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。
Synthesis of Polysubstituted Imidazo[1,2-<i>a</i>]pyridines via Microwave-Assisted One-Pot Cyclization/Suzuki Coupling/Palladium-Catalyzed Heteroarylation
作者:Jamal Koubachi、Saïd El Kazzouli、Sabine Berteina-Raboin、Abderrahim Mouaddib、Gérald Guillaumet
DOI:10.1021/jo0712603
日期:2007.9.1
A new and efficient method for the synthesis of 2,3,6-trisubstituted imidazo[1,2-a]pyridine derivatives using a microwave-assistedone-pot, two-step Suzuki/heteroarylation or one-pot, three-step cyclization/Suzuki/heteroarylation was developed. Polysubstituted compounds are obtained in good yield from 2-amino-5-halogenopyridines, 2-halogenocarbonyl derivatives, boronic acids, and heteroaryl bromides
一种新的,高效的微波辅助一锅两步铃木/杂芳基化或一锅三步环化合成2,3,6-三取代的咪唑并[1,2- a ]吡啶衍生物的方法开发了/ Suzuki /杂芳基化。从2-氨基-5-卤代吡啶,2-卤代羰基衍生物,硼酸和杂芳基溴化物以高收率获得多取代的化合物。
Electrochemically initiated intermolecular C–N formation/cyclization of ketones with 2-aminopyridines: an efficient method for the synthesis of imidazo[1,2-<i>a</i>]pyridines
Electrochemical intermolecular C–N formation/cyclization of ketones with 2-aminopyridines using catalytic hydriodic acid as the redox mediator was developed, providing imidazo[1,2-a]pyridines under more environmentally benign conditions. The reaction proceeds in a simple undivided cell, using low toxic ethanol as the solvent, without external oxidants, and exhibits high atom economy. A variety of ketones
开发了使用催化氢碘酸作为氧化还原介体的2-氨基吡啶与酮的电化学分子间C–N形成/环化反应,在更环境友好的条件下提供了咪唑并[1,2- a ]吡啶。该反应在一个简单的,没有分裂的细胞中进行,使用低毒的乙醇作为溶剂,没有外部氧化剂,并且具有很高的原子经济性。该反应适合各种酮,包括苯乙酮,未取代的和烷基酮,以中等至极好的收率提供相应的产物。在标准条件下,也可以实现三组分串联反应,实现C–N,C–S / C–Se键的形成。
Copper-catalyzed three-component reaction of imidazo[1,2-a]pyridine with elemental sulfur and arylboronic acid to produce sulfenylimidazo[1,2-a]pyridines
Abstract In this work, an efficient copper-catalyzedthree-componentreaction for the synthesis of sulfenylimidazo[1,2-a]pyridines using elemental sulfur as the sulfenylating agents has been developed. The reaction could proceed smoothly with a high degree of functional group tolerance and provide the desired products in moderate to good yield.