专利号:WO-2004074215-A1 优先权日:2003-02-03 标 题 :Process for preparation of clopidogrel, its salts and pharmaceutical compositions 发明人:NADKARNI SUNIL SADANAND; PATEL HASMUKH MATHURBHAI 权利人:NADKARNI SUNIL SADANAND; PATEL HASMUKH MATHURBHAI 摘要:The invention discloses an improved process for racemization of methyl (R)Â(-) alpha-(2-chlorophenyl)-6,7-dihydro-thieno[3,2-c]pyridine-5(4H)-acetate , a stereoisomer formed in the synthesis of clopidogrel i.e. methyl (S)-(+)-alpha (2-chlorophenyl)-6,7-dihydro-thieno[3,2-c]pyridine-5(4H)-acetate or its salts. The invention is also for an improved process for production of clopidogrel or its pharmaceutically acceptable salts. The invention further discloses novel clopidogrel salts and pharmaceutical compositions comprising them.