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Read all about Organic Spectroscopy on ORGANIC SPECTROSCOPY INTERNATIONAL 

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DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with GLENMARK PHARMACEUTICALS LTD, Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 30 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, Dr T.V. Radhakrishnan and Dr B. K. Kulkarni, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 30 year tenure till date Dec 2017, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 9 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 50 Lakh plus views on dozen plus blogs, He makes himself available to all, contact him on +91 9323115463, email, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 19 lakh plus views on New Drug Approvals Blog in 216 countries...... , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc

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2D chemical structure of 1802425-99-5



Molecular Formula,C28-H23-Cl2-F2-N9-O2

Molecular Weight, 626.4441

BMS-986177, JNJ-70033093; JNJ-3093, WHO 11401

CAS 1802425-99-5


Prevention and Treatment of Thromboembolic Disorders

Milvexian, also known as BMS-986177, is a blood coagulation factor XIa inhibitor.Bristol-Myers Squibb , in collaboration with  Janssen , is developing milvexian (BMS-986177, JNJ-70033093; JNJ-3093), an antithrombotic factor XIa (FXIa) inhibitor, for the oral prevention and treatment of thrombosis.



Process for preparing milvexian as FXIa and/or plasma kallikrein inhibitors useful for treating deep vein thrombosis, stroke, and atherosclerosis.

(9i?,13ri)-13-{4-[5-chloro-2-(4-chloro- 1 //- 1 2.3-triazol- 1 -yl)phenyl |-6-o\o- 1 6-dihydropyri midin- 1 -yl }-3-(difluoromethyl)-9-methyl-3,4,7,15-tetraazatricyclo[ (5]octadeca-l(18),2(6),4,14,16-pentaen-8-one, has the structure of Formula (I):






product case WO2016053455 novel macrocyclic compounds are FXIa and/or plasma kallikrein inhibitors.

Scheme 1


1c 1a

Scheme 2


Scheme 3


Example 1. Preparation of (9i?,135)-13-{4-[5-chloro-2-(4-chloro-lH-l,2,3-triazol-l-yl)phenyl]-6-oxo- 1 ,6-dihydropyrimidin- 1 -yl} -3-(difluoromethyl)-9-methyl-3,4,7, 15-tetraazatricyclo[] -8-one trifluoroacetate

1A. Preparation of l-(difluoromethyl)-4-nitro-lH-pyrazole

CS2CO3 (14.41 g, 44.2 mmol) was suspended in a solution of 4-nitro-lH-pyrazole (5.00 g, 44.2 mmol) and DMF (40 mL). After heating to 120 °C for 5 min, solid sodium 2-chloro-2,2-difluoroacetate (13.48 g, 88 mmol) was added in 10 equal portions over 20 min. The reaction was complete after 10 min of additional heating. The mixture was added to a separatory funnel containing 100 mL water and extracted with Et20 (2 x 50 mL). The combined organic layers were concentrated. Purification by normal-phase chromatography eluting with a gradient of hexanes/EtOAc yielded l-(difluoromethyl)-4-nitro-lH-pyrazole (6.99 g, 42.9 mmol, 97% yield) as a clear, colorless oil. 1H NMR (500MHz, CDCI3) δ 8.58 (s, 1H), 8.22 (s, 1H), 7.39 – 7.05 (t, J= 60 Hz, 1H).

IB. Preparation of (S)-tert-butyl (l-(4-(l-(difluoromethyl)-4-nitro-lH-pyrazol-5-yl)pyridin-2-yl)but-3 -en- 1 -yl)carbamate

To a N2 flushed, 500 mL RBF was added {S)-tert-bvXy\ (l-(4-chloropyridin-2-yl)but-3-en-l-yl)carbamate, prepared as described in Example 3, (10 g, 35.4 mmol), 1-(difluoromethyl)-4-nitro-lH-pyrazol (6.34 g, 38.9 mmol) and dioxane (100 mL). The solution was bubbled with N2 for 5 min. Then Pd(OAc)2 (0.40 g, 1.7 mmol),

