Process for preparing sildenafil

Organic compounds -- part of the class 532-570 series – Organic compounds – Nitrogen attached directly or indirectly to the purine ring...

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544383, C07D40312, C07D29526

Patent

active

060667354

ABSTRACT:
A process for the preparation of a compound of formula (I): ##STR1## which comprises cyclization of a compound of formula (II): ##STR2##

REFERENCES:
patent: 4871843 (1989-10-01), Roger et al.
Harriet W. Hamilton, et al. J. Med. Chem. 1987, 30, 91-96.

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