro-5H-benzo [7] annulen -6-yl) -1H-pyrazole-4-carboxamide
Compound 2.1 was prepared according to the procedures described for Compound 1.20 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ 10.41 (br. s, 1H) , 7.62 (d, J=7.8 Hz, 1H) , 7.45 (d, J =7.2 Hz, 1H) , 7.25 (t, J=7.8 Hz, 1H) , 7.19–7.02 (m, 6H) , 6.78–6.50 (m, 3H) , 6.29 (d, J=18.4 Hz, 1H) , 5.79 (d, J=10.4 Hz, 1H) , 4.31 (s, 2H) , 3.18 (d, J=9.2 Hz, 2H) , 2.88–2.71 (m, 3H) , 2.17–1.78 (m, 3H) , 1.40 (d, J=14.0 Hz, 1H) ppm. MS: M/e 430 (M+1) +
Compound 2.2: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (6, 7, 8, 9-tetrahydro-5H-benzo [7] annulen-6-yl) -1H-pyrazole-4-carboxamide
Compound 2.2was prepared according to the procedures described for Compound 1.14 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ 7.16-7.00 (m, 4H) , 6.56 (br. s, 1H) , 6.43-5.95 (m, 3H) , 5.80-5.38 (m, 2H) , 4.45-4.18 (m, 1H) , 4.12-3.85 (m, 2H) , 3.49 (br. s, 2H) , 3.16-2.68 (m, 5H) , 2.13-2.01 (m, 2H) , 1.84 (s, 5H) , 1.53-1.33 (m, 1H) ppm. MS: M/e 408 (M+1) +
Compound 2.3: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (6, 7, 8, 9-tetrahydro-5H-benzo [7] annulen-6-yl) -1H-pyrazole-4-carboxamide
Compound 2.3 was prepared according to the procedures described for Compound 1.15 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ 7.23-7.00 (m, 4H) , 6.95-6.72 (m, 1H) , 6.48 (br. s, 2H) , 6.21-6.01 (m, 1H) , 5.77-5.60 (m, 1H) , 4.41-3.97 (m, 3H) , 3.44-2.67 (m, 7H) , 2.16 (d, J=12.4 Hz, 1H) , 2.06–1.72 (m, 5H) , 1.45–1.36 (m, 2H) ppm. MS: M/e 408 (M+1) +
Compound 2.4: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (2, 3, 4, 5-tetra hydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
Step A: Ethyl 4- (2-formylphenoxy) butanoate
To a solution of 2-hydroxybenzaldehyde (122g, 1.0mol) and ethyl 4-bromobutanoate (195g, 1.0mol) in DMF (500mL) was added Cs2CO3 (325g, 1.0mol) at room temperature, the reaction mixture was stirred at room temperature for 3 hours. The mixtures was quenched with H2O(1500mL) , EA (1500mL) was added, the organic layer was washed with brine (500mL) , dried over Na2SO4 and concentrated to give yellow oil (W=224g, Y=95%) which was used to the next step without further purification. 1H NMR (400 MHz, DMSO-d6) δ 10.37 (s, 1H) , 7.62-7.70 (m, 2H) , 7.22 (d, 1H, J=8.4 Hz) , 7.07 (t, 1H, J=7.2 Hz) , 4.16 (t, 2H, J=6.0 Hz) , 4.05 (q, 2H, J=7.2 Hz) , 2.50-2.51 (m, 2H) , 1.99-2.08 (m, 2H) and 1.15-1.19 (q, 3H, J=7.2 Hz) . MS (ESI) m/e [M+1] +237
Step B: Methyl 2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylate
Ethyl 4- (2-formylphenoxy) butanoate (32g, 135mmol) in dimethyl carbonate (600mL) was dropwised CH3ONa (5.4 M in MeOH) (30mL, 162mmol) at 50℃, it was stirred for another 2 hours at 50℃. The mixture was quenched with H2O (600mL) , EA (600mL) was added; the organic layer was washed with brine (200mL) , dried over Na2SO4 and concentrated. The residue was dissolved in EA/MeOH (100mL/100mL) , and then 10%Palladium on carbon (50%water wet, 5.0g) was added, the reaction mixture was hydrogenated with H2 at 1.5Mpa overnight. The catalyst was removed by filtrating, the filtrate was concentrated. The residue was purified by chromatography on silica gel usingPE/EA (1: 5-1: 10) as eluting solvent to give19.0 g (Y=68%) product as yellow oil. 1H NMR (400 MHz, DMSO-d6) δ7.13-7.22 (m, 2H) , 6.92-7.01 (m, 2H) , 4.18-4.23 (m, 1H) , 3.74-3.79 (m, 2H) , 3.61 (s, 3H) , 2.96-2.97 (m, 2H ) , and 1.99-2.13 (m, 2H) . MS (ESI) m/e [M+1] +207
Step C: 2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylic acid
To a solution of methyl 2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylate (19.0g , 92.2mmol) in MeOH/H2O (150mL/50mL) was added lithium hydroxide (13.8g, 276.6mmol) at 5℃-10 ℃, the mixture was stirred at room temperature for 5 hours. Then the solvent was removed by reduce pressure. The residue was acidized with 1N HCl adjust to pH=3-4, the precipitate was filtered to give a white solid which was dried over infrared box (W=17.0g, Y=96%) . 1H NMR (400 MHz, DMSO-d6) δ 12.36 (s, 1H) , 7.12-7.22 (m, 2H) , 6.92-7.00 (m, 2H) , 4.14-4.24 (m, 1H) , 3.73-3.78 (m, 2H) , 2.90-2.99 (m, 2H ) and 1.99-2.13 (m, 2H) . MS (ESI) m/e [M+1] +193
Step D: 2- (Hydroxy (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) methylene) malononitrile
2, 3, 4, 5-Tetrahydrobenzo [b] oxepine-4-carboxylic acid (24.6g, 128mmol) was suspended in EA (200mL) , then HOBt (19.0g, 141mmol) was added, the mixture was stirred at RT for 0.5 hour, then Et3N (38.8g, 384mmol) was added, the reaction mixture was stirred for another 0.5 hour, then EDCI (27.09g, 141mmol) was added, then the mixture was stirred for another 0.5 hour, then malononitrile (9.3g, 141mmol) was dropwised. The reaction mixture was stirred at RT for overnight. The reaction mixture was quenched with H2O, EA (200mL) was added, washed with aq NaHCO3 (500mL) , then the organic layer was stirred with aq H2SO4 (25g/200mL H2O) for 3 hours, which was then directly concentrated to give yellow oil as crude product (w=27.0 g, Y=88%) . MS (ESI) m/e [M+1] +241.
