Magnetically Recyclable Ag@Fe2O3 Core-shell Nanostructured Catalyst for One-pot Synthesis of 2-Aryl Benzimidazole and Benzothiazole

IF 0.9 Q4 CHEMISTRY, PHYSICAL

Current Organocatalysis Pub Date : 2022-03-29 DOI:10.2174/2213337209666220329125047

Gayatree Shinde, Jyotsna Thakur

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引用次数: 2

Abstract

Nanocatalysts exhibit several applications in the synthesis of many industrially important organic compounds. They manifest extremely fascinating physical and chemical properties which can be exploited in their catalytic applications. A magnetically recyclable Ag@Fe2O3 core-shell structured nanocatalyst was synthesized by a simple sol-gel technique and characterized by x-ray diffraction spectroscopy, field emission scanning electron microscope, high-resolution transmission electron microscopy, fourier transform infrared spectroscopy, vibrating sample magnetometer etc. Nanocatalyst was found to be a highly efficient heterogeneous catalyst for the synthesis of 2-aryl benzimidazoles and benzothiazoles via one-pot condensation of aromatic aldehydes and 1, 2-phenylenediamine, and 2-aminothiophenol. Ag@Fe2O3 nanocatalyst provides rapid conversion of the substrate into the desired product at room temperature within just 5-18 min in the presence of C2H5OH with good to excellent yield. The combination of Ag core with magnetic Fe2O3 shell results in improved efficiency, stability, magnetic recovery, and reusability compare to the individual nanoparticles. The synthetic protocol is featured with high yield, mild conditions, and simple work-up. Magnetic recovery of the catalyst from reaction systems and its reusability for several runs without loss of catalytic activity are additional advantages.

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磁性可回收Ag@Fe2O3一锅合成2-芳基苯并咪唑和苯并噻唑的核壳纳米结构催化剂

纳米催化剂在许多工业上重要的有机化合物的合成中有多种应用。它们表现出非常迷人的物理和化学性质，可以在催化应用中加以利用。采用简单的溶胶-凝胶法合成了一种磁性可回收的Ag@Fe2O3核壳结构纳米催化剂，并通过x射线衍射光谱、场发射扫描电镜、高分辨率透射电镜、傅里叶变换红外光谱、振动样品磁强计等手段对其进行了表征。研究发现，纳米催化剂是芳香醛与1,2 -苯二胺和2-氨基噻吩一锅缩合合成2-芳基苯并咪唑和苯并噻唑的高效非均相催化剂。Ag@Fe2O3纳米催化剂在室温下，在C2H5OH的存在下，仅需5-18分钟即可将底物快速转化为所需的产物，收率很高。与单个纳米颗粒相比，银芯与磁性Fe2O3壳的结合提高了效率、稳定性、磁性回收率和可重用性。该合成工艺具有收率高、条件温和、工序简单等特点。催化剂的磁性回收反应体系和它的可重复使用的几次运行而不损失催化活性是额外的优势。

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来源期刊

Current Organocatalysis CHEMISTRY, PHYSICAL-

CiteScore

2.00

自引率

0.00%

发文量

期刊介绍： Current Organocatalysis is an international peer-reviewed journal that publishes significant research in all areas of organocatalysis. The journal covers organo homogeneous/heterogeneous catalysis, innovative mechanistic studies and kinetics of organocatalytic processes focusing on practical, theoretical and computational aspects. It also includes potential applications of organocatalysts in the fields of drug discovery, synthesis of novel molecules, synthetic method development, green chemistry and chemoenzymatic reactions. This journal also accepts papers on methods, reagents, and mechanism of a synthetic process and technology pertaining to chemistry. Moreover, this journal features full-length/mini review articles within organocatalysis and synthetic chemistry. It is the premier source of organocatalysis and synthetic methods related information for chemists, biologists and engineers pursuing research in industry and academia.