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The synthesis of methyl 4-(methoxymethyl)furo[3,2-b]pyrrole-5-carboxylate (1d) and methyl 2formyl-4-(methoxymethyl)furo[3,2-b]pyrrole-5-carboxylate (2d) is described. The effect of microwave irradiation on the condensation reactions of methyl 2-formylfuro[3,2-b]pyrrole-5carboxylates 2a-2d and methyl 2-formylfuro[2,3-b]pyrrole-5-carboxylates 3a-3d with active methylene compounds as are: 2-thioxothiazolidine-4-one (rhodanine), 2-thioxoimidazolidine-4one (thiohydantoine), and 3-amino-2-thioxothiazolidine-4-one (3-aminorhodanine) was studied and compared with "classical" conditions. The results show that microwave irradiation shortens the reaction time while maintaining comparable yields.

Effect of microwave irradiation on reaction of furo[3,2-b]pyrrole and furo[2,3-b]pyrrole-2-carbaldehydes with some active methylene compounds