Optically pure voriconazole can be prepared in a high yield by a) subjecting 1-(2,4-difluorophenyl)-2(1H-1,2,4-triazol-1-yl)ethanone to Reformatsky-type coupling reaction with a substituted thiopyrimidine derivative to obtain a desired (2R,3S)/(2S,3R)-enantiomeric pair; b) removing the thiol derivative from the enantiomer to obtain racemic voriconazole; and c) isolating the racemic voriconazole by way of optical resolution using an optically active acid.
通过以下步骤可以高产地制备光学纯的
伏立康唑:a)将1-(2,4-二
氟苯基)-2(
1H-1,2,4-三唑-1-基)乙酮与取代
硫嘧啶衍
生物进行Reformatsky型偶合反应,得到所需的(2R,3S)/(2S,3R)-对映体;b)从对映体中去除
硫醇衍
生物,得到外消旋的
伏立康唑;c)使用光学活性酸进行光学分辨,得到光学纯的
伏立康唑。