Synthesis of substituted furan-3-carboxylates from alkyl 3-bromo-3-nitroacrylates

Carbonyl-containing furan-3-carboxylates were obtained by the refluxing of alkyl 3-bromo-3-nitroacrylates and acyclic CH-acids, namely, pentane-2,4-dione and alkyl 3-oxobutanoates in methanol in the presence of equimolar amounts of potassium acetate. The products can be prepared by the similar processing of 2-nitro-2,3-dihydrofuran-3-carboxylates being the intermediates in the total transformation.