NEW METHOD OF CHIRAL SYNTHESIS OF N-ACYL- (3-SUBSTITUTED) - (8-SUBSTITUTED) -5,6-DIHYDRO 1,2,4 TRIAZOLO 4,3-a Pyrazines

摘要

This invention relates to a new method for chiral synthesis of N-acyl- (3-substituted) - (8-substituted) -5,6-dihydro [1,2,4] triazolo [4,3-a] pyrazines of the formula I, without using stages of installation and removal of protective groups.