Electrochemical-Induced Transfer Hydrogenation of Imidazopyridines with Secondary Amine as Hydrogen Donor
作者:Jiangwei Wen、Hongyun Qin、Kelu Yan、Xiaoting Yang、Xuejun Sun、Wei Wei、Jianjing Yang、Hua Wang
DOI:10.1021/acs.orglett.0c03205
日期:2020.11.20
Electrochemical-induced transferhydrogenation (TH) of N-heteroaromatic to construct biologically active functional molecule is an appealing and yet challenging task. We report herein the first selective transferhydrogenation of imidazopyridine derivatives with secondary amines as the hydrogen donors under electrochemical conditions. The successful conversion of cathode transferhydrogenation depends on the
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
Metal-free regioselective bromination of imidazo-heteroarenes: the dual role of an organic bromide salt in electrocatalysis
作者:Partha Pratim Sen、Vishal Jyoti Roy、Sudipta Raha Roy
DOI:10.1039/d1gc01069g
日期:——
tetra-n-butylammonium bromide (TBAB), as a brominating agent and as an electrolyte for the regioselective bromination of several imidazo heteroaromatic motifs. Instead of using a transition metal/external oxidant, this methodology utilized electron holes and electrons by means of anodic oxidation and cathodic reduction to form the desired products in good to excellent yields at ambient temperature. The method is simple
A visible-light-promoted cross-dehydrogenative-coupling reaction of N -arylglycine esters with imidazo[1,2- a ]pyridines
作者:Zhi-Qiang Zhu、Li-Jin Xiao、Chun-Cheng Zhou、Han-Lin Song、Zong-Bo Xie、Zhang-Gao Le
DOI:10.1016/j.tetlet.2018.07.047
日期:2018.8
cross-dehydrogenative-coupling reaction between N-arylglycine esters and imidazo[1,2-a]pyridines for the construction of CC bond was developed. A range of N-arylglycine esters and imidazo[1,2-a]pyridines were able to undergo the CDC reaction readily to afford α-heteroaryl substituted α-amino acid derivatives in good to excellent yields. A tentative mechanism for the photoredox reaction was also proposed. Importantly
N-芳基甘氨酸酯与咪唑并[1,2- a ]吡啶之间温和方便的可见光促进的交叉脱氢偶联反应被用于构建C C键。一系列的N-芳基甘氨酸酯和咪唑并[1,2- a ]吡啶能够很容易地进行CDC反应,从而以良好或优异的收率得到α-杂芳基取代的α-氨基酸衍生物。还提出了光氧化还原反应的初步机制。重要的是,在这种可见光促进的转化中使用铜(II)盐作为唯一催化剂使该反应可持续且实用。