Okamoto, Iwao; Terashima, Masayuki; Masu, Hyuma; Nabeta, Mayumi; Ono, Kaori; Morita, Nobuyoshi; Katagiri, Kosuke; Azumaya, Isao; Tamura, Osamu Tetrahedron, 2011 , vol. 67, # 44 p. 8536 - 8543