[EN] A PROCESS FOR PREPARATION OF CRYSTALLINE FORM I OF CLOPIDOGREL BISULFATE<br/>[FR] PROCÉDÉ DE PRÉPARATION DE LA FORME CRISTALLINE I DU BISULFATE DE CLOPIDOGREL
申请人:RPG LIFE SCIENCES LTD
公开号:WO2011125069A1
公开(公告)日:2011-10-13
The present invention relates to process for preparation of crystalline Form I of clopidogrel bisulfate comprising steps of preparing clear solution of clopidogrel free base in ethyl acetate, which is cooled to a temperature varying from about -7 to about - 10°C and reacted with concentrated sulphuric acid while maintaining said temperature, thereafter slowly warmed to room temperature, and then heated to reflux, which on cooling to room temperature, filtration, washing and vacuum drying results in crystalline Form 1 of clopidogrel bisulfate.
Process for making crystalline form I of clopidogrel hydrogen sulphate
申请人:Sajja Eswaraiah
公开号:US20060205766A1
公开(公告)日:2006-09-14
A process for preparation of crystalline Form I of clopidogrel hydrogen sulphate, that include separating the crystalline Form I of clopidogrel hydrogen sulphate from a solution of clopidogrel freebase in a solvent, which is 2-propanol or 2-butanol is provided.
[EN] PROCESSES FOR THE PREPARATION OF CLOPIDOGREL HYDROGEN SULFATE POLYMORPHIC FORM I<br/>[FR] PROCEDES POUR LA PREPARATION DE CLOPIDOGREL HYDROGENOSULFATE DE FORME POLYMORPHE I
申请人:KRKA TOVARNA ZDRAVIL D D NOVO
公开号:WO2005100364A1
公开(公告)日:2005-10-27
Processes for the preparation of clopidogrel hydrogen sulfate of polymorphic form I are described which include use of specific solvents and process measures to avoid formation of undesired by-products.
[EN] A PROCESS FOR THE PREPARATION OF S-CLOPIDOGREL<br/>[FR] PROCÉDÉ DE PRÉPARATION DE S-CLOPIDOGREL
申请人:SANDOZ AG
公开号:WO2010046476A1
公开(公告)日:2010-04-29
A process for the preparation of (S) - Clopidogrel free base or a pharmaceutically acceptable salt thereof by the racemization of the undesired (R) - Clopidogrel in the presence of a suitable base followed by resolution with camphor sulfonate salt and further treatment with an inorganic acid to yield the title compound.