Copper-Catalyzed Aerobic Oxidative Cyclization of Ketoxime Acetates with Pyridines for the Synthesis of Imidazo[1,2-a]pyridines
作者:Zhi-Hui Ren、Zheng-Hui Guan、Mi-Na Zhao、Yukun Yi、Yao-Yu Wang
DOI:10.1055/s-0035-1561950
日期:——
copper(I)-catalyzed aerobic oxidative coupling of ketoximeacetates with simple pyridines for the synthesis of imidazo[1,2-a]pyridines has been developed. This reaction tolerates a wide range of functional groups and it affords a series of valuable imidazo[1,2-a]pyridines in high yields under mild conditions. A copper(I)-catalyzed aerobic oxidative coupling of ketoximeacetates with simple pyridines for the synthesis
摘要 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。 已开发出铜(I)催化的酮肟肟乙酸酯与简单的吡啶的好氧氧化偶联,用于合成咪唑并[1,2- a ]吡啶。该反应可耐受各种官能团,并且在温和条件下以高收率提供了一系列有价值的咪唑并[1,2- a ]吡啶。
Peroxide-mediated site-specific C–H methylation of imidazo[1,2-<i>a</i>]pyridines and quinoxalin-2(1<i>H</i>)-ones under metal-free conditions
作者:Shengzhou Jin、Hua Yao、Sen Lin、Xiaoqing You、Yao Yang、Zhaohua Yan
DOI:10.1039/c9ob02328c
日期:——
An effective approach to realize the direct methylation of imidazo[1,2-a]pyridines and quinoxalin-2(1H)-ones with peroxides under metal-free conditions is described.
<i>S</i>-Aryl Arenesulfonothioate and Copper Acetate Mediated Arylthiolation of 2-Arylpyridines and Heteroarenes
作者:Poonam Sharma、Nidhi Jain
DOI:10.1021/acs.joc.9b01954
日期:2019.10.18
Copperacetate mediated regioselective ortho-arylthiolation of 2-arylpyridines has been accomplished for the first time using S-aryl arenesulfonothioate as the arylthiolating agent. The reaction shows good functional group tolerance and gives thioarylated products in 67-89% yields. This reagent is a good alternative to unpleasant smelling arylthiols. Experimental evidence suggests an unprecedented
Metal-Free Site-Specific Hydroxyalkylation of Imidazo[1,2-<i>a</i>]pyridines with Alcohols through Radical Reaction
作者:Shengzhou Jin、Bo Xie、Sen Lin、Cong Min、Ruihong Deng、Zhaohua Yan
DOI:10.1021/acs.orglett.9b01212
日期:2019.5.3
An effective approach to realize the direct hydroxyalkylation of imidazo[1,2-a]pyridines with alcohols promoted by di-tert-butyl peroxide was described without any metal catalyst. It is the first time that the dehydrogenative C(sp3)–C(sp2) coupling of imidazo[1,2-a]pyridines with alcohols occurred regioselectively at the C-5 position of imidazo[1,2-a]pyridines. Multisubstituted imidazopyridine derivatives
描述了一种在没有任何金属催化剂的情况下用过氧化二叔丁基促进的醇实现咪唑并[1,2- a ]吡啶直接羟烷基化的有效方法。这是第一次脱氢C(SP 3)-C(SP 2)咪唑并耦合[1,2一]与醇在吡啶咪唑并[1,2的C-5位区域选择性地发生一个]吡啶。多取代的咪唑并吡啶衍生物以中等至良好的收率顺利合成。通过一系列对照实验,提出了一条自由基途径来解释该实验。