1. Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province, Department of Chemistry, Xihua University, Chengdu 610041, P. R. China
2. Asymmetric Synthesis and Chiraltechnology Key Laboratory of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, P. R. China
3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China