KI/TBHP-promoted [3 + 2] cycloaddition of pyrrolo[1,2-a]quinoxalines and N-arylsulfonylhydrazones.

An efficient KI/TBHP-promoted [3 + 2] cycloaddition of pyrrolo[1,2-a]quinoxalines and N-tosylhydrazones is described. A series of diverse fused [1,2,4]triazolo[3,4-c]quinoxalines was obtained in moderate to good yields with wide functional group tolerance. Importantly, this reaction can be performed on a gram scale, even in a one-pot fashion. In addition, further transformations of the products were also investigated.