Matsushita, Yoh-ichi; Sugamoto, Kazuhiro; Iwakiri, Yoshihisa; Yoshida, Satoru; Chaen, Takehito; Matsui, Takanao Tetrahedron Letters, 2010, vol. 51, # 30 p. 3931 - 3934 doi: 10.1016/j.tetlet.2010.05.090