6,12-Diphenyldibenzo[b,f][1,5]diazocine as an Electron-Capture Agent: Efficient Mechanistic Probe for SET Processes and Reagent for the Oxidative Dimerization of Benzylic Organometallics
作者:John J. Eisch、Kun Yu、Arnold L. Rheingold
DOI:10.1002/ejoc.201200278
日期:2012.6
respectively. This oxidative dimerization is potentially of practical preparative scope, since the hydrolysis byproduct, the indolo[3,2-b]indole, is conveniently reconverted into the starting diazocine reagent by oxidation with chromium trioxide in acetic acid. The formation of the indolo[3,2-b]indole as a byproduct in the carbometalation of the diazocine by various RLi and Grignard reagents offers a clue
在本研究中,6,12-二苯基二苯并[b,f][1,5]重氮辛,现在 X 射线衍射测量表明它具有一个桶状的八元中心环,已用钠或在 25°C 下在 THF 中使用锂金属,试图通过向中心重氮辛添加两个电子来形成平面的 Huckel-芳香二价阴离子。这种芳族二价阴离子的水解应该会产生原始重氮辛的异构体 5,12- 或 5,6- 二氢衍生物。实际上,水解后定量获得的唯一产物是有趣的四环环环还原产物 4b,9b-diphenyl-4b,5,9b,10-tetrahydroindolo[3,2-b]indole,其 3D 结构现已得到证实通过 X 射线晶体学和 13C 核磁共振光谱。优先 SET 跨环还原重氮辛以产生四环吲哚 [3,2-b] 吲哚二价阴离子,而不是平面的 Huckel 芳香族阴离子,这归因于在桶状重氮辛自由基阴离子中起作用的跨环电子稳定化。吲哚[3,2-b]吲哚二价阴离子的定量产生可用于