Stereoselective process for the preparation of 2-amino-ethanol derivatives having a central analgesic activity and intermediates thereof.

摘要

A stereoselective process for the preparation of the compounds of formula <CHEM> wherein R, R1, R2, 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.