Abstract The reaction of dialkyl acetylenedicarboxylates or diaroylacetylenes with ethyl bromopyruvate in the presence of enaminones led to 2-ethyl 3, 4-dialkyl 4-bromo-4, 5- dihydro-2, 3, 4-furantricarboxylates or ethyl 3, 4-diaroyl-4-bromo-4, 5-dihydro-2- furancarboxylate in excellent yields. These compounds are quantitatively converted to the corresponding 2, 3, 4-trisubstituted furans by 4-dimethylaminopyridine.
