Hypervalent iodine mediated selective synthesis of imidazo[1,2-a]pyridine ethers using ethylene glycol as a methoxy ethanol source as well as solvent under metal-free conditions is described. The method is also applicable to other fused heterocycles such as benzo[d]imidazo[2,1-b]thiazoles, 2-(thiophen-2-yl)benzo[d]imidazo [2,1-b]thiazole and indazole. Control experiments suggest that, when the C-3
描述了在无金属条件下使用乙二醇作为甲氧基乙醇源以及溶剂的高价碘介导的咪唑并[1,2- a ]吡啶醚的选择性合成。该方法还适用于其他稠合杂环,例如苯并[ d ]咪唑并[ 2,1- b ]噻唑,2-(噻吩-2-基)苯并[ d ]咪唑并[ 2,1- b ]噻唑和吲唑。对照实验表明,当咪唑并[1,2- a ]吡啶的C-3位被封闭时,该反应不会在显示本方案区域选择性的任何其他位置发生。
Synthesis of 2-Aryl-3-(arylselanyl)imidazo[1,2-a]pyridines: Copper-Catalyzed One-Pot, Two-Step Se-Arylation of Selenium with Imidazopyridines and Triarylbismuthanes
donors containing elements such as boron, silicon, tin, and iodine. A simple and general method for the synthesis of 2-aryl-3-(arylselanyl)imidazo[1,2-a]pyridines is described. A one-pot, two-step reaction between triarylbismuthanes and diimidazopyridyl diselenides, generated from imidazo[1,2-a]pyridines and Se powder in the presence of CuI and 1,10-phenanthroline, affords 3-selanylimidazopyridines in moderate
摘要 描述了一种简单且通用的合成2-芳基-3-(芳基硒基)咪唑并[1,2- a ]吡啶的方法。在CuI和1,10-菲咯啉的存在下,由咪唑并[1,2- a ]吡啶和Se粉末生成的三芳基双muthanes与二咪唑并吡啶基二硒化物之间的一锅两步反应,可提供中等收率至优异收率的3-selanylimidazopyridines。在有氧条件下。反应有效地进行,并且铋上的硒和所有芳基转移到偶联产物上。与其他含有硼,硅,锡和碘等元素的芳基供体相比,三芳基双muthanes可获得更好的结果。 描述了一种简单且通用的合成2-芳基-3-(芳基硒基)咪唑并[1,2- a ]吡啶的方法。在CuI和1,10-菲咯啉的存在下,由咪唑并[1,2- a ]吡啶和Se粉末生成的三芳基双muthanes与二咪唑并吡啶基二硒化物之间的一锅两步反应,可提供中等收率至优异收率的3-selanylimidazopyridines。在
Electrochemical sulfonylation of imidazoheterocycles under batch and continuous flow conditions
protocol for the C–H sulfonylation of imidazoheterocycles via electrochemical activation was established under batch and flow conditions. The selective C–Hbondfunctionalization proceeded under catalyst- and oxidant-free conditions and tolerated a wide range of functional groups. Various sodium sulfinates as well as imidazo[1,2-a]-pyridines, -pyrimidine, -quinolines, and -isoquinolines, imidazo[1,2-b]pyridazine
在分批和流动条件下,建立了一种通过电化学活化对咪唑杂环进行 C-H 磺酰化的有效且通用的方案。选择性 C-H 键官能化在无催化剂和无氧化剂条件下进行,并耐受多种官能团。各种亚磺酸钠以及咪唑并[1,2- a ]-吡啶、-嘧啶、-喹啉和-异喹啉、咪唑并[1,2- b ]哒嗪、咪唑[2,1- b ]噻唑和苯并[ d ]咪唑并[1,2- b ]噻唑反应成功。有趣的是,在微流体条件下获得了显着的加速和更高的产量。
Visible-light-promoted direct C3-trifluoromethylation and perfluoroalkylation of imidazopyridines
作者:Meichen Li、Gaolin Li、Chenxun Dai、Wenjun Zhou、Wenqiang Zhan、Muyang Gao、Yuan Rong、Ze Tan、Wei Deng
DOI:10.1039/d1ob01417j
日期:——
efficient method for direct trifluoromethylation and perfluoroalkylation at C3 of imidazopyridines through visible light-promoted C–H bond functionalization was developed. Under the irradiation of a blue LED, a series of C3-perfluoroalkyl-substituted imidazopyridines were synthesized from the corresponding imidazopyridines and perfluoroalkyl iodides in moderate to good yields at room temperature. It should
开发了一种通过可见光促进的 C-H 键官能化在咪唑并吡啶 C3 处直接三氟甲基化和全氟烷基化的有效方法。在蓝色 LED 的照射下,由相应的咪唑并吡啶和全氟烷基碘化物在室温下以中等至良好的产率合成了一系列 C3-全氟烷基取代的咪唑并吡啶。应该提到的是,该反应是在没有任何过渡金属催化剂、氧化剂和光催化剂的情况下进行的。
Annulation of imidazo[1,2-<i>a</i>]pyridines under metal-free conditions
A base promoted protocol for the synthesis of benzo[a]imidazo[5,1,2-cd]indolizines from 2-arylimidazo[1,2-a]pyridines and benzyne precursors under metal-free conditions has been developed. Without a transition metal, double C(sp2)–H activation of 2-phenylimidazo[1,2-a]pyridines under basic conditions was achieved. This method is also applicable for the annulation of imidazo[1,2-a]pyrimidine and naphthylamine
已开发了在无金属条件下由2-芳基咪唑[1,2- a ]吡啶和苯炔前体合成苯并[ a ]咪唑并[5,1,2- cd ]吲哚嗪的基础促进方案。没有过渡金属,双C(SP 2)- H 2苯基咪唑的活化[1,2一]在碱性条件下的吡啶达到了。该方法也适用于在相同条件下咪唑并[1,2- a ]嘧啶和萘胺的环化反应。这些环状分子表现出荧光特性,因此评价了它们的光物理性质。