发明申请
US20080207726A1 Process for the purification of carvedilol or its salts thereof 审中-公开
卡维地洛或其盐的净化方法

Process for the purification of carvedilol or its salts thereof
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.
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