Yokokawa, Fumiaki; Sugiyama, Hideyuki; Shioiri, Takayuki; Katagiri, Noriko; Oda, Osamu; Ogawa, Hiroshi Tetrahedron, 2001, vol. 57, # 22 p. 4759 - 4766 doi: 10.1016/S0040-4020(01)00399-4