Step E: 5-Amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carbo nitrile
2- (Hydroxy (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) methylene) malononitrile (27.0g, 112.5 mmol) was dissolved in trimethoxymethane (600mL) , the reaction mixture was heated to 100℃ for 5 hours. The solvent was removed by reduced pressure to give crude product, which was dissolved in EtOH (100mL) , then hydrazine hydrate (6.12g, 123.75mmol ) was added at 5℃-10 ℃for 0.1 hour. The reaction mixture was stirred at RT overnight, and then solvent was removed by reduced pressure. The residue was purified by chromatography on silica gel usingEA (V=1.0L) as eluting solvent to give21.0 g (Y=73%) product as yellow oil. 1H NMR (400 MHz, DMSO-d6) δ
11.66 (s, 1H) , 7.14-7.20 (m, 2H) , 6.94-7.01 (m, 2H) , 6.30 (s, 2H) , 4.37-4.40 (m, 1H) , 3.66-3.71 (m, 1H) , 3.35 (m, 1H) , 2.85-2.89 (m, 2H) and 2.06-2.23 (m, 2H) .
Step F: 5-Amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
A solution of 5-amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole -4-carbonitrile (4.7g, 18.5 mmol) and in H3PO4 (60mL) was stirred for 1h at 130℃. LC/MS showed it was completed. The mixture was poured into ice-water and adjusted pH>8 with aq. NaOH. The mixture was extracted with EtOAc (100mL× 3) and dried over with Na2SO4, filtered and concentrated to give crude product, which was purified by chromatography column on silica (150 g) using EtOAc (3L) as eluting to give the product (2g, 40%) as a brown solid. MS (ESI) m/e [M+1] +273.
Step G: (3R) -tert-butyl3- (5-amino-4-carbamoyl-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate
To a solution of 5-amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide (600mg, 2.21 mmol) in DMF (30mL) was added (S) -tert-butyl
3- (tosyloxy) piperidine-1-carboxylate (BL-1, 1.6g, 4.42 mmol) and Cs2CO3 (1.44 g, 4.42 mmol) . The mixture was stirred overnight at 70℃. After cooling to RT, the solution was removed in vacuo. H2O (50 mL) was added to the residue, extracted with EtOAc (50 mL× 3) . The organic layer was purified with chromatography column on silica (50 g) eluting with EtOAc (1L) to give the product (200mg, 20%) as a brown solid. MS (ESI) m/e [M+1] +456.
Step H: 5-Amino-1- ( (R) -piperidin-3-yl) -3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
To a solution of (3R) -tert-butyl3- (5-amino-4-carbamoyl-3- (2, 3, 4, 5-tetrahydrobenzo [b] -oxepin-4-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate (200 mg, 0.44 mmol) in DCM (20 mL) was added CF3CO2H (2 mL) and stirred for 30 min. TLC showed the reaction was completed. The mixture was adjusted pH> 8 with saturated NaHCO3. The aqueous layer was extracted with DCM (20mL) , dried over with Na2SO4, filtered and concentrated to give the product (390mg, 250%) as brown oil, which was used to the next step without further purification.
Step I: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
To a solution of 5-amino-1- ( (R) -piperidin-3-yl) -3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide (390 mg, 1.1mmol) and Et3N (2ml) in DCM was slowly dropwised acryloyl chloride (99mg, 1.1 mmol) at 0℃. The mixture was stirred for 2 mins at 0℃ and was quenched with H2O (30 ml) , extracted with DCM (30 ml × 2) , dried with Na2SO4, filtered and concentrated to give the crude product, which was further purified by prepare-HPLC to give the product (46.32 mg, 10%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ7.11-7.18 (m, 2H) , 6.92-6.99 (m, 2H) , 6.73-6.89 (m, 1H) , 6.56 (s, 2H) , 6.20 (s, 2H) , 6.04-6.15 (m, 1H) , 5.61-5.71 (m, 1H) , 4.35-4.40 (m, 1H) , 3.94-4.27 (m, 2H) , 3.69-3.74 (m, 1H) , 3.27-3.45 (m, 2H) , 2.80-3.12 (m, 4H) , 1.83-2.12 (m, 5H) , 1.34-1.47 (m, 1H) . MS (ESI) m/e [M+1] +410.
