imidazoheterocycles has been developed through sp2 C–Hbondfunctionalization with molecular iodine in water at room temperature. The reaction is catalyzed by an imidazole-based zwitterion-type molten salt. A library of iodo-substituted imidazo[1,2-a]pyridines with broad functionality have been synthesized. This methodology is also applicable to imidazo[2,1-b]thiazole and imidazole scaffolds. An environmentally
摘要 通过室温下水中的分子碘与sp 2 C–H键的官能化作用,开发了咪唑杂环杂环碘化的环境友好方案。该反应由基于咪唑的两性离子型熔融盐催化。已经合成了具有广泛功能的碘取代的咪唑并[1,2- a ]吡啶的文库。该方法学也适用于咪唑并[2,1- b ]噻唑和咪唑支架。 通过室温下水中的分子碘与sp 2 C–H键的官能化作用,开发了咪唑杂环杂环碘化的环境友好方案。该反应由基于咪唑的两性离子型熔融盐催化。已经合成了具有广泛功能的碘取代的咪唑并[1,2- a ]吡啶的文库。该方法学也适用于咪唑并[2,1- b ]噻唑和咪唑支架。
Copper catalyzed tandem oxidative C–H amination/cyclizations: Direct access to imidazo[1,2-a]pyridines
and convenient strategy is described for the synthesis of imidazo[1,2-a]pyridines via inexpensive copper-catalyzed tandem imine formation and intramolecular aerobic oxidative C–H bond amination/cyclizations. An array of imidazo[1,2-a]pyridines were prepared by the reaction of readily available acetophenones and 2-aminopyridines in good to excellent yields (48–92%). The scope of the method was validated
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
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。
Synthesis of imidazole-fused nitrogen-bridgehead heterocycles catalysed by lipase and their antifungal and antimicrobial bioactivity
作者:Manjit Singh、Manisha Malviya、Vijay B. Yadav、Aishwarya Nikhil、Munesh Gupta
DOI:10.1039/d3ra07145f
日期:——
An effective approach for selective C–N bond formation for synthesising imidazo[1,2-a] pyridine-based heterocycles using porcine pancreatic lipase (PPL) as a biocatalyst has been devised.
An ultrasound-assisted expedient protocol has been developed for the synthesis of imidazo[1,2-a]pyridines and imidazo[2,1-b]thiazoles by the C–H functionalization of ketones using a KI/tert-butyl hydroperoxide catalytic system. The reaction takes place in water, a green solvent, and does not require a metal catalyst; it also gives good yields of the products. The method offers numerous noteworthy characteristics
开发了一种超声辅助的简便方案,用于使用 KI/叔丁基过氧化氢催化系统通过酮的 C-H 官能化来合成咪唑并[1,2- a ]吡啶和咪唑并[2,1- b ]噻唑。反应在水这种绿色溶剂中进行,不需要金属催化剂;它还提供了良好的产品产量。该方法具有许多值得注意的特点,包括温和的反应条件、不存在碱、广泛的官能团兼容性和优异的反应产率。此外,它避免了使用昂贵且对空气敏感的化学品,并且可以在环境反应条件下进行。