PROCESS FOR PREPARATION OF CLOPIODOGREL BISULFATE FORM-1
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United States of America Patent
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Issued Date -
Sep 13, 2012
app pub date -
Mar 22, 2010
filing date -
Nov 9, 2009
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Abstract
An improved process for preparing crystalline form-1 of (S)-methyl 2-(2-chlorophenyl)-2-{6,7-dihydrothieno[3,2-c]pyridine-5(4H)-yl}acetate bisulfate (clopidogrel bisulfate) of formula I is provided The preparation comprises the straight conversion of an uncyclized material of (S)-methyl 2-[2-(thiophen-2-yl)ethylamino]-2-(2-chlorophenyl) acetate hydrochloride into clopidogrel bisulfate crystalline form-1 without any degradation of clopidogrel base
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