Synthesis of Phenol Derivatives from Cyclohex-2-enones Bearing an Alkyne through Lewis Acid-Catalyzed Enolization and Intramolecular Alder–Rickert Reaction

A cationic rhodium­(I) complex- or In­(OTf)₃-catalyzed synthesis of phenol derivatives from cyclohex-2-enone having an ethoxycarbonyl-substituted alkyne has been achieved. This reaction proceeds via enolization and an intramolecular Alder–Rickert reaction