Xu, Qian-Qian; Zhao, Qun; Shan, Guang-Sheng; Yang, Xi-Cheng; Shi, Qi-Yuan; Lei, Xinsheng Tetrahedron, 2013, vol. 69, # 50 p. 10739 - 10746 doi: 10.1016/j.tet.2013.10.064