Compound 2.4 was separated into two stereoisomers (Compound 2.4a, earlier peak, and Compound 2.4b, later peak) by chiral prep-HPLC. The chiral separation conditions are shown below:
Compound 2.5: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
Compound 2.5was prepared according to the procedures described for Compound 2.4 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ7.11-7.16 (m, 2H) , 6.92-6.99 (m, 2H) , 6.55-6.93 (m, 1H) , 6.36 (s, 2H) , 6.17-6.19 (m, 1H) , 6.96 (s, 2H) , 5.64-5.69 (m, 1H) , 4.36-4.41 (m, 1H ) , 4.21-4.23 (m, 1H) , 4.04-4.07 (m, 1H) , 3.89-3.94 (m, 1H) , 3.72-3.79 (m, 1H ) , 3.45-3.47 (m, 2H) , 3.24-3.29 (m, 1H ) , 2.87-2.93 (m, 1H) , 2.12-2.15 (m, 1H) and 1.76 -1.83 (m, 4H) . MS (ESI) m/e [M+1] +410.
Compound 2.6: 1- (2-acrylamidobenzyl) -5-amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
Compound 2.6 was prepared according to the procedures described for Compound 1.20 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ10.16 (s, 1H) , 7.69 (d, J=8.0 Hz, 1H) , 7.29 (t, J=7.6Hz, 1H) , 7.11-7.17 (m, 3H) , 6.93-7.00 (m, 3H) , 6.49-6.64 (m, 3H) , 6.29-6.34 (m, 3H) , 5.81 (d, J =10.0 Hz, 1H) , 5.13 (s, 2H) , 4.36-4.40 (m, 1H) , 3.69-3.75 (m, 1H ) , 3.29-3.32 (m, 1H) , 2.89-3.07 (m, 2H) , 2.06 -2.15 (m, 2H) . MS (ESI) m/e [M+1] +432.
Compound 2.7: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
Step A: 4-Fluoro-2-hydroxybenzaldehyde
To the mixture of 3-fluorophenol (5 mL, 51 mmol) , anhydrous magnesium chloride (14.1 g, 372 mmol) in 250 mL of acetonitrile was added triethylamine (34 mL, 190 mmol) and paraforaldehyde (11 g, 372 mmol) . The mixture was then heated to reflux for 5 hours. After cooling to room temperature, 250 mL of 5% HCl. aq was added, extracted with EA (100 mL×2) . The combined organic layer was washed with 5% HCl. aq (100 mL×2) , brine, and dried over
Na2SO4, concentrated, purified by chromatography column to give the desired product (2.7 g) . 1H NMR (400 MHz, CDCl3) δ 11.36 (s, 1H) , 9.84 (s, 1H) , 7.54-7.58 (m, 1H) , 6.65-6.75 (m, 2H)
Step B: Ethyl 4- (5-fluoro-2-formylphenoxy) butanoate
A mixture of 4-fluoro-2-hydroxybenzaldehyde (2.7 g, 19.3 mmol) , ethyl 4-bromobutanoate (4.0 g, 20.5 mmol) and K2CO3 (3.5 g, 25.4 mmol) in DMF (30 mL) was heated to 80℃ for 2 hours, after cooling to room temperature, the mixture was poured into water (200 mL) , extracted with EA (100 mL×2) , the combined organic layer was washed with brine, dried over Na2SO4, concentrated and purified by column chromatography to give the product (4.8 g) . 1H NMR (400 MHz, DMSO-d6) δ10.26 (s, 1H) , 7.76 (dd, J=8.8, 7.2 Hz, 1H) , 7.15 (dd, J=11.6, 2.4 Hz, 1H) , 6.91 (dd, J=8.4, 2.0 Hz, 1H) , 4.17 (t, J=6.4 Hz, 2H) , 4.06 (q, J=7.2 Hz, 2H) , 2.49-2.51 (m, 2H) , 2.04-2.06 (m, 2H) , 1.17 (t, J=7.2 Hz, 3H) . MS (ESI) m/e [M+1] +255.
Step C: (E) -methyl 8-fluoro-2, 3-dihydrobenzo [b] oxepine-4-carboxylate
Ethyl 4- (5-fluoro-2-formylphenoxy) butanoate (3.81g, 15mmol) in dimethyl carbonate (30mL) was added CH3ONa (5.4 M in MeOH) (3.0mL, 15mmol) at 50℃. The reaction mixture was stirred at 50℃ for 3 hours. After cooling to room temperature, the mixture was quenched with EA (100mL) and H2O (100mL) , the organic layer was washed with brine (100mL) , dried over Na2SO4 and concentrated to give yellow oil as the crude product (w=3.0 g, Y=90%) . MS (ESI) m/e [M+1] +223.
Step D: Methyl 8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylate
(E) -methyl 8-fluoro-2, 3-dihydrobenzo [b] oxepine-4-carboxylate (3.0g, 13.5mmol) was dissolved in MeOH (30mL ) , then 10% Palladium on carbon (50% water wet, 5.0g) was added, the reaction mixture was hydrogenated with H2 gas at 1.5Mpa overnight. The catalyst was removed, the filtrate was concentrated to give yellow oil as the crude product (w=2.8 g, Y=93%) . MS (ESI) m/e [M+1] +225.
Step E: 8-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylic acid
To a solution of methyl 8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylate (2.8g , 12.5mmol) in MeOH/H2O (20mL/20mL) was added lithium hydroxide (1.76g, 62.5mmol) at 5℃-10 ℃, the mixture was stirred at room temperature for 3 hours. Then the solvent was removed by reduced pressure. The residue was acidized with 1N HCl adjust to pH=2-4, the precipitate was collected to give a white solid which was dried over infrared box (W=1.8g, Y=69%) . MS (ESI) m/e [M+1] +211.
