Oxidative Coupling of Carbazoles: A Substituent-Governed Regioselectivity Profile
作者:Sudesh Mallick、Sudhakar Maddala、Kalidass Kollimalayan、Parthasarathy Venkatakrishnan
DOI:10.1021/acs.joc.8b02322
日期:2019.1.4
(metal-free) recyclable oxidants, such as DDQ or CA/H+, for accessing bicarbazole regioisomers. Differently substituted carbazoles are examined to showcase regioselective discrimination (3,3′- versus 1,3′-bicarbazoles) and preferences based on sterics and electronics in oxidative coupling. Finally, a mechanism that involves the carbazole radical cation has been traced (evidenced) and proposed on the basis of the
在存在有机(无金属)可循环使用的氧化剂(例如DDQ或CA / H +)的情况下,具有各种取代基的咔唑的氧化C-C偶联反应证明了该化合物可与联咔唑区域异构体接触。对不同取代的咔唑进行了研究,以显示区域选择性的区别(3,3'-与1,3'-联咔唑)和在氧化偶联中基于空间和电子学的偏好。最终,已经找到(证明)了涉及咔唑自由基阳离子的机理,并在紫外可见近红外吸收和EPR光谱结果的基础上提出了一种机理。这项研究强调了以有效方式对一系列联咔唑进行战略化学制备的方法。