期刊
ULTRASONICS SONOCHEMISTRY
卷 20, 期 2, 页码 740-746出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2012.10.004
关键词
Fe3O4 nanoparticles; Sulfamic acid; Imidazole; Solid acid catalyst; Ultrasound irradiation
资金
- Research Council of the University of Kashan [159198/II]
Fe3O4 nanoparticles were prepared by chemical coprecipitation method and subsequently coated with 3-aminopropyltriethoxysilane (APTES) via silanization reaction. Grafting of chlorosulfuric acid on the amino-functionalized Fe3O4 nanoparticles afforded sulfamic acid-functionalized magnetic nanoparticles (SA-MNPs). SA-MNPs was found to be a mild and effective solid acid catalyst for the efficient, one-pot, three-component synthesis of 2,4,5-trisubstituted imidazoles under ultrasound irradiation. This protocol afforded corresponding imidazoles in shorter reaction durations, and in high yields. This green procedure has many obvious advantages compared to those reported in the previous literatures, including avoiding the use of harmful catalysts, easy and quick isolation of the products, excellent yields, short routine, and simplicity of the methodology. (C) 2012 Elsevier B.V. All rights reserved.
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