Makino, Kazuishi; Kimura, Ken-Ichi; Nakajima, Noriyuki; Hashimoto, Shun-Ichi; Yonemitsu, Osamu Tetrahedron Letters, 1996, vol. 37, # 50 p. 9073 - 9076 doi: 10.1016/S0040-4039(96)02132-6