摘要开发了一种简单有效的方法,在超声辐射下合成取代的咪唑并[1,2- a ]吡啶。使用离子液体作为催化剂进行反应。该反应过程证明了乙酰苯和2-氨基吡啶的底物范围广,并提供了对各种咪唑并[1,2- a ]吡啶的便捷通道。与传统的加热方法相比,本方法具有许多优点,例如产率更高,反应时间更短,反应条件更温和以及后处理步骤更容易。 图形概要
This paper discloses an iodine‐mediated CH thiolation strategy for introduction of dithiocarbamates onto imidazoheterocycles undermildconditions. Imidazole derivatives, including imidazopyridines, imidazothiazoles, and benzoimidazoles, were well tolerated to afford diverse imidazoheterocycles‐dithiocarbamates compounds. These compounds are expected to be significant for drug discovery.
Solvent and catalyst‐free synthesis of imidazo[1,2‐a]pyridines by grindstone chemistry
作者:Kumar Godugu、Chinna Gangi Reddy Nallagondu
DOI:10.1002/jhet.4164
日期:2021.1
The present work describes the solvent and catalyst‐free synthesis of imidazo[1,2‐a]pyridines in excellent to nearly quantitative yields from 2‐aminopyridines and a wide variety of ω‐bromomethylketones using a grindstone procedure at 25°C to 30°C for 3 to 5 minutes. The absolute structure of the compound, 2‐(3‐bromophenyl)‐7‐methylimidazo[1,2‐a]pyridine is determined by X‐ray crystallography. This
One-pot, microwave-assisted copper(<scp>i</scp>)-catalysed dithiocarbamation: facile introduction of dithiocarbamate on imidazopyridines
作者:Kritika Laxmikeshav、Akash P. Sakla、Stephy Elza John、Nagula Shankaraiah
DOI:10.1039/d1gc03952k
日期:——
A facile and proficient dithiocarbamation of imidazo[1,2-a]pyridines and other imidazoheterocycles with in situ generated dithiocarbamates is established using a water-soluble, stable copper(I) catalyst and molecular oxygen under microwave conditions. The reaction proceeds efficiently, tolerating a broad range of substrates, resulting in moderate to excellent yields. The intrinsic advantages of this
A direct and efficient protocol for thiocyanation of imidazoheterocycles accompanying with the hydrogen evolution under electrochemical oxidation has been described. Various important thiocyanated and selenocyanated imidazoheterocycles have been constructed through this method in moderate to excellent yields and can easily be scaled up. Further mechanistic studies suggest that aryl radical cation is
Copper catalyzed direct aerobic double-oxidative cross-dehydrogenative coupling of imidazoheterocycles with aryl acetaldehydes: an articulate approach for dicarbonylation at C-3 position
作者:S. M. Abdul Shakoor、Devesh S. Agarwal、Anil Kumar、Rajeev Sakhuja
DOI:10.1016/j.tet.2015.12.012
日期:2016.2
Direct aerobic oxidative cross-dehydrogenativecoupling of aryl acetaldehydes at C-3 position of imidazoheterocycles via copper catalyzed reaction resulted in the synthesis of dicarbonylated imidazoheterocycles in 55–85% yields. The methodology provides a straightforward, high yielding and one-pot approach towards the synthesis of C-3 dicarbonylated imidazoheterocycles without prior activation of C(sp2)-H
通过铜催化的反应,在咪唑杂环的C-3位置上的芳基乙醛直接好氧氧化交叉脱氢偶联,以55-85%的收率合成了二羰基咪唑杂环。该方法为C-3二羰基化的咪唑并杂环的合成提供了一种简单,高产且一锅的方法,而无需事先激活C(sp 2)-H或碱。这也报道了通过双氧化交叉脱氢过程在咪唑并[1,2- a ]吡啶体系上偶合芳基乙醛的第一种方法。