1. Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
2. Department of Chemistry, Engineering Center of Catalysis and Synthesis for Chiral Molecules, Fudan University, Shanghai Engineering Research Center of Industrial Asymmetric Cataly sis of Chiral Drugs, 220 Handan Road, Shanghai 200433, P.R. China