Step F: 2- ( (8-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) (hydroxy) methylene) malononitrile
8-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylic acid (1.8g, 8.6mmol) was suspended in EA (50mL) , then HOBt (1.16g, 8.6mmol) was added, the mixture was stirred at RT
for 0.5 hour, then Et3N (1.74g, 17.2mmol) was added, the reaction mixture was stirred for another 0.5 hour, then EDCI (1.65g, 8.6mmol) was added. After the mixture was stirred for another 0.5 hour, malononitrile (577mg, 8.6mmol) was added. The reaction mixture was stirred at RT overnight. The reaction mixture was quenched with EA (150mL) , washed with H2O (100mL) , then the organic layer was stirred with aq H2SO4 (10g/100mL H2O) for 3 hours then directly concentrated to give yellow oil as the crude product (w=2.7 g, Y=100%) MS (ESI) m/e [M+1] +259.
Step G: 2- ( (8-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) (methoxy) methylene) malononitrile
2- ( (8-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) (hydroxy) methylene) malononitrile (2.70g, 10.5 mmol) was dissolved in trimethoxymethane (30mL) , the reaction mixture heated to 100℃ for 3 hours under N2 atmosphere. The solvent was removed by reduced pressure. The residue was purified by chromatography on silica gel usingEA/PE (1: 5-1: 2) as eluting solvent to givethe product (1.5g, Y=53%) as yellow oil. MS (ESI) m/e [M+1] +273.
Step H: 5-Amino-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4 -carboxamide
2- ( (8-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) (methoxy) methylene) malononitril e (1.5g, 5.5mmol) was dissolved in EtOH (10mL) , then hydrazine hydrate (1.38g, 27.5mmol ) was added at 5℃-10 ℃ for 0.1 hour. The reaction mixture was stirred at RT for 4 hours. The solvent was removed by reduced pressure to give the crude product, which was then suspended in
methanesulfonic acid (10mL) , the reaction mixture was heated to 85℃ for 0.5 hour and quenched with ice/H2O (100mL) , then neutralized with aq NaOH adjust to pH=7-9, extracted with EA (50mL×2) , then washed with brine (100mL) , dried over Na2SO4 and concentrated to give the product as a white solid (800 mg, Y=50%) . MS (ESI) m/e [M+1] +291.
Step I: (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin -4-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate:
5-Amino-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4 –carboxamide (290mg, 1mmol) , (S) -tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (710mg. 2mmol) and Cs2CO3 (650mg, 2mmol) were suspended in DMF (10mL) then the reaction mixture was heated to 70℃ overnight. After cooling to RT, the reaction mixture was quenched with EA (100mL) /H2O (50mL) , the organic layer was washed with brine (50mL) , dried over Na2SO4 and concentrated. The residue was purified by chromatography on silica gel usingEA as eluting solvent to give the desired product (200mg, Y=42%) as a white solid. MS (ESI) m/e [M+1] +474.
Step J: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
(3R) -tert-butyl3- (5-amino-4-carbamoyl-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate (200mg, 0.42mmol) was suspended in DCM/TFA (3mL/1mL) , the reaction mixture was stirred at RT for 2 hours and the solvent was
removed by reduced pressure. The residue was dissolved in CH3CN/H2O, then NaHCO3 (84mg, 1.26mmol) and acryloyl chloride (38mg, 0.42mmol) was added. The reaction mixture was stirred at RT for 3 hours, then quenched with EA (50mL) /H2O (50mL) , the organic layer was washed with brine, dried over Na2SO4 and concentrated. The residue was purified by prep-HPLC to give a white solid (w=30mg, Y=17%) . 1H NMR (400 MHz, DMSO-d6) δ 7.16-7.20 (m, 1H) , 6.78-6.83 (m, 3H) , 6.60 (s, 2H) , 6.05-6.10 (m, 3H) , 5.63-5.71 (m, 1H) , 4.38 -4.41 (m, 1H) , 3.74-4.06 (m, 3H ) , 3.27-3.29 (m, 1H) , 2.67-2.83 (m, 4H ) , 1.83-2.11 (m, 5H) and 1.23 (m, 1H) . MS (ESI) m/e [M+1] +428.
Compound 2.8: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (8-fluoro -2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
Step A: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
5-Amino-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4–carboxamide (the product of step H in synthesis of Compound 2.7, 500mg, 1.72mmol) ,
(S) -tert-butyl 2- (tosyloxymethyl) pyrrolidine-1-carboxy late (BL-2, 1.22g. 3.44mmol) and Cs2CO3 (1.22g, 2mmol) were suspended in DMF (10mL) , then the reaction mixture was heated to 70℃ overnight. After cooling to RT, the reaction mixture was quenched with EA (100mL) /H2O (50mL) , the organic layer was washed with brine (50mL) , dried over Na2SO4 and concentrated. The residue was purified by chromatography on silica gel usingEA: PE (1: 1-50: 1) as eluting solvent to give product (250mg, Y=31%) as white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.16-7.20 (br. s, 1H) , 6.78-6.83 (m, 2H) , 6.56 (s, 2H) , 6.04 (s, 2H) , 4.3 -4.42 (m, 1H) , 3.74-3.95 (m, 3H ) , 3.27-3.29 (m, 2H) , 2.94-3.18 (m, 4H ) , 2.10 (m, 2H) , 1.72 (m, 3H) and 1.23 (m, 9H) . MS (ESI) m/e [M+1] +474.
Step B: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
(2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (8-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate (250mg, 0.53mmol) was suspended in DCM/TFA (3mL/1mL) , the reaction mixture was stirred at RT for 2 hours. Then the solvent was removed by reduced pressure. The residue was dissolved in CH3CN/H2O, NaHCO3 (89mg, 1.06mmol) and acryloyl chloride (48mg, 0.53mmol) were added. The reaction mixture was stirred at RT for 2 hours, and quenched with EA (50mL) /H2O (50mL) , the organic layer was washed with brine (50mL) , dried over Na2SO4 and concentrated. The residue was purified by prep-HPLC to give the product (w=80mg, Y=35%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 7.15-7.18 (m, 1H) , 6.70-6.83 (m, 2H) , 6.51-6.62 (m, 3H) , 6.05-6.22 (m, 3H) , 5.48-5.74 (m, 1H) , 4.38-4.41 (m, 1H) , 3.77-4.17 (m, 4H) , 3.31-3.49 (m, 3H) , 2.95-3.01 (m, 2H) , 2.08-2.11 (m, 2H) and 1.78-1.79 (m, 4H) . MS (ESI) m/e [M+1] +428.
