Base‐Promoted Difunctionalization of Alkynes: One‐Pot Synthesis of Polysubstituted Chromones

Abstract A transition‐metal‐free one‐pot procedure for the difunctionalization of alkynes by C−C triple bond oxidation and transformation towards chromone derivatives has been developed. It involves cascade reactions for carbonylation of alkynes, base‐promoted C−C σ‐bond cleavage, and intramolecular cyclization. This procedure provides an efficient protocol for the synthesis of polysubstituted chromones from readily available starting materials.