Compounds of formula (Ia) wherein Xa is CH or nitrogen, Ya is oxygen or sulfur, R?1a and R2a¿ are specific substituents, R?3a, R4a and R5a¿ are the same or different, hydrogen, halogen, cyano, lower alkoxy or lower-alkoxy-substituted aralkyl; or two of R?3a, R4a and R5a¿ may combine together to form lower alkylenedioxy, and m is 1 or 2, are useful as cGMP-PDE inhibitors.
式(Ia)中的化合物,其中Xa为CH或
氮,Ya为
氧或
硫,R1a和R2a是特定的取代基,R3a,R4a和R5a为相同或不同的
氢,卤素,
氰基,低烷
氧基或低烷
氧基取代的芳基
甲基; 或者R3a,R4a和R5a中的两个可以结合形成低烷基二
氧,m为1或2,可用作cGMP-PDE
抑制剂。