Synthesis of 2-alkenyl-3-(alkoxycarbonyl)furans based on Feist-Benary cyclocondensation of (2,4-dioxobutylidene)phosphoranes with α-haloketones and α-chloracetaldehyde

3-Acyl-2-alkenylfurans were prepared by Feist-Benary cyclocondensation of (2,4-dioxobutylidene) phosphoranes with chloracetaldehyde and alpha-haloketones and subsequent Wittig reactions.