The present invention provides an improved process for the preparation of pure Clopidogrel bisulfate Form-I of formula (I), which comprises: reacting S(+)-methyl-2- [2-(thiophen-2-yl)ethylamino]-2-(2-chlorophenyl) acetate hydrochloride (Formula II) with Formaldehyde and R-(-) Camphor sulphonic acid to yield S (+)-Clopidogrel camphor sulfonate salt (Formula III), which is on further treatment with C1-5 carboxylic acid followed by sulphuric acid to get Clopidogrel Form-I.
该发明提供了一种改进的制备纯
氯吡格雷双
硫酸盐I型的方法,包括:将S(+)-甲基-2-[2-(
噻吩-2-基)乙基
氨基]-2-(2-
氯苯基)
乙酸盐酸盐(式II)与
甲醛和R-(-)
樟脑磺酸反应,得到S(+)-
氯吡格雷樟脑磺酸盐(式III),进一步经过C1-5
羧酸和
硫酸处理得到
氯吡格雷I型。