Regioselective Reaction between Maltol and Vinyltriphenylphosphonium Salts: An Efficient One-Pot Synthesis of a Novel Class of Dihydrofuran and Cyclobutene Derivatives

Abstract

The reaction of 2-methyl-3-hydroxy-4H-pyrane-4-one (maltol) with dialkyl acetylenedicarboxylates in the presence of triphenylphosphine in CH 2 Cl 2 at room temperature leads to the unknown fused furan and cyclobutene derivatives, and functionalized olefins in fairly high yields.