Toward versatile methods leading to highly functionalized imidazo[1,2-a]pyridines
摘要:
A convenient and general method of preparation of polyfunctionalized imidazo[1,2-a]pyridines is reported. This methodology involves activation of secondary amides leading to the formation of the corresponding amidines 9. Different activating reagents have been evaluated and the efficiency of PCl5 was illustrated with alkyl functionalized groups. (C) 2012 Elsevier Ltd. All rights reserved.
Copper(II)-Catalyzed Aerobic Oxidative Coupling between Chalcone and 2-Aminopyridine<i>via</i>CH Amination: An Expedient Synthesis of 3-Aroylimidazo[1,2-<i>a</i>]pyridines
A simple and efficient protocol has been developed for the synthesis of 3‐aroylimidazopyridines via copper(II) acetate‐catalyzed aerobic oxidative amination. A library of 3‐aroylimidazopyridines was synthesized from readily accessible chalcones and 2‐aminopyridines with high yields and regioselectivity. The reaction proceeds through a tandemMichael addition followed by an intramolecular oxidative
Superparamagnetic nanoparticle-catalyzed coupling of 2-amino pyridines/pyrimidines with <i>trans</i>-chalcones
作者:Oanh T. K. Nguyen、Pha T. Ha、Ha V. Dang、Yen H. Vo、Tung T. Nguyen、Nhan T. H. Le、Nam T. S. Phan
DOI:10.1039/c9ra00097f
日期:——
An aerobic coupling of 2-aminopyrimidines or 2-aminopyridines with trans-chalcones to afford aroylimidazo[1,2-a]pyrimidines and aroylimidazo[1,2-a]pyridines is reported. Reactions proceed in the presence of CuFe2O4 superparamagnetic nanoparticle catalyst, two equivalents of iodine, oxygen oxidant, and 1,4-dioxane solvent. The catalyst is superior to many common copper or iron complexes. Copper ferrite
报道了 2-氨基嘧啶或 2-氨基吡啶与反式查耳酮的需氧偶联,得到芳酰基咪唑并[1,2 - a ]嘧啶和芳酰基咪唑并[1,2- a ]吡啶。反应在 CuFe 2 O 4超顺磁性纳米颗粒催化剂、两当量碘、氧氧化剂和 1,4-二恶烷溶剂的存在下进行。该催化剂优于许多常见的铜或铁络合物。铁氧体铜可以很容易地通过磁倾析分离并重复使用多达 5 次而不会造成重大的活性损失。这里描述的方法标志着使用简单的非均相催化剂合成稠合杂环的罕见例子。据我们所知,芳酰咪唑[1,2- a]嘧啶和芳酰咪唑并[1,2- a ]吡啶以前没有使用该协议合成。
Copper supported on H<sup>+</sup>-modified manganese oxide octahedral molecular sieves (Cu/H-OMS-2) as a heterogeneous biomimetic catalyst for the synthesis of imidazo[1,2-a]-N-heterocycles
A facilesynthesis of 3-aroylimidazo[1,2-a]pyridine derivatives has been achieved through the one-pot, three-component tandem reaction of acetophenones, arylaldehydes and 2-aminopyridines in the presence of a catalytic amount of copper(II) chloride and air as the sole oxidant. The developed one-pot method is atom-economical and utilizes readily available precursors to offer highly functionalized N-fused
Toward versatile methods leading to highly functionalized imidazo[1,2-a]pyridines
作者:Alexandra Basilio-Lopes、Thiago Mendonça de Aquino、Alexandre Mongeot、Jean-Jacques Bourguignon、Martine Schmitt
DOI:10.1016/j.tetlet.2012.02.117
日期:2012.5
A convenient and general method of preparation of polyfunctionalized imidazo[1,2-a]pyridines is reported. This methodology involves activation of secondary amides leading to the formation of the corresponding amidines 9. Different activating reagents have been evaluated and the efficiency of PCl5 was illustrated with alkyl functionalized groups. (C) 2012 Elsevier Ltd. All rights reserved.