A process is provided for the preparation of a compound of formulae (IA) (sidenafil) and (IB)
1
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 CH
2
CH
3
and R in the case of formation of compound (IB) is CH
2
CH
2
CH
3
, where X is a leaving group:
2
提供一种制备式(IA)(
西地那非)和(IB)的化合物的过程,包括在−OR存在下分别反应式(IIA)和(IIB)的化合物,其中在形成化合物(IA)的情况下,R为CH2CH3,在形成化合物(IB)的情况下,R为CH2CH2CH3,其中X是一个离去基团。