Chemo- and Regioselective Asymmetric Friedel–Crafts Reaction of Furans and Thiophenes with α,β-Unsaturated Aldehydes through Dual Activation

Abstract

A highly chemo- and regioselective Friedel–Crafts alkylation reaction of furans and thiophenes has been developed, which relies on the activation from the remote conjugated Mukaiyama silyl enol ether motif. Excellent enantioslectivity is generally obtained in reactions with α,β-unsaturated aldehydes under the well-established iminium ion catalysis of a chiral secondary amine.