Kodama, Mitsuaki; Yoshio, Suzuyo; Tabata, Tomoki; Deguchi, Yuka; Sekiya, Yasumi; Fukuyama, Yoshiyasu Tetrahedron Letters, 1997, vol. 38, # 26 p. 4627 - 4630 doi: 10.1016/S0040-4039(97)00992-1