SPINOL-Derived Phosphoric Acids: Synthesis and Application in Enantioselective Friedel−Crafts Reaction of Indoles with Imines
摘要:
A new class of chiral phosphoric acids with spirobiindane s scaffold were conveniently synthesized from (S)-1,1'-spirobiindane-7,7'-diol ((S)-SPINOL) and employed to catalyze the asymmetric Friedel-Crafts reaction of in-doles with imines to afford 3-indolylmethanamines. High yields (68-97%) and excellent enantioselectivities (up to 99% ee) were obtained.