di(adamantan-l-yl)(butyl)phosphine (1.27 g, 3.5 mmol), K2CO3 (14.7 g, 106 mmol) and PvOH (1.08 g, 10.61 mmol) were added. The reaction mixture was bubbled with N2 for 5 min then the reaction mixture was heated to 100 °C for 3 h. After this time, the solution was cooled to rt and water (200 mL) was added. The reaction mixture was then extracted with EtOAc (2 x 200 mL). The combined organic extracts were washed with water (200 mL), brine (200 mL), dried over Na2S04, filtered and concentrated in vacuo. Purification by normal phase chromatography eluting with a gradient of hexanes/EtOAc afforded (S)-tert-butyl ( 1 -(4-( 1 -(difluoromethyl)-4-nitro- lH-pyrazol-5 -yl)pyridin-2-yl)but-3 -en- 1 -yl)carbamate (12.91 g, 31.5 mmol, 89% yield) as a slightly yellow oil. MS(ESI) m/z: 410.4 [M+H]+. 1H NMR (400MHz, CDC13) δ 8.80 (dd, J=5.1, 0.7 Hz, 1H), 8.36 (s, 1H), 7.34 (s, 1H), 7.31 (dd, J=5.1, 1.5 Hz, 1H), 7.27 – 6.91 (t, J=58 Hz, 1H), 5.79 – 5.63 (m, 1H), 5.16 – 5.03 (m, 2H), 4.92 (d, J=5.9 Hz, 1H), 2.67 (t, J=6.4 Hz, 2H), 1.46 (br. s., 9H).

1C. Preparation of 
(l-(4-(4-amino-l -(difluoromethyl)- lH-pyrazol-5-yl)pyridin-2-yl)but-3 -en- 1 -yl)carbamate

To a 100 mL, 3-necked RBF was added a solution of (S)-tert-butyl (l-(4-(l-(difluoromethyl)-4-nitro-lH-pyrazol-5-yl)pyridin-2-yl)but-3-en-l-yl)carbamate (0.78 g, 1.90 mmol) in MeOH (12 mL) and a solution of NH4C1 (1.02 g, 19 mmol) in water (3 mL). To the solution was added Fe (0.53 g, 9.49 mmol). The reaction mixture was heated to 65 °C for 3 h. Water (50 mL) was added. After cooling to rt, the mixture was filtered through a CELITE® pad and rinsed with MeOH (200 mL). The filtrate was concentrated in vacuo. The residue was partitioned between EtOAC (100 mL) and water (100 mL). The organic phase was separated, washed with water (100 mL), brine (100 mL), dried over Na2S04, filtered and concentrated in vacuo. Purification by normal phase chromatography eluting with a gradient of DCM/MeOH yielded (S)-tert-butyl (l-(4-(4-amino- 1 -(difluoromethyl)- lH-pyrazol-5 -yl)pyridin-2-yl)but-3 -en- 1 -yl)carbamate (0.585 g, 1.54 mmol, 81% yield) as an oil. MS(ESI) m/z: 380.1 [M+H]+. 1H NMR (400MHz,

CDC13) δ 8.70 (dd, J=5.0, 0.7 Hz, 1H), 7.43 (s, 1H), 7.36 (s, 1H), 7.32 (dd, J=5.1, 1.5 Hz, 1H), 7.28 – 6.97 (t, J=58 Hz, 1H), 5.80 – 5.66 (m, 1H), 5.65 – 5.53 (m, 1H), 5.13 – 5.03 (m, 2H), 4.87 (br. s., 1H), 3.22 (br. s., 2H), 2.65 (t, J=6.5 Hz, 2H), 1.52 – 1.37 (m, 9H).

ID. Preparation of tert-butyl ((5)-l-(4-(l-(difiuoromethyl)-4-((i?)-2-methylbut-3-enamido)- lH-pyrazol-5-yl)pyridin-2-yl)but-3-en- 1 -yl)carbamate

To a N2 flushed, 3 -necked, 250 mL RBF was added a solution of {S)-tert-bvXy\ (1-(4-(4-amino-l-(difluoromethyl)-lH-pyrazol-5-yl)pyridin-2-yl)but-3-en-l-yl)carbamate (5 g, 13.18 mmol) and EtOAc (50 ml). The solution was cooled to -10 °C and (R)-2-methylbut-3-enoic acid, as prepared in Example 2, (1.72 g, 17.13 mmol), pyridine (4.26 ml, 52.7 mmol). and T3P® (23.54 ml, 39.5 mmol) were added. The cooling bath was removed and the solution was allowed to warm to rt and then stir over a period of 20 h. Water (30 mL) and EtOAc (30 mL) were added and the mixture was stirred for 30 min. The organic phase was separated and the aqueous layer was extracted with EtOAc (30 mL). The combined organic extracts were washed with brine (50 mL), dried over

