Zinc (II) [tetra(4-methylphenyl)] Porphyrin: a Novel and Reusable Catalyst for Efficient Synthesis of 2,4,5-trisubstituted Imidazoles Under Ultrasound Irradiation
An efficient three-component one-step synthesis of 2,4,5-trisubstituted imidazoles by condensation reaction of 1,2-diketones or α-hydroxyketones with aromatic aldehydes and ammonium acetate using Zinc (II) (tetra (4-methylphenyl)) porphyrin as a novel and reusable catalyst under ultrasound irradiation at ambient temperature is described. In this method, α-hydroxyketones as well as 1,2-diketones were
A simple highly versatile and efficient synthesis of 2,4,5-trisubstituted imidazoles is achieved by three-component cyclocondensation of 1,2-dicarbonyl compound, aldehyde and ammonium acetate using l-proline as a catalyst in methanol at moderate temperature. To explore the utility of this method 1,2,4,5-tetrasubstitutedimidazoles were also synthesized. The key advantages of this process are high yields
Room temperature ionic liquid promoted improved and rapid synthesis of highly functionalized imidazole and evaluation of their inhibitory activity against human cancer cells
作者:Chetan K. Jadhav、Amol S. Nipate、Asha V. Chate、Pratiksha M. Kamble、Ganesh A. Kadam、Vidya S. Dofe、Vijay M. Khedkar、Charansingh H. Gill
DOI:10.1002/jccs.202000468
日期:——
advantage of this protocol for gram-scale synthesis adds to its practical applicability. Selected synthesized tetra- and trisubstitutedimidazole scaffolds were screened for their in vitro antiproliferative properties against the human cancer cell lines EC-109, MCF-7, HGC-27, and PC-3. Compounds 4m, 5e, and 5v showed potent cytotoxic activity against the human breast cancer cell line PC-3, MCF-7, and HGC-27
A highly efficient magnetic solid acid catalyst for synthesis of 2,4,5-trisubstituted imidazoles under ultrasound irradiation
作者:Javad Safari、Zohre Zarnegar
DOI:10.1016/j.ultsonch.2012.10.004
日期:2013.3
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.
Tandem Oxidation Process Using Ceric Ammonium Nitrate: Three-Component Synthesis of Trisubstituted Imidazoles Under Aerobic Oxidation Conditions
作者:Ahmad Shaabani、Ali Maleki、Maryam Behnam
DOI:10.1080/00397910802369661
日期:2008.12.16
By combining a ceric ammonium nitrate (CAN)-catalyzed aerobic oxidation of alpha-hydroxy ketones with a subsequent three-component condensation reaction using aldehydes and ammonium acetate, highly substituted imidazole derivatives can be assembled. This reaction is an important approach for the synthesis of highly substituted imidazole derivatives and was carried out in good to excellent yields in ethanol as an environmentally benign solvent.