Okamoto, Kazuya; Sakagami, Masahiro; Feng, Fei; Togame, Hiroko; Takemoto, Hiroshi; Ichikawa, Satoshi; Matsuda, Akira Journal of Organic Chemistry, 2012, vol. 77, # 3 p. 1367 - 1377 doi: 10.1021/jo202159q