Novel and Efficient Synthesis of 2- and 4-N-Substituted Pyridine N-Oxides under Solvent-Free Conditions
摘要:
Displacement of 2-or 4-chloropyridine N-oxides, with nitrogen nucleophiles, under solvent-free conditions offers a simple route to scarce N-substituted pyridine N-oxides.
Regioselective synthesis of 4-functionalized pyridines
作者:Chao Li、Zixi Yan、Bingding Wang、Jiaxing Li、Weiping Lyu、Zhixing Wang、Ning Jiao、Song Song
DOI:10.1016/j.chempr.2023.10.015
日期:2024.2
pyridine derivatives. However, this reaction is still unexplored because of the inert property of pyridine and the challenge in the regioselectivity. Herein, we report an aromatic C-4 selective functionalization of pyridine -oxides with DABCO and TfO as the regioselective controller. The commercial availability of reagents, good tolerance of functional groups, and simple operability made it a promising
Quaternary <i>N</i>-(2-Pyridyl)-DABCO Salts: One-Pot in Situ Formation from Pyridine-<i>N</i>-oxides and Reactions with Nucleophiles: A Mild and Selective Route to Substituted <i>N</i>-(2-Pyridyl)-<i>N</i>′-ethylpiperazines
作者:Dmitry I. Bugaenko、Marina A. Yurovskaya、Alexander V. Karchava
DOI:10.1021/acs.joc.6b02952
日期:2017.2.17
simple, metal-free, one-pot synthetic procedure involves the initial reaction of activated heterocyclic N-oxides with DABCO, followed by in situ treatment of the resultant quaternary N-(2-pyridyl)-DABCO salts with nucleophiles, resulting in ring-opening. The method features mild reaction conditions, high positional selectivity, and excellent functional-group tolerance. The utility of our approach is demonstrated
Displacement of 2-or 4-chloropyridine N-oxides, with nitrogen nucleophiles, under solvent-free conditions offers a simple route to scarce N-substituted pyridine N-oxides.