Synthesis of tetrasubstituted furans by multicomponent reaction of alkynes with dichloro(ethyl)aluminum and carboxylic acid esters in the presence of Cp2TiCl2

A one-pot procedure has been developed for the synthesis of 3,4-dialkyl-2,5-dicycloalkyl(aryl, hetaryl)furans in 38–82% yield by reaction of symmetrical alkynes with cycloalkane(arene, hetarene)carboxylic acid esters and EtAlCl2 in the presence of Cp2TiCl2 as catalyst.