Synthesis of organosilyl compounds-containing 1,2,4,5-tetraaryl imidazoles sonocatalyzed by M/SAPO-34 (M = Fe, Co, Mn, and Cu) nanostructures
作者:Kazem D. Safa、Maryam Allahvirdinesbat、Hassan Namazi、Parvaneh Nakhostin Panahi
DOI:10.1016/j.crci.2015.04.008
日期:2015.8
Résumé The one-step synthesis of silylated 1,2,4,5-tetraaryl imidazoles by use of a series of M/SAPO-34 (M: Fe, Co, Mn, and Cu) nanocatalysts and subsequent silylation reactions is described. Cu/SAPO-34 catalyst has the highest activity in improving the efficiency of the heterogeneous cyclo-condensation of an aldehyde, benzil, ammonium acetate and a primary aromatic amine in water under ultrasonic irradiation. Some of imidazole derivatives are studied with a view to the synthesis of a series of new, multi-substituted imidazoles containing organosilyl groups including carbosilanes (Si–C) and silyl ethers (Si–O). Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.docx
An Effective and New Method for the Synthesis of Polysubstituted Imidazoles by the Use of CrCl<sub>3</sub>.6H<sub>2</sub>O as a Green and Reusable Catalyst: Synthasis of Some Novel Imidazole Derivatives
environmentally adapted synthesis of polysubstituted imidazoles in one‐pot is found. The multicomponent reaction of various aldehydes, benzil, aliphatic and aromatic primary amines and ammonium acetate under solvent‐free condition is explained. The highly efficient role of CrCl3.6H2O as catalyst in this synthesis was shown. By this advantage, several polysubstituted imidazoles as pharmaceutical important
An efficient and one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles catalyzed by InCl3·3H2O
作者:Saikat Das Sharma、Parasa Hazarika、Dilip Konwar
DOI:10.1016/j.tetlet.2008.02.053
日期:2008.3
InCl3·3H2O was found to be a mild and effective catalyst for the efficient, one-pot, three component synthesis of 2,4,5-trisubstituted imidazoles at room temperature. Moreover, the utility of this protocol was further explored conveniently for the one-pot, four component synthesis of 1,2,4,5-tetrasubstitutedimidazoles in high yields.
Multicomponent, one-pot, highly efficient, and environmentally adapted synthesis of some novel polysubstituted imidazoles by the use of various aldehydes, benzil, aliphatic, and aromatic primary amines and ammonium acetate in the presence of Fe_3O_4 nanoparticles as catalyst under solvent-free condition is explained. A highly efficient role of Fe_3O_4 nanoparticles as catalyst in this synthesis was shown. By this advantage, several polysubstituted imidazoles as pharmaceutical important molecules can be prepared in high yield and high purity. This method is very easy and rapid for the synthesis of imidazole derivatives. All products were deduced from their IR and NMR spectroscopic data. The Fe_3O_4 nanoparticles were characterized by powdered X-ray diffraction (XRD), transmission electron microscopy (TEM), and FT-IR spectroscopy.
New Conditions for the Effective Synthesis of Tri and Tetrasubstituted Imidazoles Catalysed by Recyclable Indium (III) Triflate and Magnesium Sulfate Heptahydrate
aromatic primary amines and ammonium acetate is reported for the synthesis of tri/tetra-substituted imidazoles under solvent-free conditions. Indium (III) trifluoromethanesulfonate and magnesiumsulfateheptahydrate as two highly efficient and recyclable catalysts perform a key factor to synthesis of imidazole derivatives with high yields.