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.