Copper-catalyzed oxidative multicomponent reaction: synthesis of imidazo fused heterocycles with molecular oxygen
作者:Xianwei Li、Tianzhang Wang、Yu-Jing Lu、Shaomin Ji、Yanping Huo、Bifu Liu
DOI:10.1039/c8ob01532e
日期:——
An oxidative cascade that involves multicomponent reaction comprising a terminal alkyne, 2-amino N-heterocycle, benzyl or allylic bromide with molecularoxygen, delivering densely functionalized imidazo fused heterocycles, is described. This reaction features a cheap catalyst, a green oxidant, and readily available starting materials, which make the overall synthesis applicable in the quick access
An efficient and mild synthesis of imidazo[1,2-a]pyrimidine derivatives has been developed from readily available pyrimidyl arylamines or enamines through a hypervalent iodine-promoted intramolecular C–H bond cycloamination reaction. This protocol allows for the facile construction of biologically active bicyclic imidazo[1,2-a]pyrimidine skeletons as well as other imidazo[1,2-a]-type fused heterocycles
Iodine-promoted oxidative coupling reaction: a simple and efficient process to access imidazo[1,2-a]pyridines from 2-aminopyridines and chalcones
作者:Meng-Ming Xing、Ming Xin、Chao Shen、Jian-Rong Gao、Jian-Hong Jia、Yu-Jin Li
DOI:10.1016/j.tet.2016.05.052
日期:2016.7
A unique and efficient approach has been developed for the synthesis of substituted imidazo[1,2-a]pyridines with aminopyridines and chalcones via a one-pot I2-induced aerobic oxidative coupling. The reported reaction proceeded though a tandem Michael addition followed by an intramolecular oxidative amination with high regioselectivity, yields and good functional group tolerance.
已经开发了一种独特且有效的方法,用于通过一锅I 2诱导的需氧氧化偶联合成具有氨基吡啶和查耳酮的取代的咪唑并[1,2- a ]吡啶。报道的反应是通过串联迈克尔加成反应进行的,然后进行分子内氧化胺化,具有较高的区域选择性,产率和良好的官能团耐受性。
Synthesis of 3-aroylimidazo[1,2-a]pyridines via CuCl2 catalyzed tandem dual carbon–nitrogen bonding
A novel tandem approach has been demonstrated for the direct synthesis of bioactive 3-aroylimidazo[1,2-a]pyridines from chalcones and 2-aminopyridines. The reported tandem reaction is atom-economical and expected to proceed via 1,4-Michael addition followed by coppercatalyzed oxidative C–N bonding. Catalytic amount of copper was found to be crucial for the success of tandem reaction and it altered
已经证明了一种新颖的串联方法,用于从查耳酮和2-氨基吡啶直接合成生物活性的3-芳基咪唑并[1,2- a ]吡啶。报道的串联反应是原子经济的,预计将通过1,4-Michael加成反应,然后进行铜催化的氧化C-N键进行。发现铜的催化量对于串联反应的成功至关重要,它改变了反应途径,提供了全新的产品。该方案被证明是方便的,因为在存在空气作为氧化剂的情况下反应平稳进行而无需任何配体。
Copper catalyzed aerobic oxidative cyclization and ketonization: one pot synthesis of benzoimidazo[1,2-a]imidazolones
作者:Manikandan Selvaraju、Tzuen-Yang Ye、Chia-Hsin Li、Pei-Heng Ho、Chung-Ming Sun
DOI:10.1039/c6cc01828a
日期:——
A highly efficientsynthesis of benzoimidazo[1,2-a]imidazolone through a novel oxidative 5-exo-dig cyclization-ketonization cascade of 2-aminobenzimidazole, aldehyde and terminalalkyne has been explored underaerobicconditions.
在有氧条件下,通过2-氨基苯并咪唑,醛和末端炔的新型5 - exo -dig环化-酮化级联反应,高效合成了苯并咪唑并[1,2- a ]咪唑酮。