Taguchi, Takeo; Kawara, Akihiro; Watanabe, Shotaro; Oki, Yukihiro; Fukushima, Hisashi; et al. Tetrahedron Letters, 1986, vol. 27, # 42 p. 5117 - 5120 doi: 10.1016/S0040-4039(00)85148-5