Compound 2.9: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
Step A: methyl 4- (4-fluoro-2-formylphenoxy) butanoate
To a solution of 5-fluoro-2-hydroxybenzaldehyde (42g, 0.3mol) and ethyl 4-bromobutanoate (58.5g, 0.3mol) in DMF (500mL) were added Cs2CO3 (117g, 0.36mol) at room temperature for 1 hour, the reaction mixture was stirred at room temperature for 3 hours. The reaction mixtures was quenched with EA (600mL) and H2O (1500mL) , the organic layer was washed with brine (500mL×2) , dried over Na2SO4 and concentrated to give product as yellow oil (W=75g, Y=98%) , which was used to the next step without further purification. MS (ESI) m/e [M+1] +241.
Step B: methyl 7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylate
To a solution of methyl 4- (4-fluoro-2-formylphenoxy) butanoate (75g, 135mmol) in dimethyl carbonate (1000mL) was added CH3ONa (5.4 M in MeOH) (60mL, 325mmol) at 50℃. The reaction mixture was stirred at 50℃ for 2 hours. The mixture was quenched with EA (500mL)
and H2O (500mL) , the organic layer was washed with brine (500mL) and concentrated. The residue was dissolved with MeOH (500 mL) , 10% Palladium on carbon (50% water wet, 6.5g) was added. The reaction mixture was hydrogenated with H2 gas at 1.5Mpa overnight. The catalyst was removed, the filtrate was concentrated to givetheproduct (50.0g, Y=68%) as yellow oil, which was used to the next step without further purification. MS (ESI) m/e [M+1] +225.
Step C: 7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylic acid
To a solution of methyl 7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylate (50g , 223mmol) in MeOH/H2O (500mL/100mL) was added lithium hydroxide (17.86g, 446mmol) at 5℃-10 ℃, the mixture was stirred at room temperature overnight. Then the solvent was removed by reduced pressure. The residue was acidized with 6N HCl adjust to pH=3-4, extracted with EA (500mL×2) , the organic layer was washed with brine (500mL) , dried over Na2SO4 and concentrated to give the crude product (W=31g, Y=67%) as a white solid. MS (ESI) m/e [M+1] +211.
Step D: 2- ( (7-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) (hydroxy) methylene) malononitrile
7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepine-4-carboxylic acid (31g, 147.6mmol) was suspended in EA (200mL) , then HOBt (19.9g, 147.6mmol) was added. The mixture was stirred at RT for 0.5 hour, then Et3N (44.7g, 443mmol) was added. The reaction mixture was stirred for another 0.5 hour, then EDCI (28.3g, 147.6mmol) was added. After the mixture was stirred for another 0.5 hour, malononitrile (9.74g, 147.6mmol) was added. The reaction mixture was stirred at RT overnight. The reaction mixture was quenched with EA (200mL) , washed with H2O
(100mL) , and the organic layer was stirred with aq H2SO4 (40g/400mL H2O) for 3 hours then directly concentrated to give the crude product (w=21 g, Y=55%) as yellow oil. MS (ESI) m/e [M+1] +259.
Step E: 5-amino-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4 -carboxamide
2- ( (7-Fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) (hydroxy) methylene) malononitrile (21g, 81.4 mmol) was dissolved in trimethoxymethane (150mL) , the reaction mixture was heated to 100℃ for 4 hours under N2 atmosphere. After cooling to RT, the solvent was removed by reduced pressure. The residue was purified by chromatography on silica gel usingEA: PE (1: 5-1: 2) as eluting solvent to give intermediate compound (18g, Y=82%) as a white solid. Then the compound was dissolved in EtOH (100mL) , hydrazine hydrate (8.14g, 162.8mmol) was added at 5℃-10 ℃ for 0.1 hour. The reaction mixture was stirred at RT for 4 hours. The solvent was removed by reduced pressure to give the product (16g, two steps Y=73%) as a yellow solid. MS (ESI) m/e [M+1] +273.
Step F: 5-Amino-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
5-Amino-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4–carboxamide (16g, 59mmol) was suspended in methanesulfonic acid (60mL) , the reaction mixture
was heated to 85℃ for 0.5 hour. After cooling to RT, the reaction mixture was quenched with ice/H2O (500mL) , then neutralized with aq NaOH adjust to pH=7-9, extracted with EA (250mL×2) , then washed with brine (200mL) , dried over Na2SO4 and concentrated. The residue was purified by chromatography on silica gel usingEA: MeOH (100: 1-50: 1) as eluting solvent to give product (9.0g, Y=57%) as white solid. 1H NMR (400 MHz, DMSO-d6) δ 11.59 (br. s, 1H) , 6.91-7.04 (m, 3H) , 6.60 (s, 2H) , 5.49 (br. s, 2H) , 4.36-4.39 (m, 1H) , 3.60-3.65 (m, 1H) , 3.04-3.10 (m, 1H ) , 2.80-2.91 (m, 1H ) , 2.06-2.16 (m, 2H) and 0.82-0.85 (m, 1H) . MS (ESI) m/e [M+1] +291.
