PYRAZOLONE DERIVATIVE AND PDE INHIBITOR CONTAINING THE SAME AS ACTIVE INGREDIENT

摘要

It is to provide a novel pyrazolone derivative represented by the following general formula (1), which is useful as a pharmaceutical and has a phosphodiesterase inhibitory action:
wherein R 1 ,R 2 : C 1-6 alkyl; R 3 ,R 4 : H, X, C 1-6 alkoxy; Z:O, S; A:AA, BB, wherein AA represents
wherein BB represents
wherein R 5 : H, C 1-6 alkyl ; R 6 ,R 7 : C 1-6 alkyl.