Oxidative Cross-Coupling of sp<sup>3</sup>- and sp<sup>2</sup>-Hybridized C–H Bonds: Vanadium-Catalyzed Aminomethylation of Imidazo[1,2-<i>a</i>]pyridines
作者:Pinku Kaswan、Ashley Porter、Kasiviswanadharaju Pericherla、Marissa Simone、Sean Peters、Anil Kumar、Brenton DeBoef
DOI:10.1021/acs.orglett.5b02539
日期:2015.11.6
The vanadium-catalyzed oxidative coupling of substituted 2-arylimidiazo[1,2-a]pyridines to N-methylmorpholine oxide, which acts as both a coupling partner and an oxidant, has been achieved. This reaction was applied to various substituted imidiazo[1,2-a]pyridine and indole substrates, resulting in yields as high as 90%. Mechanistic investigations indicate that the reaction may proceed via a Mannich-type
已经实现了取代的2-芳基咪唑并[1,2- a ]吡啶对N-甲基吗啉氧化物的钒催化氧化偶联,N-甲基吗啉既是偶联剂又是氧化剂。该反应用于各种取代的咪唑并[1,2- a ]吡啶和吲哚底物,产率高达90%。机理研究表明该反应可以通过曼尼希型过程进行。这项工作证明了如何将氧化氨基甲基化用作将叔胺引入杂环的有用方法,从而为常规曼尼希型反应提供了另一种方法。