A rapid entry to amino acids derived diverse 3,4-dihydropyrazines and ihydro[1,2,3]triazolo[1,5-a]pyrazines through 1,3-dipolar cycloaddition

Abstract

An efficient, general and practical synthesis of diverse 3,4-dihydropyrazines, 6,7-dihydro-[1,2,3]triazolopyrazines and 7,8-dihydro-[1,2,3]triazolodiazepines through intramolecular 1,3-dipolar cycloaddition from amino acids derived common intermediate with high yields is described. Moreover, one-pot access to optically active 3-aryl substituted 6,7-dihydro-[1,2,3]triazolo[1,5-a]pyrazines under palladium–copper co-catalytic system has also been achieved in this work. The easy substrate availability and operational simplicity make the process suitable for further exploration.