Feng, Xin-Liang; Zhang, Ye; Lin, Zheng-Huan; Zhao, Cheng-Xue; Chow, Tahsin
Heterocyclic Communications, 2005 , vol. 11, # 5 p. 427 - 432

Mi, Xueling; Luo, Sanzhong; He, Jiaqi; Cheng, Jin-Pei
Tetrahedron Letters, 2004 , vol. 45, # 23 p. 4567 - 4570