Toyooka, Naoki; Yoshida, Yasuko; Momose, TakefumiToyooka, Naoki; Yoshida, Yasuko; Yotsui, Yasuhito; Momose, Takefumi Tetrahedron LettersJournal of Organic Chemistry, 19951999, vol. 3664, # 2113 p. 3715 - 37184914 - 4919 doi: 10.1016/0040-4039(95)00661-U10.1021/jo990397t