Pyrazolopyrimidinone derivatives, process for their preparation and their use

摘要

This invention relates to a series of pyrazolopyrimidinone derivatives, having an excellent inhibiting activity against cyclic guanosine 3',5'- monophosphate specific phosphodiesterase (cGMP specific PDE; PDE V), process for their preparation, intermediates in their preparation, their uses as therapeutic agents, and pharmaceutical compositions containing them.