摘要开发了一种简单有效的方法,在超声辐射下合成取代的咪唑并[1,2- a ]吡啶。使用离子液体作为催化剂进行反应。该反应过程证明了乙酰苯和2-氨基吡啶的底物范围广,并提供了对各种咪唑并[1,2- a ]吡啶的便捷通道。与传统的加热方法相比,本方法具有许多优点,例如产率更高,反应时间更短,反应条件更温和以及后处理步骤更容易。 图形概要
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)。
Rh(III)-Catalyzed Tandem Bicyclization of 2-Arylimidazo[1,2-<i>a</i>]pyridines with Cyclic Enones for the Construction of Bridged Scaffolds
作者:K. Nagarjuna Reddy、D. Yogananda Chary、B. Sridhar、B. V. Subba Reddy
DOI:10.1021/acs.orglett.9b03041
日期:2019.11.1
An efficient Rh(III)-catalyzed bicyclization of 2-arylimidazo[1,2-a]pyridine with cyclic enones has been developed for the synthesis of bridged imidazopyridine derivatives in excellent yields up to 95%. The reaction proceeds through a sequential conjugate addition of ortho-C-H bond of aryl group followed by an intramolecular C3-alkylation of imidazopyridine ring in a highly regioselective manner.