Novel and Highly Stereoselective Process for Preparing Gemcitabine and Intermediates Thereof
申请人:Xu Yongxiang
公开号:US20100179314A1
公开(公告)日:2010-07-15
The present invention provides a novel and highly stereoselective process for preparing gemcitabine, which is suitable for industrial production, wherein, it includes the following reactions. Additionally, the invention discloses the key intermediates. The definition for the groups of G1, G2, G3, G4, and G5 are described in the specification.
[EN] AN IMPROVED PROCESS FOR THE MANUFACTURE OF HIGH PURE GEMCITABINE HYDROCHLORIDE<br/>[FR] METHODE AMELIOREE DE PRODUCTION DE CHLORHYDRATE DE GEMCITABINE DE GRANDE PURETE
申请人:POLTURI RAMESH BABU
公开号:WO2005095430A1
公开(公告)日:2005-10-13
A process for the preparation of Gemcitabine hydrochloride of formula (I) of extra high purity by the reaction of (R) -2,3-0-isopropylidene glyceraldehyde of formula (II) with ethyl bromo difluoroacetate of formula (III) followed by hydrolytic cyclization of the product of formula (IV) converting the product into a dibenzoyl derivative of formula (V) of high purity reducing the product of formula (V) and converting the resultant lactol into a mesylate of formula (VI) followed by coupling the mesylate of formula (VI) with bis-silyl acetyl cytosine of formula (X) and subsequently deblocking and purifying.