A compound of formula (I) and salts and solvates thereof, in which: R.sup.0 represents hydrogen, halogen, or C.sub.1-6 alkyl; R.sup.1 represents hydrogen, C.sub.1-6 alkyl, C.sub.2-6 alkenyl, C.sub.2-6 alkynyl, haloC.sub.1-6 alkyl, C.sub.3-8 cycloalkyl, C.sub.3-8 cycloalkylC.sub.1-3 alkyl, arylC.sub.1-3 alkyl, or heteroarylC.sub.1-3 alkyl; R.sup.2 represents an optionally substituted monocyclic aromatic ring selected from benzene, thiophene, furan, and pyridine, or an optionally substituted bicyclic ring (a) attached to the rest of the molecule via one of the benzene ring carbon atoms, and wherein the fused ring (A) is a 5- or 6-membered ring which may be saturated or partially or fully unsaturated, and comprises carbon atoms and optionally one or two heteroatoms selected from oxygen, sulphur, and nitrogen; and R.sup.3 represents hydrogen or C.sub.1-3 alkyl, or R.sup.1 and R.sup.3 together represent a 3- or 4-membered alkyl or alkenyl chain. A compound of formula (I) is a potent and selective inhibitor of cyclic guanosine 3',5'-monophosphate specific phosphodiesterase (cGMP specific PDE) having a utility in a variety of therapeutic areas where such inhibition is beneficial, including the treatment of cardiovascular disorders and erectile dysfunction.
化合物式(I)及其盐和溶剂化物,其中:R.sup.0代表氢,卤素或C.sub.1-6烷基; R.sup.1代表氢,C.sub.1-6烷基,C.sub.2-6烯基,C.sub.2-6炔基,卤代C.sub.1-6烷基,C.sub.3-8环烷基,C.sub.3-8环烷基C.sub.1-3烷基,芳基C.sub.1-3烷基或杂环芳基C.sub.1-3烷基; R.sup.2代表一种可选择的取代的单环芳香环,选自苯,
噻吩,
呋喃和
吡啶,或者是一个可选择的取代的双环环(a),通过苯环碳原子之一连接到分子的其余部分,其中融合的环(A)是一个5-或6-成员环,可以饱和或部分或完全不饱和,并且包括碳原子和可选择的一个或两个异原子,选自氧,
硫和氮; R.sup.3代表氢或C.sub.1-3烷基,或者R.sup.1和R.sup.3一起代表一个3-或4-成员烷基或烯基链。化合物式(I)是环
鸟苷3',5'-单
磷酸特异性
磷酸二酯酶(cGMP特异性PDE)的有效和选择性
抑制剂,在许多治疗领域中具有有益的抑制作用,包括心血管疾病和勃起功能障碍的治疗。