Synthesis of unsubstituted 4H,8H-bisfurazano[3,4-b:3′,4′-e]pyrazine

Abstract

The title compound 2a was synthesized by a four-step sequence starting from 4,5-dichlorofurazano[3,4-b]pyrazine 3; the key step being a one-pot transformation of tetrazolo sulfilimine 6 to 2a via an oxidation/tetrazole ring cleavage/nitrogen loss/ring-closure/ proton trapping procedure.