Sunazuka, Toshiaki; Shirahata, Tatsuya; Yoshida, Kiminari; Yamamoto, Daisuke; Harigaya, Yoshihiro; Nagai, Takayuki; Kiyohara, Hiroaki; Yamada, Haruki; Kuwajima, Isao; Omura, Satoshi Tetrahedron Letters, 2002, vol. 43, # 7 p. 1265 - 1268 doi: 10.1016/S0040-4039(01)02348-6