申请人:Zambon Group S.p.A
公开号:US05142066A1
公开(公告)日:1992-08-25
A stereoselective process for the preparation of the compounds of formula ##STR1## wherein R, R.sub.1, R.sub.2, a and b have the meanings reported in the specification, is described. The compounds of formula I have a remarkable central analgesic activity and they are useful in the pharmaceutical field.
本发明提供了一种立体选择性的方法,用于制备公式##STR1##中R、R.sub.1、R.sub.2、a和b的化合物。其中R、R.sub.1、R.sub.2、a和b的含义在说明书中有所描述。公式I的化合物具有显著的中枢镇痛活性,并且在制药领域中有用。