Copper-Catalyzed Annulation of 2-Formylazoles with o-Aminoiodoarenes

In the presence of catalytic CuI and sparteine, 2-formyl-pyrroles can be annulated with o-aminoiodoarenes to give Substituted pyrrolo[1,2-a]quinoxalines and related heterocycles. The reaction also works for annulation of 2-formylindoles, 2-formylimidazole, 2-formylbenzimidazole, and a 3-formylpyrazole.