Regioselective reaction between maltol and vinyltriphenylphosphonium salts: An efficient one-pot synthesis of a novel class of dihydrofuran and cyclobutene derivatives

摘要

The reaction of 2-methyl-3-hydroxy-4H-pyrane-4-one(maltol) with dialkyl acetylenedicarboxylates in the presence of triphenylphosphine in CH2Cl2 at room temperature leads to the unknown fused furan and cyclobutene derivatives, and functionalized olefins in fairly high yields.