Na2SC”4, filtered and concentrated in vacuo. Purification by normal phase

chromatography eluting with a gradient of hexanes/EtOAc gave tert-butyl ((5)-l-(4-(l-(difluoromethyl)-4-((i?)-2-methylbut-3-enamido)-lH-pyrazol-5-yl)pyridin-2-yl)but-3-en-l-yl)carbamate (5.69 g, 12.33 mmol, 94% yield). MS(ESI) m/z: 462.2 [M+H]+. 1H NMR (400MHz, CDC13) δ 8.75 (dd, J=5.0, 0.6 Hz, 1H), 8.37 (s, 1H), 7.32 (t, J=59 Hz, 1H), 7.28 (br. s., 1H), 7.20 (s, 1H), 5.97 – 5.85 (m, 1H), 5.78 – 5.65 (m, 1H), 5.56 – 5.44 (m, 1H), 5.28 – 5.19 (m, 2H), 5.12 (d, J=2.0 Hz, 2H), 4.91 – 4.82 (m, 1H), 3.20 – 3.11 (m, 1H), 2.72 – 2.62 (m, 2H), 1.48 – 1.43 (s, 9H), 1.33 (d, J=6.8 Hz, 3H).

IE. Preparation of tert-butyl N-[(9i?,10E,135)-3-(difluoromethyl)-9-methyl-8-oxo-3,4,7,15-tetraazatricyclo[]octadeca-l(18),2(6),4,10,14,16-hexaen-13-yl] carbamate

To a N2 flushed, 2 L, 3 -necked, RBF was added a solution of tert-butyl ((S)-l-(4-(1 -(difluoromethyl)-4-((i?)-2-methylbut-3 -enamido)- lH-pyrazol-5 -yl)pyridin-2-yl)but-3 -en-l-yl)carbamate (3 g, 6.50 mmol) in EtOAc (1300 ml). The solution was sparged with argon for 15 min. Grubbs II (1.38 g, 1.63 mmol) was added in one portion. The reaction mixture was heated to reflux for 24 h. After cooling to rt, the solvent was removed and the residue was purified by normal phase chromatography eluting with a gradient of DCM/MeOH to yield tert-butyl N-[(9R, 10E, 135)-3-(difluoromethyl)-9-methyl-8-oxo-3,4,7,15-tetraazatricyclo[]octadeca-l(18),2(6),4,10,14,16-hexaen-13-yl]carbamate (2.13 g, 4.91 mmol, 76% yield) as a tan solid. MS(ESI) m/z: 434.4 [M+H]+. 1H NMR (400MHz, CDC13) δ 8.71 (d, J=5.1 Hz, 1H), 7.78 (s, 1H), 7.44 – 7.40 (m, 1H), 7.36 (br. s., 1H), 7.27 (t, J=58 Hz, 1H), 6.87 (s, 1H), 6.49 – 6.39 (m, 1H), 5.78 (s, 1H), 4.80 (br. s., 2H), 3.18 – 3.08 (m, 1H), 3.08 – 2.98 (m, 1H), 2.06 – 1.93 (m, 1H), 1.51 (s, 9H), 1.19 (d, J=6.6 Hz, 3H).

IF. Preparation of tert-butyl N-[(9i?,135)-3-(difluoromethyl)-9-methyl-8-oxo-3,4,7,15-tetraazatricyclo[]octadeca-l(18),2(6),4,14,16-pentaen-13-yl]carbamate

Pd/C (0.60 g, 0.570 mmol) was added to a 250 mL Parr hydrogenation flask containing a solution of tert-butyl N-[(9i?,10E,135)-3-(difluoromethyl)-9-methyl-8-oxo-3,4,7,15-tetraazatricyclo[]octadeca-l(18),2(6),4,10,14,16-hexaen-13-yljcarbamate (2.46 g, 5.68 mmol) in EtOH (100 mL). The flask was purged with N2 and pressurized to 55 psi of H2 allowed to stir for 18 h. The reaction was filtered through CELITE® and concentrated to yield tert-butyl N-[(9i?,135)-3-(difluoromethyl)-9-methyl-8-oxo-3,4,7,15-tetraazatricyclo[]octadeca-l(18),2(6),4,14,16-pentaen-13-yl]carbamate (2.17 g, 88% yield) as a tan solid. MS(ESI) m/z: 436.3 [M+H]+. 1H NMR (400MHz, DMSO-d6) δ 9.32 (s, 1H), 8.71 (d, J=5.0 Hz, 1H), 7.96 (t, J=58 Hz, 1H), 7.43 (s, 1H), 7.32 (d, J=4.8 Hz, 1H), 7.22 (d, J=7.3 Hz, 1H), 4.66 (d, J=8.3 Hz, 1H), 2.62 (br. s., 1H), 1.88 (d, J=12.8 Hz, 1H), 1.77 – 1.59 (m, 2H), 1.42 – 1.28 (m, 9H), 1.15 (d, J=18.2 Hz, 2H), 0.83 (d, J=7.0 Hz, 3H).

