Process for the preparation of Derivatives of pyrazolo 4,3-d pyrimidin-7-one, including Sildenafil, Preparation method of the composite process of Brokers and intermediaries,The compounds prepared are useful in the treatment of erectile dysfunction.

摘要

Procedure for the production of a compound of General formula I: which comprises reacting a compound of formula II: the RX is a group or an aminopirazol,A compound of General formula (iii).