Matsumura, Yoshihiro; Shirai, Kimihiro; Maki, Toshihide; Itakura, Yoichi; Kodera, Yukihiro Tetrahedron Letters, 1998, vol. 39, # 16 p. 2339 - 2340 doi: 10.1016/S0040-4039(98)00148-8