Futagami, Shin; Ohashi, Yoriko; Imura, Koreaki; Hosoya, Takamitsu; Ohmori, Ken; Matsumoto, Takashi; Suzuki, Keisuke Tetrahedron Letters, 2000, vol. 41, # 7 p. 1063 - 1067 doi: 10.1016/S0040-4039(99)02235-2