An iron(III)-catalyzed one-potthree-component cross-coupling nitration reaction of 2-aminopyridines, aldehydes and nitroalkanes, straightforwardly forms imidazo[1,2-a]pyridinederivatives and is described in this report. The system shows good functional-group tolerance and proceeds smoothly in moderate to good yields.
Copper(I) Iodide/Boron Trifluoride Etherate-Cocatalyzed Aerobic Dehydrogenative Reactions Applied in the Synthesis of Substituted Heteroaromatic Imidazo[1,2-<i>a</i>]pyridines
作者:Zhong-Jian Cai、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1002/adsc.201300333
日期:2013.9.16
dehydrogenation coupling reactions, similar transforms initiated by copper/oxygen have attracted more and more attention. We have investigated a novel construction of heteroaromatic imidazo[1,2‐a]pyridines through copper(I) iodide/boron trifluoride etherate/oxygen‐mediated dehydrogenative reactions of aryl alkyl or alkyl alkyl ketones with 2‐aminopyridines. Four hydrogen atoms are removed and two new CN bonds
与众所周知的钯催化的氧化脱氢偶联反应相比,由铜/氧引发的类似转化越来越受到关注。我们研究了通过芳基烷基或烷基烷基酮与2-氨基吡啶的碘化亚铜(I)/三氟化硼醚化物/氧介导的脱氢反应,研究杂芳族咪唑并[1,2- a ]吡啶的新型结构。通过亚胺的形成和氧化性C(sp 3)H官能化一步除去四个氢原子并形成两个新的CN键。
One-Pot Synthesis of 3-Methyl-2-arylimidazo[1,2-<i>a</i>]pyridines Using Calcium Carbide as an Alkyne Source
作者:Wei Chen、Zheng Li
DOI:10.1021/acs.joc.1c01877
日期:2022.1.7
An efficient method for the construction of 3-methyl-2-arylimidazo[1,2-a]pyridines from the reactions of calcium carbide, 2-aminopyridines, and aromatic aldehydes is described. The notable advantages for this strategy include the use of an inexpensive and concise solid alkyne source, cheap and readily available raw materials, wide-scope substrates, and a simple work-up procedure.
描述了一种由电石、2-氨基吡啶和芳香醛反应构建 3-甲基-2-芳基咪唑并[1,2- a ] 吡啶的有效方法。该策略的显着优势包括使用廉价且简洁的固体炔烃源、廉价且容易获得的原材料、广泛的底物和简单的后处理程序。
Copper-Catalyzed Synthesis of Imidazo[1,2-<i>a</i>]pyridines through Tandem Imine Formation-Oxidative Cyclization under Ambient Air: One-Step Synthesis of Zolimidine on a Gram-Scale
A new copper‐catalyzed oxidative cyclization via CH amination between 2‐aminopyridines and methyl aryl/heteroaryl ketones has been developed under ambient air. Imidazo[1,2‐a]pyridines containing a wide range of functional groups have been synthesized from basic and easily available starting materials. This simple, one‐pot reaction protocol is applicable for the direct preparation of zolimidine (a
一种新的铜催化的氧化环化经由Ç ħ胺化2-氨基吡啶和间甲基芳基/杂芳基酮已根据环境空气显影。含有多种官能团的咪唑并[1,2- a ]吡啶是从碱性且容易获得的起始原料合成的。这种简单的一锅法反应方案适用于大规模直接制备唑来咪定(市售的抗溃疡药)。