Reaction of Pyridine‐
<i>N</i>
‐Oxides with Tertiary sp
<sup>2</sup>
‐
<i>N</i>
‐Nucleophiles: An Efficient Synthesis of Precursors for
<i>N</i>
‐(Pyrid‐2‐yl)‐Substituted
<i>N</i>
‐Heterocyclic Carbenes
作者:Dmitry I. Bugaenko、Marina A. Yurovskaya、Alexander V. Karchava
DOI:10.1002/adsc.202001063
日期:2020.12.22
N‐(Pyrid‐2‐yl)‐substituted azolium and pyridinium salts, precursors for hybrid NHC‐containing ligands, were obtained with excellent regioselectivity, employing a deoxygenative CH‐functionalization of pyridine‐N‐oxides with substituted imidazoles, thiazoles, and pyridine. Unlike the traditional SNAr‐based methods, this approach provides high yields for substrates bearing substituents of different electronic
通过使用取代的咪唑,噻唑和吡啶对吡啶-N-氧化物进行脱氧CH-官能团化反应,获得了具有出色的区域选择性的N-(吡啶-2-基)-取代的azo盐和吡啶鎓盐,具有优异的区域选择性。。与传统的基于S N Ar的方法不同,此方法可为带有不同电子性质取代基的底物提供高收率。吡啶基取代的咪唑基-2-硫酮,苯并二氮杂以及2-氨基吡啶的合成也突出了如此制备的偶氮盐和吡啶鎓盐的用途。