Process for preparing sildenafil

C - Chemistry – Metallurgy – 07 – D

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C07D 487/04 (2006.01) C07D 231/14 (2006.01) C07D 231/40 (2006.01) C07D 295/26 (2006.01)

Patent

CA 2207694

A process for the preparation of a compound of formula (I): (see above formula) which comprises cyclisation of a compound of formula (II): (see above formula)

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