Step G: (3R) -tert-butyl 3- (5-amino-4-carbamoyl-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin -4-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate:
5-Amino-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4–carboxa mide (1.5g, 5.17mmol) , (s) -tert-butyl 3- (tosyloxy) piperidine-1-carboxylate (BL-1, 3.67g. 10.34mmol) and Cs2CO3 (3.38g, 10.34mmol) were suspended in DMF (20mL) . The reaction mixture was heated to 80℃ overnight under N2 atmosphere. After cooling to RT, the mixture was quenched with EA (100mL) /H2O (100mL) , the organic layer was washed with brine (100mL) , dried over Na2SO4 and concentrated. The residue was purified by chromatography on silica gel usingEA: MeOH (100: 1-50: 1) as eluting solvent to give the product (800mg, Y=33%) as white solid. 1H NMR (400 MHz, DMSO-d6) δ 6.94-7.00 (m, 3H) , 6.58 (s, 2H) , 6.21 (s, 2H) , 4.32-4.35 (m, 1H) , 4.04-4.08 (m, 1H ) , 3.70-3.89 (m, 3H) , 3.30-3.34 (m, 1H ) , 2.67-3.03 (m, 3H) , 1.83-2.11 (m, 5H) , and 1.36-1.39 (m, 11H) . MS (ESI) m/e [M+1] +474.
Step H: 1- ( (R) -1-acryloylpiperidin-3-yl) -5-amino-3- (7-fluoro-2, 3, 4, 5-tetrahydro benzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
(3R) -tert-butyl3- (5-amino-4-carbamoyl-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazol-1-yl) piperidine-1-carboxylate (800mg, 1.69mmol) was suspended in DCM/TFA (3mL/1mL) , the reaction mixture was stirred at RT for 2 hours. The solvent was removed by reduced pressure. The residue was dissolved in CH3CN/H2O (12mL/12mL) , then NaHCO3 (286mg, 3.4mmol) and acryloyl chloride (183mg, 2.02mmol) was added. The reaction mixture was stirred at RT for 3 hours, then quenched with EA (50mL) /H2O (50mL) , the organic layer was washed with brine, dried over Na2SO4 and concentrated. The residue was purified by prep-HPLC to give a white solid (w=200mg, Y=28%) . 1H NMR (400 MHz, DMSO-d6) δ 6.73-7.03 (m, 4H) , 6.59 (s, 2H) , 6.05-6.21 (m, 3H) , 5.61-5.71 (m, 1H) , 3.95-4.36 (m, 3H) , 3.68-3.70 (m, 1H ) , 3.27-3.42 (m, 2H) , 2.82-3.11 (m, 4H) , 1.83-2.09 (m, 5H) and 1.23 (m, 1H) . MS (ESI) m/e [M+1] +428
Compound 2.10: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3-(7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
Step A: (2S) -tert-butyl 2- ( (5-amino-4-carbamoyl-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate
5-Amino-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4 –carboxamide (the product of step F in synthesis of Compound 2.9, 1.5g, 5.17mmol) , (s) -tert-butyl 2- (tosyloxymethyl) pyrrolidine-1-carboxy late (3.67g, 10.34mmol) and Cs2CO3 (3.36g, 10.34mmol) were suspended in DMF (20mL) , the reaction mixture was heated to 70℃ for overnight. The reaction mixture was quenched with EA (100mL) /H2O (50mL) , the organic layer was washed with brine (50mL) , dried over Na2SO4 and concentrated. The residue was purified by chromatography on silica usingEA: Pet (1: 1-50: 1) as eluting to give product (900mg, Y=37%) as white solid. 1H NMR (400 MHz, DMSO-d6) δ 6.93-6.95 (m, 3H) , 6.58 (s, 2H) , 6.03 (s, 2H) , 4.34 -4.46 (m, 2H) , 3.71-3.86 (m, 3H ) , 2.89-3.07 (m, 5H ) , 1.71-1.93 (m, 6H) and 1.23 (m, 9H) . MS (ESI) m/e [M+1] +474.
Step B: 1- ( ( (S) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazole-4-carboxamide
(2S) -tert-butyl-2- ( (5-amino-4-carbamoyl-3- (7-fluoro-2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1H-pyrazol-1-yl) methyl) pyrrolidine-1-carboxylate (900mg, 1.9mmol) was suspended on DCM/TFA (5mL/2mL) , the reaction mixture was stirred at RT for 2 hours. The solvent was removed by reduced pressure. The residue was dissolved in CH3CN/H2O (12mL/12mL) , then NaHCO3 (319mg, 3.8mmol) and acryloyl chloride (206mg, 2.28mmol) were added. The reaction mixture was stirred at RT for 2 hours, then quenched with EA (50mL) /H2O (50mL) , the organic layer was washed with brine (50mL) , dried over Na2SO4 and concentrated.
The residue was purified by prep-HPLC to give the product (w=300mg, Y=37%) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ 6.91-7.01 (m, 3H) , 6.50-6.70 (m, 3H) , 6.02-6.23 (m, 3H) , 5.49-5.74 (m, 1H) , 4.33 -4.39 (m, 2H) , 3.27-3.91 (m, 6H) , 2.87-3.04 (m, 2H) , 2.08-2.11 (m, 2H) and 1.78-1.79 (m, 4H) . MS (ESI) m/e [M+1] +428.
Compound 2.11: 1- ( ( (R) -1-acryloylpyrrolidin-2-yl) methyl) -5-amino-3- (2, 3, 4, 5-tetrahydrobenzo [b] oxepin-4-yl) -1 H-pyrazole-4-carboxamide
Compound 2.11 was prepared according to the procedures described for Compound 2.5 under appropriate conditions that could be recognized by one skilled in the art.
