N-Heterocyclic Carbene Catalyzed Intramolecular Hydroacylation of Activated Alkynes: Synthesis of Chromones

An organocatalytic intramolecular Stetter-type hydroacylation reaction between an aldehyde and an activated alkyne has been developed. This study induces salicylaldehyde-derived alkyne derivatives to assemble into a series of chromone derivatives using a catalytic amount of thiazolium-based carbene catalyst.