Compounds of formulae (IA) and (IB) or pharmaceutically or veterinarily acceptable salts thereof, or pharmaceutically or veterinarily acceptable solvates of either entity, wherein R
1
is C
1
to C
3
alkyl substituted with C
3
to C
6
cycloalkyl, CONR
5
R
6
or a N-linked heterocyclic group; (CH
2
)
n
Het or (CH
2
)
n
Ar, R
2
is C
1
to C
6
alkyl; R
3
is C
1
to C
6
alkyl optionally substituted with C
1
to C
4
alkoxy; R
4
is SO
2
NR
7
R
8
; R
5
and R
6
are each independently selected from H and C
1
to C
4
alkyl optionally substituted with C
1
to C
4
alkoxy, or, together with the nitrogen atom to which they are attached, form a 5- or 6-membered heterocyclic group; R
7
and R
8
, together with the nitrogen atom to which they are attached, form a 4-R
10
-piperazinyl group; R
10
is H or C
1
to C
4
alkyl optionally substituted with OH, C
1
to C
4
alkoxy or CONH
2
; Het is an optionally substituted C-linked 5- or 6-membered heterocyclic group; Ar is optionally substituted phenyl; and n is 0 or 1; are potent and selective cGMP PDE5 inhibitors useful in the treatment of, inter alia, male erectile dysfunction and female sexual dysfunction
式(IA)和(IB)的化合物,或其药学或兽医学上可接受的盐,或者是其中任何一种实体的药学或兽医学上可接受的溶剂化物,其中R1是C1到C3烷基,被C3到C6环烷基,CONR5R6或N-连接的杂环基所取代;(
CH2)nHet或( )nAr,R2是C1到C6烷基;R3是C1到C6烷基,可选择地被C1到C4烷氧基取代;R4是SO2NR7R8;R5和R6各自独立地选择自H和C1到C4烷基,可选择地被C1到C4烷氧基取代,或者与它们所连接的氮原子一起形成一个5-或6-成员杂环基;R7和R8与它们所连接的氮原子一起形成一个4-R10-
哌嗪基团;R10是H或者C1到C4烷基,可选择地被OH,C1到C4烷氧基或CONH2取代;Het是可选择地被取代的C-连接的5-或6-成员杂环基;Ar是可选择地被取代的苯基;n为0或1;这些化合物是有效的和选择性的cGMP PDE5
抑制剂,用于治疗男性勃起功能障碍和女性性功能障碍等疾病。