Electrooxidation Enables Selective Dehydrogenative [4+2] Annulation between Indole Derivatives
作者:Chunlan Song、Kun Liu、Xu Jiang、Xin Dong、Yue Weng、Chien‐Wei Chiang、Aiwen Lei
DOI:10.1002/anie.202000226
日期:2020.4.27
route to highly functionalized pyrimido[5,4-b]indoles under oxidant- and metal-free conditions. Notably, this electrochemical approach maintains excellent functional-group tolerance and can be extended as a modification tactic for pharmaceutical research. Preliminary mechanism studies indicate that the electrooxidation annulation proceeds through radical-radical cross-coupling between an indole radical
吲哚的脱芳香环化已成为制备多环基于吲哚啉的生物碱的有力工具。与针对五元环稠合的二氢吲哚的成熟方法相比,六元环稠合的二氢吲哚在热条件下极少接触。在本文中,通过电化学途径发展了不同吲哚之间的脱芳香性[4 + 2]环状。这种转变在无氧化剂和无金属的条件下为高度官能化的嘧啶并[5,4-b]吲哚提供了显着的区域选择性和立体选择性。值得注意的是,这种电化学方法保持了优异的官能团耐受性,并且可以扩展为药物研究的修饰策略。