Process for preparation of pyrazolo[4,3-d]pyrimidin-7-ones...

Details Process for preparation of pyrazolo[4,3-d]pyrimidin-7-ones... Process for preparation of pyrazolo[4,3-d]pyrimidin-7-ones...

C - Chemistry, Metallurgy

07

D

C07D 487/04 (2006.01) C07D 231/40 (2006.01) C07D 295/26 (2006.01) C07D 401/06 (2006.01)

Patent

CA 2285733

A process is provided for the preparation of a compound of formulae (IA) (sidenafil/ ViagraTM TM) and (IB) (see formula IA, 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: (see formula IIA, IIB)

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