1. Laboratory of Modern Synthetic Organic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China, and Education Ministry Key Laboratory of Oil and Gas Fine Chemicals, XinJiang University, 14 Shengli Lu, Urumqi 830046, China zhaog@mail.sioc.ac.cn; awangjdl@xju.edu.cn