Asymmetric Conjugate Addition of O-Benzylhydroxylamine to α,β-Unsaturated 3-Acyloxazolidin-2-ones Catalyzed by Sc(OTf)3/i-Pr-Pybox Complex - Kikuchi, Satoshi; Sato, Hiroaki; Fukuzawa, Shin-ichi (Synlett, 2006)