在(二乙酰氧基碘)苯的存在下,在环境温度下以短的反应时间,在吗啉对咪唑并吡啶的C-3处发生了迄今未报道的氨基甲基化。该方法也适用于吲哚嗪,咪唑并[2,1- b ]噻唑,苯并[ d ]咪唑并[2,1- b ]噻唑和吲哚。有趣的是,涉及吗啉作为亚甲基来源的氨基甲基化是一种新现象。该方案对于在温和的反应条件下合成氨基甲基化衍生物具有很大的潜力。
Use of Imidazo[1,2‐
<i>a</i>
]pyridine as a Carbonyl Surrogate in a Mannich‐Like, Catalyst Free, One‐Pot Reaction
作者:Gunaganti Naresh、Naga Rajiv Lakkaniga、Anupreet Kharbanda、Wei Yan、Brendan Frett、Hong‐yu Li
DOI:10.1002/ejoc.201801430
日期:2019.1.31
developed a simple and efficient protocol to aminomethylate the C‐3 position of imidazo[1,2‐a]pyridine through a multicomponent, decarboxylation reaction involving imidazo[1,2‐a]pyridine, a secondary amine, and glyoxylic acid. The developed protocol requires mild reaction conditions and furnishes diverse imidazo[1,2‐a]pyridine analogues from commercially available starting materials.
我们开发了一种简单而有效的协议来aminomethylate咪唑并[1,2的C-3位一个通过多组分]吡啶,脱羧反应涉及咪唑并[1,2一]吡啶,仲胺,和二羟乙酸。制定的方案要求反应条件温和,并从市售起始原料中提供多种咪唑并[1,2- a ]吡啶类似物。
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。
Derivatives of Imidazole. I. Synthesis and Reactions of Imidazo[1,2-α]pyridines with Analgesic, Antiinflammatory, Antipyretic, and Anticonvulsant Activity