Synthesis of [3a,7a]-Dihydroindoles by a Tandem Arene Cyclopropanation/3,5-Sigmatropic Rearrangement Reaction
作者:Sidney M. Wilkerson-Hill、Brandon E. Haines、Djamaladdin G. Musaev、Huw M. L. Davies
DOI:10.1021/acs.joc.8b00812
日期:2018.8.3
functionalization products arise from ring-opening of the [3+2]-cycloadducts. Computational studies suggest that the formal cycloaddition process takes places through a tandem arene cyclopropanation/6π electrocyclization/6π electrocyclic ring-opening/3,5-sigmatropic rearrangement reaction, which also accounts for the distinctive regioselectivity of the formal cycloaddition reaction.
供体/受体卡宾提供了构建分子复杂性的强大平台,但是它们的大多数反应仅限于芳基和乙烯基供体基团。我们发现含氮的供体/受体卡宾前体4-邻苯二甲酰亚胺基-N-甲磺酰基-1,2,3-三唑与未活化的芳烃反应,生成[3 + 2]-环加合物[3a,7a]的混合物]-二氢吲哚和正式的CH官能化产物,加热后产率高达82%。我们还证明了正式的CH功能化产物来自[3 + 2]-环加合物的开环。计算研究表明,正式的环加成过程是通过串联芳烃环丙烷/6π电环化/6π电环开环/3,5-σ重排反应进行的,