198904-87-9Relevant articles and documents
Process research and development for an efficient synthesis of the HIV protease inhibitor BMS-232632
Xu, Zhongmin,Singh, Janak,Schwinden, Mark D.,Zheng, Bin,Kissick, Thomas P.,Patel, Bharat,Humora, Michael J.,Quiroz, Fernando,Dong, Lin,Hsieh, Dau-Ming,Heikes, James E.,Pudipeddi, Madhusudhan,Lindrud, Mark D.,Srivastava, Sushil K.,Kronenthal, David R.,Mueller, Richard H.
, p. 323 - 328 (2002)
Development of an efficient and scalable process for the human immunodeficiency virus (HIV) protease inhibitor BMS-232632 1-[4-(pyridin-2-yl)phenyl]-5(S)-2,5-bis{[N-(methoxycarbonyl)L-tert- leucinyl]-amino}-4(S)-hydroxy-6-phenyl-2-azahexane, is described. The key step in the synthesis of the intermediate N-1-(tert-butyloxycarbonyl)-N-2-[4-(pyridin-2-yl)benzylidene]hydrazone (11) was the Pd-mediated coupling of boronic acid 9 with 2-bromopyridine. An efficient procedure was developed for the chemoselective reduction of hydrazone 11 to hydrazine carbamate 4. The key intermediate N-(tert-butyloxycarbonyl)-2(S)-amino-1-phenyl-3(R)-3,4-epoxy-butane (6) was prepared stereoselectively from chiral diol 10. The subsequent union of 4 and 6 followed by coupling with N-methoxycarbonyl-L-tert-leucine provided the free base BMS-232632 in high yield. Evaluation of a variety of salts and identification of bisulfate salt 19 with enhanced bioavallability are also described.
PROCESS FOR THE PREPARATION OF ATAZANAVIR BISULFATE
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Paragraph 0085, (2015/07/15)
The present invention relates to an improved process for the preparation of Atazanavir bisulfate Form A. The present invention also relates to a pharmaceutical composition using the Atazanavir bisulfate Form A of the invention.
PROCESS FOR THE PREPARATION OF ATAZANAVIR SULFATE SUBSTANTIALLY FREE OF DIASTEREOMERS
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Page/Page column 16, (2011/10/03)
The present invention provides atazanavir sulfate substantially free of diastereomeric impurities. The present invention also provides atazanavir sulfate having D-tertiary leucine analogues less than 0.1%. The present invention further relates to an improved process for preparing atazanavir sulfate, substantially free of its diastereoisomeric impurities, which comprises of reacting diamino compound (IV) with N-methoxycarbonyl-(L)-tertiary-leucine (V) having D-isomer less than 0.1 % to obtain atazanavir base; conversion of atazanavir base to atazanavir sulfate by reacting with sulfuric acid and crystallization of atazanavir sulfate from suitable organic solvent(s).