Efficient synthesis of 2,3,4-trisubstituted furans from the reaction of activated acetylenes with ethyl bromopyruvate in the presence of enaminones
摘要:
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.
Synthesis of furan-2,3,4-tricarboxylate in biphasic water–Et2O solvent system
作者:Maryam Sabbaghan、Ali Yousefi
DOI:10.1007/s10593-015-1778-2
日期:2015.9
The reaction of dialkyl acetylenedicarboxylates with ethyl bromopyruvate or alpha-chlorocarbonyl compounds in the presence of 1,4-diazabicyclo[2.2.2]octane led to furan-2,3,4-tricarboxylates or the related 2-acetylfuran-3,4-dicarboxylates in excellent yield.