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.
Process for Preparing Gemcitabine and Associated Intermediates
申请人:Naddaka Vladimir
公开号:US20070191598A1
公开(公告)日:2007-08-16
The present invention provides processes for preparing novel chemical substances that are useful as intermediates in the preparation of gemcitabine and processes for preparing gemcitabine therewith. Exemplary intermediates include mixtures of D-erythro and D-threo (3R- and 3S-) isomers of 3-(hydroxy)-2,2-difluoro-3-(2,2-dimethyldioxolan-4-yl)propionic acid salts. Also provided is a novel process for selectively isolating the D-erythro and D-threo isomers of the said salts in purities of at least about 95%, and processes of using them for preparing nucleoside analogs such as, e.g., gemcitabine and intermediates and analogs thereof.