Liu, Pingli; Huang, Liang; Lu, Yuelie; Dilmeghani, Mina; Baum, Jean; Xiang, Tingjian; Adams, Jeff; Tasker, Andrew; Larsen, Rob; Faul, Margaret M. Tetrahedron Letters, 2007 , vol. 48, # 13 p. 2307 - 2310