Griesbaum, Karl; Kim, Woo-Sun; Nakamura, Norinaga; Mori, Mitsuyuki; Nojima, Masatomo; Shigekazu, Kusabayashi Journal of Organic Chemistry, 1990, vol. 55, # 25 p. 6153 - 6161 doi: 10.1021/jo00312a022