在此,我们公开了一种铑( II )催化的由2-喹诺酮类和N-磺酰基-1,2,3-三唑合成2-氨基喹啉衍生物的高效且便捷的方法。该反应可以快速获得一系列 2-氨基喹啉,产率中等至优异。该反应通过喹诺酮-羟基喹啉互变异构/O-H插入到铑( II )-氮杂乙烯基卡宾中间体中进行,该中间体是通过三唑脱氮产生的,然后重排以产生所需的产物。此外,我们还证明了碘介导的 2-氨基喹啉衍生物的脱烷基化。
From Pyridine-<i>N</i>-oxides to 2-Functionalized Pyridines through Pyridyl Phosphonium Salts: An Umpolung Strategy
作者:Dmitry I. Bugaenko、Marina A. Yurovskaya、Alexander V. Karchava
DOI:10.1021/acs.orglett.1c02165
日期:2021.8.6
The reactions of pyridine-N-oxides with Ph3P under the developed conditions provide an unprecedented route to (pyridine-2-yl)phosphonium salts. Upon activation with DABCO, these salts readily serve as functionalized 2-pyridyl nucleophile equivalents. This umpolung strategy allows for the selective C2 functionalization of the pyridine ring with electrophiles, avoiding the generation and use of unstable
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
[EN] 7-NITRO-8-HYDROXYQUINOLINE DERIVATIVE, PREPARATION METHOD THEREFOR AND MEDICAL USE THEREOF<br/>[FR] DÉRIVÉ DE 7-NITRO-8-HYDROXYQUINOLÉINE, SON PROCÉDÉ DE PRÉPARATION ET UTILISATION MÉDICALE ASSOCIÉE<br/>[ZH] 7-硝基-8-羟基喹啉衍生物、其制备方法及其医药用途