Four new compounds 1—4 were obtained from an oxidative coupling reaction of (E)-isorhapontigenin using FeCl3 as oxidant. Their structures and stereochemistry were determined on the basis of spectroscopic evidence [UV, IR, MS, 1H-, 13C-NMR, NOE and 2D NMR], and their possible formation mechanisms were also discussed, respectively.
以 FeCl3 为氧化剂,通过 (E)-isorhapontigenin 的氧化偶联反应得到了四个新化合物 1-4。根据光谱证据[UV、IR、MS、1H-、13C-NMR、NOE 和 2D NMR]确定了它们的结构和立体
化学性质,并分别讨论了它们可能的形成机制。