a
Key Laboratory for Asymmetric Synthesis and Chiral technology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, China
E-mail: xmzhang@cioc.ac.cn
;
Fax: (+86) 28-85257883
;
Tel: (+86) 28-85257883
b
University of Chinese Academy of Sciences, Beijing, China