Efficient One Pot Synthesis of Phenylimidazo[1,2‐
<i>a</i>
]pyridine Derivatives using Multifunctional Copper Catalyst Supported on β‐Cyclodextrin Functionalized Magnetic Graphene oxide
the synthesis of N‐(alkyl)‐2‐phenylimidazo[1,2‐a]pyridin‐3‐amine derivatives based on coppercatalyzedoxidative cyclization is presented. An efficient copper nanocatalyst was fabricated by immobilization of Cu on β‐Cyclodextrin (βCD) functionalized magnetic graphene oxide nanosheets (denoted as Cu@βCD@MGO). This catalyst primarily oxidizes benzylic alcohols to aldehydes by aerobic O2. The obtained
在本文中,一种基于铜催化氧化环化合成N-(烷基)-2-苯基咪唑并[1,2 - a ]吡啶-3-胺衍生物的新颖,“绿色”,高效且原子经济的方法是呈现。通过将铜固定在β-环糊精(βCD )功能化的磁性氧化石墨烯纳米片(表示为Cu @βCD@ MGO)上,制得了高效的铜纳米催化剂。该催化剂主要通过好氧O 2将苄醇氧化为醛。所获得的醛原位参与与吡啶-2-胺和异氰酸酯的三组分反应,生成相应的N-(烷基)-2-苯基咪唑[1,2- a]]吡啶-3-胺衍生物。通过TEM,SEM,VSM,FT-IR,XRD,TGA和ICP对催化剂进行了表征。作为优点,该催化剂显示出高度可回收的,并且在十次运行后未观察到明显的浸出。
Efficient Synthesis of 3-Aminoimidazo[1,2-a] Pyridines Using Silica-Supported Perchloric Acid (HClO4-SiO2) as a Novel Heterogenous Catalyst
作者:Azizollah Habibi、Zahra Tarameshloo、Shahnaz Rostamizadeh、Ali M. Amani
DOI:10.2174/157017812800167439
日期:2012.3.1
An efficient and green protocol for synthesis of 3-aminoimidazo[1,2-a] pyridine derivatives through a three-component reaction of aldehyde, 2-amino pyridine and isocyanide in the presence of silica-supportedperchloricacid (HClO4-SiO2) is described in this paper. The solid catalyst could be recycled and reused.
In this study, first biocatalytic synthesis of clinically important imidazo[1,2- a]pyridine based compounds has been achieved. The Candida antarctica lipase B (CALB) enzyme was found suitable to catalyze the Groebke-Blackburn-Bienaymé (GBB) multicomponent reaction of substituted 2-aminopyridine, benzaldehyde and isocyanides to synthesize imidazo[1,2-a]pyridine derivatives in very good yields. Further
A new electrostatically enhanced sulfuric acid as a strong Brønstedacidiccatalyst has been developed for multi-component reactions. A positively charged center in the catalyst electrostatically activates it for acid-catalyzed multi-component reactions and afforded desired products in short reaction time and near room temperature in EtOH as a green solvent.Graphical Abstract
synthesis of quaternary α-aminosuccinimides in toluene medium involving 2-phenylimidazo[1, 2-a]pyridine in a one-pot reaction promoted by FerricNitrate at 120 °C. The protocol presented herein, is for the first time, via a novel transformation where FerricNitrate promotes imidazo[1,2-a]pyridine structural metamorphosis to the title compound quaternary succinimides. High compatibility, easy work-up