A process is provided for the preparation of a compound of formulae (IA) (sidenafil/ ViagraTm™) and (IB)
comprising reacting a compound of formula (IIA) and (IIB) respectively in the presence of -OR, wherein R in the case of formation of compound (IA) is CH2CH3 and R in the case of formation of compound (IB) is CH2CH2CH3, where X is a leaving group:
提供了一种制备式(IA)化合物(
西地那非/伟哥™)和(IB)化合物的工艺
包括分别使式(IIA)和(IIB)化合物在-OR存在下反应,其中形成化合物(IA)时R为CH2CH3,形成化合物(IB)时R为CH2CH2CH3,其中X为离去基团: