Synthesis of 1-aryl-3H-[1,2,5]triazepino[5,4-a]benzimidazol-4(5H)-ones and quantum chemical investigation of the rotamers of the Boc-protected hydrazide key intermediate
1. Directorate of Drug Substance Development, Egis Pharmaceuticals Plc., 1475 Budapest, POB 100, Hungary;2. Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1519 Budapest, POB 286, Hungary