5-(2-Substituted-5-heterocyclylsulphonylpyrid-3-yl)-dihydropyrazoloÄ4,3-DÜpyrimidin-7-ones as phosphodiesterase inhibitors.

摘要

There is provided a compound of formula I:whereinX represents O or NR5 R4 represents H, halo, cyano, nitro, halo(loweralkyl), OR6, OC(O)R7, C(O)R8, C(O)OR9, C(O)NR10R11, NR12R13, NR16Y(O)R17, N[Y(O)R17]2, SOR18, SO2R19, C(O)AZ, lower alkyl, lower alkenyl, lower alkynyl, Het, alkylHet, aryl, alkylaryl (which latter seven groups are all optionally substituted with one or more substituents selected from halo, cyano, nitro, lower alkyl, halo(loweralkyl), OR6, OC(O)R7, C(O)R8, C(O)OR9, C(O)NR10R11, NR12R13 and SO2NR14R15)which are useful in the curative and prophylactic treatment of a medical condition for which inhibition of a cyclic guanosine 3',5'-monophosphate phosphodiesterase (e.g., cGMP PDE5) is desired.