Compounds of formula (1) ##STR1## are described wherein Y represents a halogen atom or a group --OR.sup.1, where R.sup.1 is an optionally substituted alkyl group; R.sup.2 represents an optionally substituted cycloalkyl or cycloalkenyl group; R.sup.3 is a monocyclic or bicyclic aryl group optionally containing one or more heteroatoms selected from oxygen or sulphur atoms or a group --N(R.sup.4)-- where R.sup.4 is a hydrogen atom or an alkyl group; X is --O--, --S--, or --N(R.sup.5)--, where R.sup.5 is a hydrogen or an alkyl group; with the proviso that when X is --O-- then R.sup.3 is not a 3-cyanamino-6-pyridazinyl or a 3-chloro-6-pyridazinyl group; and the salts, solvates, hydrates and N-oxides thereof. The compounds are selective and potent inhibitors of phosphodiesterase IV and are useful for the prophylaxis and treatment of inflammatory diseases and the alleviation of conditions associated with central nervous malfunction.
                            描述了式(1)的化合物##STR1##其中,Y代表卤原子或基团--OR.sup.1,其中R.sup.1是可选取代的烷基基团;R.sup.2代表可选取代的环烷基或环烯基基团;R.sup.3是单环或双环芳基基团,可选包含一个或多个从氧或
硫原子选择的杂原子或基团--N(R.sup.4)--,其中R.sup.4是氢原子或烷基基团;X是--O--,--S--或--N(R.sup.5)--,其中R.sup.5是氢或烷基基团;但是当X为--O--时,R.sup.3不是3-
氰基
氨基-6-
吡啶嗪基或3-
氯-6-
吡啶嗪基。该化合物是选择性和强效的
磷酸二酯酶IV
抑制剂,可用于预防和治疗炎症性疾病以及缓解与中枢神经功能障碍相关的症状。其盐,溶剂合物,
水合物和N-氧化物也在描述范围内。