Nakajima, Tadashi; Segi, Masahito; Sugimoto, Fumitosi; Hioki, Reiko; Yokota, Seiko; Miyashita, Kiyoshi Tetrahedron, 1993, vol. 49, # 37 p. 8343 - 8358 doi: 10.1016/S0040-4020(01)81918-9