Electrochemical Arylation of Electron‐Deficient Arenes through Reductive Activation
作者:Pan Wang、Zhenlin Yang、Ziwei Wang、Chenyang Xu、Lei Huang、Shengchun Wang、Heng Zhang、Aiwen Lei
DOI:10.1002/anie.201909600
日期:2019.10.28
An electrochemical method has been developed to achieve arylation of electron-deficientarenes through reductive activation. Various electron-deficientarenes and aryldiazonium tetrafluoroborates are amenable to this transformation within the conditions of an undivided cell, providing the desired products in up to 92 % yield. Instead of preparing diazonium reagents, these reactions can begin from anilines
Direct Zincation of Functionalized Aromatics and Heterocycles by Using a Magnesium Base in the Presence of ZnCl<sub>2</sub>
作者:Zhibing Dong、Giuliano C. Clososki、Stefan H. Wunderlich、Andreas Unsinn、Jinshan Li、Paul Knochel
DOI:10.1002/chem.200801558
日期:2009.1.2
A wide range of polyfunctional aryl and heteroaryl zinc reagents were efficiently prepared in THF by using (TMP)2Mg⋅2 LiCl (TMP=2,2,6,6‐tetramethylpiperamidyl) in the presence of ZnCl2. The possible pathways of this metalation procedure as well as possible reactive intermediates are discussed. This experimental protocol expands the tolerance of functional groups and allows an efficient zincation of
An efficient and mild ortho-zincation of aromatics and heterocycles by using TMP2Mg·2LiCl in the presence of ZnCl2
作者:Zhi-Bing Dong、Wei-Hua Zhu、Zhi-Guang Zhang、Min-Zhi Li
DOI:10.1016/j.jorganchem.2009.12.016
日期:2010.3
A variety range of functionalized aryl and heteroaryl zinc reagents were efficiently generated by using TMP2Mg center dot 2LiCl (TMP = 2,2,6,6-tetramethylpiperamidyl) in the presence of ZnCl2. The subsequently functionalization gave after reaction with electrophiles the expected polyfunctionalized products in good yields. A detailed study concerned on the point how we found the protocol and how we optimized it was depicted. (C) 2009 Elsevier B.V. All rights reserved.
Accelerated Zincations for an Efficient and Mild Functionalization of Aromatics and Heterocycles
作者:Andreas Unsinn、Stefan H. Wunderlich、Paul Knochel
DOI:10.1002/adsc.201300049
日期:2013.3.25
process for the preparation of aromatic and heteroaromatic diorganozincreagents and their subsequent reaction with electrophiles is presented. The new method, featuring the use of a 2,2,6,6‐tetramethylpiperidyl (TMP) magnesium base in the presence of zinc chloride (ZnCl2), is superior to the previous methods, which require the preparation of zinc bases. Specifically, the shorter reaction times under mild