Takano, Daisuke; Nagamitsu, Tohru; Ui, Hideaki; Shiomi, Kazuro; Yamaguchi, Yuuichi; Masuma, Rokuro; Kuwajima, Isao; Mura, Satoshi Tetrahedron Letters, 2001, vol. 42, # 16 p. 3017 - 3020 doi: 10.1016/S0040-4039(01)00355-0