New Methods of Synthesis of Fused Maleimides

The review covers publications over the past decade on new methods of synthesis of pyrrolo[3,4-b]­pyrrole-4,6(1H,5H)-diones, 4H-thieno[2,3-c]pyrrole-4,6(5H)-diones, 4H-pyrrolo[3,4-d][1,3]thiazole-4,6(5H)-di­ones, 5H-pyrrolo[3,4-b]pyridine-5,7(6H)-diones, 1H-pyrrolo[3,4-c]pyridine-1,3(2H)-diones, and other male­imide-fused heterocycles. Both methods for the construction of maleimide ring and those based on reactions of N-substituted maleimides, 3,4-dihalomaleimides, and other maleimide derivatives are considered.