已经开发了功能化2-氯-3-硝基咪唑并[1,2- a ]吡啶的替代策略。Suzuki-Miyaura交叉偶联反应可轻松提供相应的2-芳基化化合物,并由此将硝基还原为胺,从而在3位提供酰胺,苯胺和脲。据报道,使用金属催化的反应使关键化合物胺化。这项研究强调了硝基基团促进氯置换的重要性。其他亲核芳族取代为从咪唑并[1,2- a ]吡啶衍生的各种产物开辟了一条途径。
Magnetic carbon nanotube supported Cu (CoFe2O4/CNT-Cu) catalyst: A sustainable catalyst for the synthesis of 3-nitro-2-arylimidazo[1,2-a]pyridines
作者:Mo Zhang、Jun Lu、Jia-Nan Zhang、Zhan-Hui Zhang
DOI:10.1016/j.catcom.2016.02.004
日期:2016.3
A magnetic carbon nanotube supported Cu catalyst (CoFe2O4/CNT-Cu) was prepared, characterized and evaluated as a recoverable catalyst for synthesis of 3-nitro-2-arylimidazo[1,2-a]pyridines via one-potthree-component reactions of 2-aminopyridines, aldehydes and nitromethane. The reactions proceeded in PEG 400 under aerobic conditions and the products were obtained in good to excellent yields. The catalyst
制备了磁性碳纳米管负载的Cu催化剂(CoFe 2 O 4 / CNT-Cu),表征并评价为可回收的催化剂,可通过一锅三步合成3-硝基-2-芳基咪唑并[1,2- a ]吡啶。 -2-氨基吡啶,醛和硝基甲烷的-组分反应。反应在有氧条件下在PEG 400中进行,并以良好至极好的收率获得产物。该催化剂可以成功地循环使用八次,而不会明显丧失其活性。
Cu(I)-Catalyzed Synthesis of Imidazo[1,2-<i>a</i>]pyridines from Aminopyridines and Nitroolefins Using Air as the Oxidant
A copper-catalyzed method for the synthesis of imidazo[1,2-a]pyridines with aminopyridines and nitroolefins using air as oxidation agent in a one-pot procedure has been developed. In this process, the reaction appears to be very general and suitable for construction of a variety of imidazo[1,2-a]pyridines.
开发了一种铜催化的一锅法,以空气为氧化剂,与氨基吡啶和硝基烯烃合成咪唑并[1,2- a ]吡啶。在此过程中,反应似乎非常普遍,适合于构建各种咪唑并[1,2- a ]吡啶。
Bu4NI-Catalyzed Synthesis of Imidazo[1,2-a]pyridines via Oxidative Coupling of Aminopyridines with Nitroolefins
A metal-free method for the synthesis of imidazo[1,2-a]pyridines via double C–N oxidativecoupling of aminopyridines with nitroolefins using TBAI as the catalyst and TBHP as oxidation agent has been developed.
Metal-free synthesis of imidazopyridine from nitroalkene and 2-aminopyridine in the presence of a catalytic amount of iodine and aqueous hydrogen peroxide
We have developed a metal-free synthetic method for 3-nitroimidazo[1,2-a]pyridines from nitroalkenes and 2-aminopyridines using catalytic amounts of iodine and aqueous hydrogen peroxide as a terminal oxidant.
Metal-free oxidative coupling of aminopyridines with nitroolefins to imidazo[1,2-<i>a</i>]pyridine in the presence of I<sub>2</sub><b>–</b>TBHP<b>–</b>pyridine
A facile metal-free approach to the synthesis of imidazo[1,2-a]pyridine was developed through a tandem reaction of Michael addition and oxidative coupling. Iodine–t-butyl hydroperoxide–pyridine was found to be a green and efficient catalytic system for this approach.