1H NMR (400 MHz, DMSO-d6) δ 7.11-7.16 (m, 2H) , 6.92-6.99 (m, 2H) , 6.57-6.60 (m, 3H) , 6.14-6.23 (m, 3H) , 5.65-5.74 (m, 1H) , 4.37-4.41 (m, 1H) , 4.17-4.18 (m, 1H) , 3.89-4.03 (m, 2H) , 3.71 -3.74 (m, 1H) , 3.26-3.43 (m, 3H) , 2.89-3.02 (m, 2H) , 2.10-2.13 (m, 2H ) and 1.79 -1.83 (m, 4H) . MS (ESI) m/e [M+1] +410
EGFR enzymatic assay
Compounds of the present invention were tested against WT EGFR kinase domain (aa. 669-1210, Carna Biosciences, 08-115) , EGFR T790M/L858R kinase domain (aa. 669-1210, Carna Biosciences, 08-510) and EGFR L858R kinase domain (aa. 669-1210, Carna Biosciences, 08-502) in assays based on time-resolved fluorescence-resonance energy transfer methodology. The assay was carried out in 384-well low volume black plate in a reaction mixture containing EGFR kinases, 20 μMATP for EGFR WT and T790M/L858R, and 125 μM
for EGFR L858R, biotin-TK substrate and 0-0.5 μM compounds in buffer containing 50 mM HEPES pH7.5, 10 mM MgCl2, 1 mM EGTA, 0.01% Brij-35, 2.5 mM DTT, 0.1% BSA. The kinase was incubated with compounds of the present invention at room temperature for 120 minutes and the reaction was initiated by the addition of ATP and biotin-TK substrate. After reaction at room temperature for 40 minutes, an equal volume of stop/detection solution was added according to the manufacture’s instruction (CisBio Bioassays) . The stop/detection solution contained TK-Antibody-Cryptate and Streptavidin-XL665 in buffer containing 25 mM Tris pH7.4, 400 mM KF, 50 mM EDTA, 0.01% BSA, 0.01% Triton X-100. Plates were sealed and incubated at room temperature for 1 hour, and the TR-FRET signals were read on BMG PHERAstar FS instrument. The IC50 of an inhibitor was derived from fitting the %inhibition data at each compound concentration to the four-parameter logistic equation by Graphpad Prism software.
Compounds 1.1-1.67 and 2.1-2.11 inhibit EGFR kinases with IC50 values ranging from 0.01 nM to 1 μM.
Table 1: the IC50 values (nM) of the compounds of the present invention for inhibiting EGFR kinases
The foregoing invention has been described in some detail by way of illustration and example, for purposes of clarity and understanding. It will be obvious to one of skill in the art that changes and modifications may be practiced within the scope of the appended claims. Therefore, it is to be understood that the above description is intended to be illustrative and not restrictive. The scope of the invention should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the following appended claims, along with the full scope of equivalents to which such claims are entitled.
All patents, patent applications and publications cited in this application are hereby incorporated by reference in their entirety for all purposes to the same extent as if each individual patent, patent application or publication were so individually denoted.
Claims (31)
- At least one compound selected from compounds of Formula (I)stereoisomers thereof, and pharmaceutically acceptable salts thereof,wherein:R1, R2 and R3 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl;R4 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;L is a linking group selected from a bond, - (CR5R6) n-, S, -O-, and -NR8-, wherein n is an integer of 1, 2, or 3;W is selected from aryl or heteroaryl, said aryl or heteroaryl is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R”, NR'COR”, NR'SO2R”, CONR'R”, COOR', SO2R' , C1-6alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl; orW and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring optionally containing a further heteroatom selected from NR8, O and S, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R”, NR'COR”, NR'SO2R”, CONR'R”, COOR', SO2R', C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl;R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;Y is selected from -CR5R6-and -O-;Z is selected from - (CR5R6) m-, -CR5R6-O-, -O-, and -NR'-, wherein m is an integer of 1 or 2;R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl;R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;R'and R”, at each occurrence, are independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl; and*is a chiral center.
- The compound according to Claim 1, wherein R1, R2, and R3 are hydrogen.
- The compound according to Claim 1, wherein R4 is hydrogen.
- The compound according to Claim 1, wherein L is a bond, and W is aryl or heteroaryl.
- The compound according to Claim 4, wherein L is a bond, and W is a phenyl or pyridyl group.
- The compound according to Claim 1, wherein L is - (CR5R6) n-, and W is aryl or heteroaryl, wherein n is an integer of 1, 2, or 3, and R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 6, wherein L is - (CR5R6) n-, and W is a phenyl or pyridyl group, wherein n is an integer of 1, 2, or 3, and R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 7, wherein L is -CH2-, and W is a phenyl or pyridyl group.
- The compound according to Claim 1, wherein L is a bond or - (CR5R6) n-, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring optionally containing a further heteroatom selected from NR8, O and S, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R”, NR'COR”, NR'SO2R”, CONR'R”, COOR', SO2R', C1-6alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl, wherein R5, R6, R8, R', R”and n are defined as above.
- The compound according to Claim 9, wherein L is a bond or - (CR5R6) n-, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl, pyrrolidinyl, piperidinyl, and morpholinyl, and wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyll; and n is an integer of 1, 2, or 3.
- The compound according to Claim 9, wherein L is a bond, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl, pyrrolidinyl, piperidinyl, and morpholinyl.
- The compound according to Claim 9, wherein L is -CH2-, and W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl, pyrrolidinyl, piperidinyl, and morpholinyl.
- The compound according to Claim 1, wherein Y is -O-, and Z is -O-.
