Synthesis of diimidazo[1,2-a:2′,1′-c]pyrazines and diimidazo[1,2-a:2′,1′-c] [1,4]diazepines

Two new heterocyclic compounds, diimidazo1,2-a:2′,1-c]pyrazine and 5H-diimidazo1,2-a: 2,1′-c]1,4]diazepine have been synthesized by various routes from 2,2′-biimidazole (1) (2) together with some hydro, hydroxy and alkyl derivatives.