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.
One-Pot Synthesis of Phenol Derivatives by the Novel Intramolecular Alder–Rickert Reaction: Effects of Aryl Substituent at the 3-Position of Cyclohexenone Derivatives on Reactivity
We examined In(OTf)3-catalyzed enolization and intramolecular Alder-Rickert reactions of cyclohexenone derivatives. The 3-aryl substituted cyclohexenone derivatives bearing an ethoxycarbonyl-substituted alkyne moiety could be converted into the corresponding phenols in comparatively good yield.