- The compound according to Claim 1, wherein Y is -O-, and Z is -NR'-, wherein R'is independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 1, wherein Y is -CR5R6-, and Z is -NR'-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl ; and R'is independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 1, wherein Y is -CR5R6-, and Z is -CR5R6-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 1, wherein Y is -CR5R6-, and Z is -O-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 1, wherein Y is -CR5R6-, Z is - (CR5R6) 2-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 1, wherein Y is -CR5R6-, and Z is -CR5R6O-, wherein R5 and R6 are independently selected from hydrogen, halo, C1-6 alkyl, and C1-6 haloalkyl.
- The compound according to Claim 1, which is a compound of Formula (I-1) :stereoisomers thereof, and pharmaceutically acceptable salts thereof,wherein:R4 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;L is a linking group selected from a bond, or -CH2 -;W is selected from phenyl or pyridyl; orR7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;Y is selected from -CH2-and -O-;Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and*is a chiral center.
- The compound according to Claim 1, which is a compound of Formula (I-2) :stereoisomers thereof, and pharmaceutically acceptable salts thereof,wherein:L is a bond or -CH2-,W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl, pyrrolidinyl, piperidinyl, and morpholinyl, said heterocyclic ring is optionally substituted by 1, 2, or 3 substituents selected from the group consisting of halogen, CN, NO2, OR8, NR'R”, NR'COR”, NR'SO2R”, CONR'R”, COOR', SO2R', C1-6alkyl, C2-6 alkenyl, C2-6 alkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, and heteroaryl;R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4; R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;R'and R”, at each occurrence, are independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;Y is selected from -CH2-and -O-;Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and*is a chiral center.
- The compound according to Claim 21, wherein:L is a bond or -CH2-,W and R4 taken together with the nitrogen to which they are attached form a 4-, or 5-, or 6-membered heterocyclic ring selected from the group consisting of azetidinyl selected from pyrrolidinyl selected frompiperidinyl selected from and morpholinyl selected fromand wherein the wavy lines represent points of attachment to the linking group L, and the acryloyl group on the nitrogen atom is omitted,R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;Y is selected from -CH2-and -O-;Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and*is a chiral center.
- The compound according to Claim 21, wherein the carbon atom to which the linking group L is attached to the 4-, or 5-, or 6-membered heterocyclic ring formed by W and R4 taken together with the nitrogen atom is (R) or (S) configuration.
- The compound according to Claim 1, which is a compound of Formula (I-3) :stereoisomers thereof, and pharmaceutically acceptable salts thereof,wherein:R7, at each occurrence, is independently selected from hydrogen, halo, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, and C1-6 haloalkoxy; and wherein p is an integer of 0, 1, 2, 3, or 4;Y is selected from -CH2-and -O-;Z is selected from -CH2-, -CH2CH2-, -CH2O-, -O-, and -NMe-; and*is a chiral center.R9 is selected fromF, Cl, Br, OR8, NR'R”, O- (CH2) n-NR'R”;n = 1, 2, 3;R8 is selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;R'and R”, at each occurrence, are independently selected from hydrogen, C1-6 alkyl, and C1-6 haloalkyl;
- A pharmaceutical composition comprising at least one pharmaceutically acceptable carrier and at least one compound according to any one of Claims 1-26, or stereoisomers thereof, or pharmaceutically accept salts thereof.
- A use of at least one compound according to any one of Claims 1-26 or stereoisomers thereof, or pharmaceutically accept salts thereof in manufacture of a medicament for inhibiting EGFR-T790M kinase.
- A use of at least one compound according to any one of Claims 1-26 or stereoisomers thereof, or pharmaceutically accept salts thereof in the manufacture of a medicament for treating cancer selecting from the group consisting of ovarian cancer, cervical cancer, colorectal cancer, breast cancer, pancreatic cancer, glioma, glioblastoma, melanoma, prostate cancer, leukaemia, lymphoma, non-Hodgkins lymphoma, gastric cancer, lung cancer including non-small cell lung cancer, hepatocellular cancer, gastric cancer, gastrointestinal stromal tumour (GIST) , thyroid cancer, bile duct cancer, endometrial cancer, renal cancer, anaplastic large cell lymphoma, acute myeloid leukaemia (AML) , multiple myeloma, melanoma and mesothelioma.
- A method of treating cancer responsive to inhibition of T790M-EGFR kinase comprising administering to a subject in recognized need thereof a therapeutically effective amount of at least one compound of any one of Claims 1-26 or stereoisomers thereof, or pharmaceutically accept salts thereof.
- A method of treating cancer responsive to inhibition of T790M-EGFR kinase comprising administering to a subject in recognized need thereof a therapeutically effective amount of at least one compound of any one of Claims 1-26 or stereoisomers thereof, or pharmaceutically accept salts thereof, wherein the cancer is selected from the group consisting of ovarian cancer, cervical cancer, colorectal cancer, breast cancer, pancreatic cancer, glioma, glioblastoma, melanoma, prostate cancer, leukaemia, lymphoma, non-Hodgkins lymphoma, gastric cancer, lung cancer including non-small cell lung cancer, hepatocellular cancer, gastric cancer, gastrointestinal stromal tumour (GIST) , thyroid cancer, bile duct cancer, endometrial cancer, renal cancer, anaplastic large cell lymphoma, acute myeloid leukaemia (AML) , multiple myeloma, melanoma and mesothelioma.
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CN109563099A (en) * | 2016-08-16 | 2019-04-02 | 百济神州有限公司 | (S) -7- (1- acryloylpiperidine -4- base) -2- (4- Phenoxyphenyl) -4,5,6,7- tetrahydro-pyrazole simultaneously crystal form of [1,5-A] pyrimidine -3- formamide, its preparation and use |
WO2019154956A1 (en) | 2018-02-08 | 2019-08-15 | Enyo Pharma | Non-fused thiophene derivatives and their uses |
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