作者:Guo‐Hua Chu、Minghua Gu、Baudouin Gerard、Roland E. Dolle
DOI:10.1081/scc-200043270
日期:2004.1
Abstract α‐Aminonitriles are prepared upon reaction of aryl carboxaldehydes with LiHMDS and acetone cyanohydrin. This newmethod provides a general route to the synthesis of various substituted α‐amino‐arylacetonitriles in high yield and purity, and avoids the use of the highly toxic cyanide salts.
RACEMIZATION AND ENANTIOMER SEPARATION OF CLOPIDOGREL
申请人:——
公开号:US20040024011A1
公开(公告)日:2004-02-05
Processes for separation of enantiomers of clopidogrel, and converting one enantiomer of clopidogrel to another enantiomer of clopidogrel are provided. The enantiomers are separated by crystallizing the (S) enantiomer as camphor sulfonate salt from a hydrocarbon, or a mixture of a hydrocarbon and a co-solvent, preferably DMF:toluene. The (R) enantiomer is then racemized and recycled by reaction with a catalytic amount of a base, preferably with t-butoxide.
Racemization and enantiomer separation of clopidogrel
申请人:——
公开号:US20040024012A1
公开(公告)日:2004-02-05
Processes for separation of enantiomers of clopidogrel, and converting one enantiomer of clopidogrel to another enantiomer of clopidogrel are provided. The enantiomers are separated by crystallizing the (S) enantiomer as camphor sulfonate salt from a hydrocarbon, or a mixture of a hydrocarbon and a co-solvent, preferably DMF:toluene. The (R) enantiomer is then racemized and recycled by reaction with a catalytic amount of a base, preferably with t-butoxide.
[EN] RACEMIZATION AND ENANTIOMER SEPARATION OF CLOPIDOGREL<br/>[FR] RACEMISATION ET SEPARATION D'ENATIOMERES DE CLOPIDOGREL
申请人:TEVA PHARMA
公开号:WO2004013147A1
公开(公告)日:2004-02-12
Processes for separation of enantiomers of clopidogrel, and converting one enantiomer of clopidogrel to another anantiomer of clopidogrel are provided. The enantiomers are separated by crystallizing the (S) enantiomer as camphor sulfonate salt from a hydrocarbon, or a mixture of a hydrocarbon and a co-solvent, preferably DMF:toluene. The (R) enantiomer is then racemized and recycled by reaction with a catalytic amount of a base, preferably with t-butoxide.
Racemization and Enantiomer Separation of Clopidogrel
申请人:TEVA PHARMACEUTICAL INDUSTRIES LTD.
公开号:EP2168969A2
公开(公告)日:2010-03-31
Processes for separation of enantiomers of clopidogrel, and converting one enantiomer of clopidogrel to another enantiomer of clopidogrel are provided. The enantiomers are separated by crystallizing the (S) enantiomer as camphor sulfonate salt from a hydrocarbon, or a mixture of a hydrocarbon and a co-solvent, preferably DMF:toluene. The (R) enantiomer is then racemized and recycled by reaction with a catalytic amount of a base, preferably with t-butoxide.