The development of high efficient and environmental friendly catalysts is an important effort in the study of asymmetric catalysis to construct potentially useful chiral molecules. Scandium( III ) ion is the most Lewis acidic as the smallest rare-earth-metal cation. The electronic properties of scandium cation offer its remarkably excellent outcomes m many organic reactions compared with traditional transition metals even with other lanthanide metals. Especially, Sc( OTf)3 features advantages as stability, recovery and reusability and has drawn intense attentions in the catalytic organic synthesis. In general, scandium ( III ) exhibits high coordination numbers as 6 and 7 which are highly advantageous for assembling various chiral and achiral ligands around the metal ions, thus creating an integrated chiral space in which the stereochemistry of the reaction might effectively be controlled.