I G. Preparation of (9R, 13S)-l 3-amino-3-(difiuoromethyl)-9-methyl-3,4,7, 15-tetraazatricyclo[]octadeca- 1(18),2(6),4, 14,16-pentaen-8-one

4 N HC1 in dioxane (3.88 mL, 15.5 mmol) was added to a solution of tert-butyl N-[(9R, 13S)-3-(difluoromethyl)-9-methyl-8-oxo-3,4,7, 15-tetraazatricyclo[] octadeca-l(18),2(6),4,14,16-pentaen-13-yl]carbamate (2.25 g, 5.2 mmol) in MeOH (10 mL). The reaction was allowed to stir at rt for 2 h. The reaction was cooled in an ice bath, and 7 N NH3 in MeOH (13.3 mL, 93.0 mmol) was added. After 5 min, the reaction was diluted with CH2C12 (80 mL) and the solid that formed was filtered. The filtrate was concentrated to yield (9i?,135)-13-amino-3-(difluoromethyl)-9-methyl-3,4,7,15-tetraazatricyclo[]octadeca-l(18),2(6),4,14,16-pentaen-8-one (1.3 g, 3.88 mmol, 75% yield). MS(ESI) m/z: 336.3 [M+H]+. 1H NMR (400MHz, DMSO-d6) δ 9.33 (s, 1H), 8.71 (d, J=5.0 Hz, 1H), 7.94 (t, J=58 Hz, 1H), 7.85 (s, 1H), 7.40 (s, 1H), 7.32 (d, J=5.0 Hz, 1H), 4.01 (dd, J=10.2, 5.1 Hz, 1H), 2.63 – 2.53 (m, 1H), 1.90 – 1.69 (m, 2H), 1.53 -1.36 (m, 2H), 1.16 – 1.00 (m, 1H), 0.85 (d, J=7.0 Hz, 3H).

1H. Preparation of (9i?,135)-13-{4-[5-chloro-2-(4-chloro-lH-l,2,3-triazol-l-yl)phenyl]-6-oxo- 1 ,6-dihydropyrimidin- 1 -yl} -3-(difluoromethyl)-9-methyl-3 ,4,7, 15-tetraazatricyclo []octadeca- 1 ( 18),2(6),4, 14,16-pentaen-8-one.

To a 100 mL flask containing a white suspension of 6-(5-chloro-2-(4-chloro-lH-l,2,3-triazol-l-yl)phenyl)pyrimidin-4-ol (0.83 g, 2.7 mmol), as prepared in Example 4 in ACN (36 mL) was added HATU (1.12 g, 3.0 mmol) and DBU (0.53 mL, 3.5 mmol). The resulting clear, yellow solution was stirred at rt. After 5 min, (9i?,135)-13-amino-3-(difluoromethyl)-9-methyl-3,4,7,15-tetraazatricyclo[]octadeca-l(18),2(6),4,14,16-pentaen-8-one (0.9 g, 2.68 mmol) was added and the resulting suspension was stirred at rt for 3 h. The reaction was then concentrated and purified by normal phase silica gel chromatography, eluting with a gradient of 0% to 100% EtOAc in hexanes to yield (9i?,135)-13-{4-[5-chloro-2-(4-chloro-lH-l,2,3-triazol-l-yl)phenyl]-6-oxo- 1 ,6-dihydropyrimidin- 1 -yl} -3-(difluoromethyl)-9-methyl-3 ,4,7, 15-tetraazatricyclo []octadeca-l(18),2(6),4,14,16-pentaen-8-one (0.87 g, 50% yield) as a white solid. MS(ESI) m/z: 626.2 [M+H]+. 1H NMR (500MHz, CD3OD) δ 8.91 – 8.83 (m, 1H), 8.78 – 8.71 (m, 1H), 8.33 (s, 1H), 7.88 (d, J=2.5 Hz, 1H), 7.74 (s, 2H), 7.69 – 7.67 (m, 1H), 7.65 (s, 1H), 7.63 (t, J=58 Hz, 1H), 7.52 – 7.50 (m, 1H), 6.36 (d, J=0.8 Hz, 1H),

6.06 – 5.95 (m, 1H), 2.76 – 2.65 (m, 1H), 2.36 – 2.21 (m, 1H), 2.08 – 1.93 (m, 2H), 1.63 -1.53 (m, 1H), 1.53 – 1.42 (m, 1H), 0.99 (d, J=6.9 Hz, 3H). Analytical HPLC (Method A): RT = 8.87 min, purity = 99.7%.

///////////MILVEXIAN, BMS 986177, JNJ 70033093,  JNJ 3093, WHO 11401, ミルベクシアン ,


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