A PROCESS FOR PREPARATION OF METHYL-(+)-(S)-ALPHA-(2-CHLOROPHENYL)-6,7-DIHYDROTHIENO[3,2-C]PYRIDINE-5(4H)-ACETIC ACID METHYL ESTER OR SALTS THEREOF HAVING HIGHER CHIRAL PURITY AND PRODUCTS THEREOF

摘要

A process for preparation of Methyl-(+)-(S)-alpha-(2-chlorophenyl) -6,7-dihydrothieno[3,2-c]pyridine-5(4H)-acetic acid methyl ester or salts thereof [clopidogrel or salts thereof of Formula (I)] having higher chiral purity and products thereof is provided. A process for purification of the compound prepared is also provided to enhance its efficacy by enhancing its optical rotation and chiral purity. In Formula (I), R is selected from a group comprising alkyl, alkoxy, hydroxy, amine etc., and R₁ is selected from the group comprising C_1-4 alkyl, C_1-4 alkoxy, hydroxy, nitro & halogen. The particular salt of interest of the present invention is the hydrogen sulfate of compound of the Formula (I), wherein R and R₁ are -OCH₃ and chloro-group at position 2 respectively.