An efficient copper-catalyzed tandem oxidation/α-formylation reaction of 2,3-dihydro-1H-pyrroles in oxygen atmosphere has been developed.The new reaction is conducted in dimethyl sulfoxide,which serves as both the carbonyl source and solvent,in the presence of trifluoroacetic acid to directly generate structurally diverse α-formylpyrrole derivatives in one pot in moderate to good yields.