Fujita, Tetsuro; Hamamichi, Norimitsu; Matsuzaki, Tohru; Kitao, Yuki; Kiuchi, Masatoshi; Node, Manabu; Hirose, Ryoji Tetrahedron Letters, 1995, vol. 36, # 47 p. 8599 - 8602 doi: 10.1016/0040-4039(95)01823-Z