Akai, Shuji; Tsujino, Toshiaki; Fukuda, Nobuhisa; Iio, Kiyosei; Takeda, Yoshifumi; Kawaguchi, Ken-Ichi; Naka, Tadaatsu; Higuchi, Kazuhiro; Kita, Yasuyuki Organic Letters, 2001, vol. 3, # 25 p. 4015 - 4018 doi: 10.1021/ol016696y