Copper-Catalyzed Tandem Azide–Alkyne Cycloaddition, Ullmann Type C–N Coupling, and Intramolecular Direct Arylation
摘要:
A ligand-free copper-catalyzed tandem azide-alkyne cycloaddition (CuAAC), Ullmann-type C-N coupling, and intramolecular direct arylation has been described. The designed strategy resulted in the synthesis of a novel trazole-fused azaheterocycle framework. The reaction gave good yields (59-77%) of 1,2,3-triazole-fused imidazo[1,2-a]pyridines in a single step.
An efficient onepot, three component synthesis of C3 sulfonamidomethylated imidazopyridines has been disclosed under metal-free conditions, which utilized the commercially available and renewable reagent methanol as the main methylene source. A wide range of substituted imidazopyridines and sulfamides/amines were well tolerated to afford the corresponding products in up to 92% yield. In the isotopic
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
synthesized and their antiinflammatory activities toward NLRP3 (nucleotide-binding domain leucine-rich repeat containing protein family,pyrin domain-containing 3,also known as cryopyrin or NALP3) inflammasome were evaluated in vitro. Two lead compounds, TBZ-09 and TBZ-21, were identified by antiproduction of IL-1β. In the second round of biological evaluation, based on the lead, 34 more compounds were synthesized
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。
Copper-Catalyzed Double Thiolation To Access Sulfur-Bridged Imidazopyridines with Isothiocyanate
作者:Lu-Lu Tian、Shuai Lu、Zhe-Hua Zhang、En-Ling Huang、Hua-Ting Yan、Xinju Zhu、Xin-Qi Hao、Mao-Ping Song
DOI:10.1021/acs.joc.9b00186
日期:2019.5.3
copper(I)-catalyzed sulfur-bridged dimerization of imidazopyridines has been developed using isothiocyanate as the sulfur source. This method enables a switchable synthesis of bis(imidazo[1,2-a]pyridin-3-yl)sulfanes or bis(2-(imidazo[1,2-a]pyridin-2-yl)phenyl)sulfanes in the presence of 4-dimethylaminopyridine (DMAP) or K2CO3 when different imidazopyridines were employed. Under optimized conditions, a variety of sulfur-bridged
已开发了使用异硫氰酸酯作为硫源的咪唑并吡啶在铜(I)催化下的硫桥联二聚反应。该方法能够在存在下可切换合成双(咪唑并[1,2 - a ]吡啶-3-基)硫烷或双(2-(咪唑并[1,2 - a ]吡啶-2-基]苯基)硫烷当使用不同的咪唑并吡啶时,可以测定4-二甲基氨基吡啶(DMAP)或K 2 CO 3的含量。在优化的条件下,以高收率获得了各种硫桥联的咪唑并吡啶。此外,已证明硫脲是催化体系A下的关键中间体。