已开发出一种高效的钴催化的C–S / C–Se键形成方法,用于合成苯并[ b ]硫代/硒烯稠合的咪唑并[1,2- a ]吡啶。该方案由廉价且可商购的钴催化剂催化,而无需使用额外的还原剂,同时使用硫氰酸盐和硒氰酸盐作为硫和硒源。以高收率获得了多种苯并[ b ]硫代/硒吩并基的咪唑并[1,2- a ]吡啶。
One-Pot Synthesis of Naphtho[1′,2′:4,5]imidazo[1,2-<i>a</i>
]pyridin-5-yl(aryl)methanones through Sequential Sonogashira Coupling/Alkyne-Carbonyl Metathesis
作者:Mirza Feroz Baig、Siddiq Pasha Shaik、Namballa Hari Krishna、Neeraj Kumar Chouhan、Abdullah Alarifi、Ahmed Kamal
DOI:10.1002/ejoc.201700496
日期:2017.7.25
An efficient one-pot route for the construction of naphtho[1′,2′:4,5]imidazo[1,2-a]pyridin-5-yl(aryl)methanones and 5-phenylnaphtho[1′,2′:4,5]imidazo[1,2-a]pyridines by sequential Sonogashira coupling reaction followed by trifluoroacetic acid promoted alkyne-carbonyl metathesis (ACM) has been developed. 2-(2-Bromophenyl)imidazo[1,2-a]pyridine-3-carbaldehyde preferentially underwent ACM with phenyl
A simple and highly efficient protocol for the regioselectivesynthesis of azole-substituted imidazo[1,2-a]pyridines has been developed using a ligand-free, copper-catalyzed Ullmann-type C–N coupling of 2-(2-bromophenyl)imidazo[1,2-a]pyridines with different azoles and in situ generated 1,2,3-triazoles. The reactions proceeded smoothly to furnish azolo-imidazo[1,2-a]pyridines in good to excellent yields
Copper-Mediated C–H Amination of Imidazopyridines with <i>N</i>-Fluorobenzenesulfonimide
作者:Shuai Lu、Lu-Lu Tian、Tian-Wei Cui、Yu-Shen Zhu、Xinju Zhu、Xin-Qi Hao、Mao-Ping Song
DOI:10.1021/acs.joc.8b02348
日期:2018.11.16
A copper-mediated direct C3 amination of imidazopyridines has been disclosed under additive-free conditions in short reaction times. This methodology utilizes commercially available N-fluorobenzenesulfonimide (NFSI) as the amino source, which exhibits broad substrate scope and good functional group tolerance. The obtained C3-aminated imidazopyridines can undergo further desulfonylation transformations
One-Pot Cascade Reactions Leading to Pyrido[2′,1′:2,3]imidazo[4,5-<i>c</i>][1,2,3]triazolo[1,5-<i>a</i>]quinolines under Bimetallic Relay Catalysis with Air as the Oxidant
作者:Ze Wang、Bin Li、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.6b00996
日期:2016.8.5
3-triazole/quinoline-fused imidazo[1,2-a]pyridines starting from 2-(2-bromophenyl)imidazo[1,2-a]pyridines, alkynes, and sodium azide. This novel method involves a one-pot bimetallic relay-catalyzed cascade process combining azide–alkyne cycloaddition, C–N coupling between 1,2,3-triazole and aryl bromide, and intramolecular cross dehydrogenative C–C coupling between 1,2,3-triazole and imidazo[1,2-a]pyridine. Notable
在本文中,我们报道了1,2,3-三唑/喹啉稠合咪唑并的有效一锅合成[1,2一]从2-吡啶(2-溴苯基)咪唑并[1,2一]吡啶,炔烃和叠氮化钠。这种新方法涉及一锅双金属中继催化的级联过程,该过程结合了叠氮化物-炔烃的环加成反应,1,2,3-三唑与芳基溴化物之间的C–N偶联以及1,2,3之间的分子内交叉脱氢C–C偶联-三唑和咪唑并[1,2- a ]吡啶。该协议的显着特征包括简单的起始原料,可持续的氧化剂,减少的合成步骤和高效率。