Takano, Seiichi; Kamikubo, Takashi; Sugihara, Takumichi; Suzuki, Mikio; Ogasawara, Kunio Tetrahedron: Asymmetry, 1993, vol. 4, # 2 p. 201 - 204 doi: 10.1016/S0957-4166(00)82337-X