作者:Koichi Natori、Taizo Iwayama、Osamu Yamabe、Yuichi Kitamoto、Hiroshi Ikeda、Kenkichi Sakamoto、Tetsutaro Hattori、Sotaro Miyano
DOI:10.1002/chir.22447
日期:2015.8
Two analogs of blestriarene C (4,4'‐dimethoxy‐1,1'‐biphenanthrene‐2,2',7,7'‐tetraol) bearing no 7,7'‐dihydroxy (3) and 4,4'‐dimethoxy groups 4 were prepared. Unlike blestriarene C (1), compounds 3 and 4, as well as 1,1'‐biphenanthrene‐2,2'‐diol (5), do not racemize under fluorescent lamp illumination. Cyclic voltammetry analysis reveals that compound 1 has a lower half‐wave potential (E1/2) than compounds
blestriarene C的两个类似物(4,4'-dimethoxy-1,1'-biphenanthrene-2,2',7,7'-tetraol)不带有7,7'-dihydroxy(3)和4,4'-dimethoxy组4制备。与三烯C(1)不同,化合物3和4以及1,1'-联菲-2,2'-二醇(5)在荧光灯照明下不会消旋。循环伏安法分析表明,化合物1具有较低的半波电势(Ë 1/2)比化合物3,4,5,这表明氧化还原循环中涉及的外消旋化。化合物1通过吸收对应于1 L b波段的紫外光而消旋。反应期间,未观察到副产物。在氮气氛下,外消旋作用受到显着抑制。基于这些观察,我们为化合物1的简单外消旋化提出了一种可行的机制,该机制是由可逆的光诱导氧氧化原位产生的阳离子自由基介导的。手性27:479-486,2015年。©2015 Wiley Periodicals,Inc.