Rearrangements of Bicyclic Nitrones to Lactams: Comparison of Photochemical and Modified Barton Conditions
作者:Yibin Zeng、Brenton T. Smith、John Hershberger、Jeffrey Aubé
DOI:10.1021/jo035004b
日期:2003.10.1
The rearrangement of nitrones to lactams can be carried out by photochemical activation or by treatment with Tf(2)O followed by KOH-promoted rearrangement (a modification of conditions originally introduced by Barton). Substrates in which the nitrone is part of a fused bicyclic ring system have traditionally proven problematic for this kind of reaction. In this study, a series of mono-, bi-, and tricyclic
将硝酮重排成内酰胺可以通过光化学活化或通过用Tf(2)O处理,然后进行KOH促进的重排(对Barton最初引入的条件的修改)来进行。传统上证明,其中硝酮是稠合双环系统一部分的底物对于这种反应是有问题的。在这项研究中,准备了一系列单环,双环和三环稠合的硝酮,以研究产物对硝酮环大小和系链长度的依赖性。结果表明,苯中硝酮的光化学重排可提供相当不错的内酰胺收率(30-68%),而两步非光化学过程可提供相同目标的平均收率稍高(30-95%)。