申请人:Parthasaradhi Reddy Bandi
公开号:US20090054682A1
公开(公告)日:2009-02-26
The present invention provides an improved and commercially viable process for the preparation of oseltamivir phosphate. Thus, for example, ethyl (3R,4R,5S)-4-amino-5-azido-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylate is acetylated with acetic anhydride in methylene chloride in the presence of triethyl amine in the absence of water to give ethyl (3R,4R,5S)-4-(acetylamino)-5-azido-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylate.
本发明提供了一种改进且具有商业可行性的奥司他韦磷酸盐制备过程。因此,例如,乙酸(3R,4R,5S)-4-氨基-5-叠氮基-3-(1-乙基丙氧基)-1-环己烯-1-羧酸乙酯在三乙胺存在下在无水的氯甲烷中与乙酰酐发生乙酰化反应,得到乙酸(3R,4R,5S)-4-(乙酰氨基)-5-叠氮基-3-(1-乙基丙氧基)-1-环己烯-1-羧酸乙酯。