Disclosed are compounds of formula (I), wherein R.sup.1, R.sup.3 and R.sup.8 are independently alkyl, aryl or aralkyl, and R.sup.2 is selected from the group consisting of S and O, R.sup.6 is selected from the group consisting of S and O, provided that R.sup.2 and R.sup.6 are not both O. The compounds are effective PDE IV inhibitors and possess improved PDE IV inhibition and improved selectivity with regard to PDE III inhibition. Methods of treatment using the compounds are also disclosed.
本发明揭示了式(I)的化合物,其中R.sup.1、R.sup.3和R.sup.8独立地为烷基、芳基或芳基烷基,而R.sup.2选自由S和O组成的群,R.sup.6选自由S和O组成的群,前提是R.sup.2和R.sup.6不同时为O。这些化合物是有效的PDE IV
抑制剂,具有改善的PDE IV抑制作用和改善的PDE III抑制作用选择性。本发明还揭示了使用这些化合物的治疗方法。