Method of Preparing Clopidogrel and Intermediates Used Therein
申请人:Kim Eun Sook
公开号:US20080214821A1
公开(公告)日:2008-09-04
Optically pure clopidogrel can be prepared in a high yield by optically resolving a racemic form of the compound of formula (II) using an optically active amine to form the optically active form of the compound of formula (III) or its acid-addition salt; and methylating the compound of formula (III) or its acid-addition salt.
Stereoselective Method for the Production of Clopidogrel
申请人:Stohandl Jiri
公开号:US20070219166A1
公开(公告)日:2007-09-20
The present invention relates to processes for preparing a compound of the general formula (Ia)
wherein X is a halogen atom, or a pharmaceutically acceptable salt thereof, wherein a compound of the formula (II)
wherein X is as defined above and Y and Z independently represent a leaving group each, is reacted with an optically active amino alcohol to form a first mixture of diastereomers.
METHOD PREPARATION CLOPIDOGREL AND INTERMEDIATES USED THEREIN
申请人:KIM Eun Sook
公开号:US20090318701A1
公开(公告)日:2009-12-24
Optically pure clopidogrel can be prepared in a high yield by optically resolving a racemic form of the compound of formula (II) using an optically active amine to form the optically active form of the compound of formula (III) or its acid-addition salt; and methylating the compound of formula (III) or its acid-addition salt.
Stereoselective Method for the Production of (R)-Dimepranol
申请人:Stohandl Jiri
公开号:US20090149677A1
公开(公告)日:2009-06-11
The present invention relates to processes for preparing a compound of the general formula (Ia)
wherein X is a halogen atom, or a pharmaceutically acceptable salt thereof, wherein a compound of the formula (II)
wherein X is as defined above and Y and Z independently represent a leaving group each, is reacted with an optically active amino alcohol to form a first mixture of diastereomers.
Process for the Preparation of S-(+)-Clopidogrel by Optical Resolution
申请人:Kim Jae-Sun
公开号:US20090275755A1
公开(公告)日:2009-11-05
The present invention relates to a process for the preparation of S-(+)-clopidogrel by an optical resolution and, more particularly, to a process for the preparation of S-(+)-clopidogrel represented by the following formula 1 with high optical purity by converting a clopidogrel racemic carboxylic acid into a diastereomeric salt using a (+)-cinchonine for optical resolution, extracting an S-(+)-clopidogrel carboxylic acid from the diastereomeric salt using a suitable solvent under an acidic condition and then reacting the S-(+)-clopidogrel carboxylic acid with methanol.