Synthesis of Highly Substituted Arenes via Cyclohexadiene–Alkene C–H Cross Coupling and Aromatization
作者:Anup Bhunia、Armido Studer
DOI:10.1021/acscatal.8b00083
日期:2018.2.2
The development of a cross-coupling method for the regioselective β-alkenylation of 2,5-cyclohexadiene carboxylic acid derivatives to form ortho-alkenylarenes through in situ decarboxylation and aromatization is described. The carboxylic acid functionality is used as a traceless directing group for efficient and mild β-alkenylation. The modular sequence comprises a reductive Birch α-alkylation, ionic
描述了交叉偶联方法的发展,该交叉偶联方法用于2,5-环己二烯羧酸衍生物的区域选择性β-烯基化以通过原位脱羧和芳构化形成邻烯基芳烃。羧酸官能团用作有效且温和的β-烯基化反应的无痕导向基团。模块化序列包括还原桦木α烷基化,离子δ烷基化,接着通过Pd催化的脱羧β烯基化,随后芳构化导致整体三倍本位-对位-邻位容易访问的苯甲酸衍生物的官能化。提出了在温和条件下以中等至极好的收率高效合成各种烷基-烯基芳烃的方法。