Chiral Phosphoric Acid-Catalyzed Asymmetric Aza-Friedel-Crafts Reaction of Indoles with Cyclic N-Acylketimines: Enantioselective Synthesis of Trifluoromethyldihydroquinazolines

An enantioselective aza-Friedel-Crafts (F-C) reaction of indoles with cyclic N-acylketimines has been developed. By using chiral phosphoric acid catalysts, a wide range of enantioenriched trifluoromethyldihydroquinazolines was obtained in excellent yields (up to 98%) with good to high enantioselectivities (up to 99% ee).