从容易获得的咪唑并[1,2- a ]吡啶和叠氮化钠开始合成4 H-吡啶并[1,2- a ] [1,3,5]三嗪-4-的快速简便的方法在有氧氧化条件下出现。反应进行得很好,促进了过硫酸钾/高锰酸钾的吸收,并且具有良好的官能团耐受性。通过这种方法组装了多种具有生物学价值的4 H-吡啶并[1,2- a ] [1,3,5]三嗪-4-1支架。也实现了克级反应。反应中可能涉及级联的硝化和氧化再循环序列。
imidazo[1,2-a]pyridines using p-tosylchloride as a benign source of sulfenylating agents has been developed. On the other hand, p-tosylchloride mediated thiomethylation of imidazo[1,2-a]pyridines with dimethylsulfoxide as a source of thiomethylation under metal-free conditions was also described.
已经开发了使用对甲苯磺酰氯作为亚磺化剂的良性来源的咪唑并[1,2- a ]吡啶的铜催化的区域选择性C-3亚磺酰基化。另一方面,还描述了在无金属条件下,对甲苯磺酰氯介导的咪唑并[1,2- a ]吡啶的硫甲基化,其中使用二甲基亚砜作为硫甲基化的来源。
Hypervalent iodine mediated synthesis of imidazo[1,2-<i>a</i>]pyridine ethers: consecutive methylene linkage and insertion of ethylene glycol
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。
Metal-free, Tf2NH-catalyzed 1, 6-conjugate addition of imidazopyridine to para-quinone methides: Easy access to C3-functionalized triarylmethane imidazopyridine
作者:Nilesh S. Khonde、Madhukar S. Said、Jagjivan K. Sabane、Jayant M. Gajbhiye、Pradeep Kumar
DOI:10.1016/j.tet.2021.132510
日期:2021.11
An inexpensive and commercially available Tf2NH-catalyzed 1,6-conjugate addition of imidazopyridine (IMPY) heterocycles to para-quinone methides (p-QMs) is reported. The present transformation provides a diverse class of C3-functionalized triarylmethanes heterocyclic derivatives of imidazopyridine. These metal-free transformations provided a very broad substrate scope of conjugate addition product
Iodine–triphenylphosphine mediated sulfenylation of imidazoheterocycles with sodium sulfinates
作者:Xuhu Huang、Shucheng Wang、Bowen Li、Xin Wang、Zemei Ge、Runtao Li
DOI:10.1039/c4ra17237j
日期:——
An efficient approach to sulfenyl imidazoheterocycles has been developed via iodine–triphenylphosphine mediated direct sulfenylation of imidazoheterocycles with sodiumsulfinates. The reactions proceed smoothly under transition-metal-free conditions with a broad range of substrate scope, giving the desired products in moderate to excellent yields.