Synthesis of New Chiral 4,5,6,7-Tetrahydro[1,2,3]triazolo[1,5-a]pyrazines from α-Amino Acid Derivatives under Mild Conditions - Mohapatra, Debendra K; Maity, Pradip K; Gonnade, Rajesh G; Chorghade, Mukund S; Gurjar, Mukund K (Synlett, 2007)