发明申请
- 专利标题: Process for the purification of carvedilol or its salts thereof
- 专利标题(中): 卡维地洛或其盐的净化方法
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申请号: US11823910申请日: 2007-06-28
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公开(公告)号: US20080207726A1公开(公告)日: 2008-08-28
- 发明人: Santiago Ini , Ron Bar-Shavit , Marina Isaev
- 申请人: Santiago Ini , Ron Bar-Shavit , Marina Isaev
- 主分类号: A61K31/403
- IPC分类号: A61K31/403 ; A61P9/00 ; C07D209/84
摘要:
The present invention provides processes for reducing bis impurities ((1,1′-[2-(2-methoxyphenoxy)ethyl]iminobis-[3-(9H-carbazol-4-yloxy)]-propan-2-ol)), in particular Bis 1 and Bis 2, in carvedilol preparations. The process may comprise (a) combining carvedilol base with phosphoric acid in ethanol to obtain a reaction mixture; and (b) precipitating carvedilol phosphate from the reaction mixture, where the carvedilol phosphate comprises low levels of Bis 1 and Bis 2.