Geldbach, Tilmann J.; Dyson, Paul J.
Journal of the American Chemical Society, 2004 , vol. 126, # 26 p. 8114 - 8115

Watanabe, Tadashi; Hiratsuka, Akira; Aizawa, Toshiko; Sawahata, Tadashi
Tetrahedron Letters, 1982 , vol. 23, # 11 p. 1185 - 1188