Electrochemical Oxidative (4 + 2) Cyclization of Anilines and <i>o</i>-Phenylenediamines for the Synthesis of Phenazines
作者:Peng-Fei Huang、Jia-Le Fu、Ying Peng、Ke-Wen Tang、Yu Liu
DOI:10.1021/acs.orglett.4c00851
日期:——
constituents of nitrogen-containing heterocycles, widely exist in functional compounds. Herein, we report an anodic oxidative (4 + 2) cyclization between anilines and o-phenylenediamines for the uniform construction of phenazines in a simple undivided cell. Dual C–H amination followed by oxidation represents an outstanding step and atom efficiency. A sequence of phenazines is produced with excellent functional
(SEO) induced tandem dual C–Hamination, we report a mild approach addressing the as-described issue via oxidative annulation of readily available anilines and o-phenylenediamines, which proceeds with a broad substrate scope and good functional group tolerance, directly uses primary amines as C–H aminating agents, employs a reusable nitrogen-doped carbon-supported cobalt nanocatalyst (Co-Nx/NC-800)
尽管氨基吩嗪具有广泛的应用,但由于原料的可用性有限以及控制合成选择性方面的挑战,仍然缺乏一种能够直接和多样化地获取此类化合物的有效方法。在这里,通过使用单电子氧化 (SEO) 诱导串联双 C-H 胺化的策略,我们报告了一种温和的方法,通过容易获得的苯胺和邻苯二胺的氧化环化来解决上述问题,该方法使用广泛的底物进行范围和良好的官能团耐受性,直接使用伯胺作为C-H胺化剂,采用可重复使用的氮掺杂碳负载钴纳米催化剂(Co-Nx / NC-800)和天然丰富的分子O 2,并表现出出色的步进和原子效率。发达的化学为构建各种难以用常规方法合成的有前途的氨基吩嗪提供了一个实用的平台,并为在可持续多相贱金属催化下进一步开发 SEO 诱导的有价值的转化铺平了道路。