Yamamoto, Takeshi; Ogura, Miharu; Amano, Akira; Adachi, Kenichiro; Hagiwara, Toshimitsu; Kanisawa, Tsuneyoshi Tetrahedron Letters, 2002, vol. 43, # 50 p. 9081 - 9084 doi: 10.1016/S0040-4039(02)02312-2