Kigoshi, Hideo; Suenaga, Kiyotake; Mutou, Tsuyoshi; Ishigaki, Takeshi; Atsumi, Toshiyuki; Ishiwata, Hiroyuki; Sakakura, Akira; Ogawa, Takeshi; Ojika, Makoto; Yamada, Kiyoyuki Journal of Organic Chemistry, 1996, vol. 61, # 16 p. 5326 - 5351 doi: 10.1021/jo9606113