Indium(III) chloride catalyzes the ring opening of chalcone epoxides
followed by intramolecular Friedel-Crafts alkylation under
mild conditions at room temperature to afford highly functionalized
3-aryl-2-hydroxy-2,3-dihydro-1H-inden-1-ones
in excellent yields (81-95%).
indium(III) chloride - intramolecular Friedel-Crafts alkylation - chalcones epoxides - epoxide ring opening - 2,3-dihydro-1H-inden-1-ones