Activation of Imines by Rare Earth Metal Triflates. Ln(OTf)3- or Sc(OTf)3-Catalyzed Reactions of Imines with Silyl Enolates and Diels-Alder Reactions of Imines - Kobayashi, Shû; Araki, Mitsuharu; Ishitani, Haruro; Nagayama, Satoshi; Hachiya, Iwao (Synlett, 1995)