The present invention provides the compounds of the formula (II):
and pharmaceutically acceptable salts and cleavable esters thereof wherein RCONH is an organic acylamino group and E is a carboxy group or pharmaceutically acceptable salt or ester thereof or is a cyano group. Their preparation is described as is their use in compositions containing them. Compounds wherein RCONH is replaced by an azido group are described as useful intermediates.
本发明提供了式(II)化合物:
及其药学上可接受的盐和可裂解酯 其中 RCONH 是有机酰
氨基,E 是羧基或其药学上可接受的盐或酯或
氰基。本文介绍了它们的制备方法以及在含有它们的组合物中的用途。RCONH 被
叠氮基团取代的化合物被描述为有用的中间体。