A process for preparing pyrazolopyrimidinone derivatives for...

Details A process for preparing pyrazolopyrimidinone derivatives for... A process for preparing pyrazolopyrimidinone derivatives for...

C - Chemistry, Metallurgy

07

D

C07D 487/04 (2006.01)

Patent

CA 2413761

The present invention relates to the method for preparing pyrazolopyrimidinone derivatives and their pharmaceutically acceptable salts having efficacy on the treatment of impotence, one of male sexual dysfunctions. The method according to the present invention comprises the steps of chlorosufonation the pyrazolamide, followed by amination with amine and intramolecular cyclization. The method provides the pyrazolopyrimidinone derivatives and their pharmaceutically acceptable salts with high yield and in an economic manner.

L'invention concerne un procédé de préparation de dérivés de pyrazolopyrimidinone et de leurs sels acceptables sur le plan pharmaceutique, efficaces pour traiter l'impuissance, qui est une dysfonction sexuelle chez l'homme. Selon l'invention, le procédé consiste en les étapes de chlorosulfonation du pyrazoloamide, suivie de l'amination à l'amine et de la cyclisation intramoléculaire. Ce procédé permet de produire des dérivés de pyrazolopyrimidinone et leurs sels acceptables sur le plan pharmaceutique en grande quantité et de façon économique.

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