Takano, Seiichi; Inomata, Kohei; Tomita, Shun'ichi; Yanase, Masashi; Samizu, Kyiohiro; Ogasawara, Kunio Tetrahedron Letters, 1988, vol. 29, # 50 p. 6619 - 6620 doi: 10.1016/S0040-4039(00)82412-0