申请人:Singh Girij Pal
公开号:US20110257396A1
公开(公告)日:2011-10-20
An improved process for the manufacture of Lamivudine. The process involves:
(a) resolution of racemic lamivudine (intermediate of formula IX)
to cis (±) lamivudine of formula (XII) by forming a crystalline salt and separating the product from an organic solvent by fractional crystallization;
(b) resolution of cis (±) lamivudine to cis (−) isomer involving formation of S-Binol adduct of formula XIV.
一种改进的拉米夫定制造工艺。该工艺包括:(a) 通过形成结晶盐将拉米夫定的混合物(公式IX的中间体)分离为公式(XII)的顺式(±)拉米夫定,并通过分级结晶从有机溶剂中分离产物;(b) 通过形成公式XIV的S-Binol加合物将顺式(±)拉米夫定分离为顺式(−)异构体。