Rhodium(III)-Catalyzed CH Activation and Indole Synthesis With Hydrazone as an Auto-Formed and Auto-Cleavable Directing Group
作者:Liyao Zheng、Ruimao Hua
DOI:10.1002/chem.201304302
日期:2014.2.17
An efficient, practical, and external‐oxidant‐free indole synthesis from readily available aryl hydrazines was developed, by using hydrazone as a directing group for RhIII‐catalyzed CH activation and alkyne annulation. The hydrazone group was formed by in situ condensation of hydrazines and CO source, whereas its NN bond was served as an internal oxidant, for which we termed it as an auto‐formed
通过使用as作为Rh III催化的CH活化和炔烃环化反应的导向基团,开发了一种有效,实用且无外部氧化剂的吲哚合成方法。腙基通过在肼和CO源的就地缩合形成,而其N N键送达作为内部氧化剂,对此我们称之为它作为一个自动形成和自动裂解的定向基团(DG自动) 。该方法无需任何步骤即可进行导向组的预安装和后裂解,这使其成为一种非常容易扩展的方法,可以以较高的步骤经济性来获得不受保护的吲哚。DG汽车该策略也适用于异喹啉合成。此外,还证明了该化学方法可用于快速组装π扩展的氮掺杂多杂环化合物和生物活性分子。