Synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted-1H-imidazole derivatives and or 2,4,5-Triaryloxazoles using of Silica-Supported Preyssler Nanoparticles (original) (raw)
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Chinese Journal of Chemistry, 2011
Phosphorus pentoxide supported on silica gel (P 2 O 5 /SiO 2 ) has been used as an efficient and reusable catalyst for the one-pot pseudo four-component synthesis of 2,4,5-trisubstituted imidazoles from benzil or benzoin, aldehydes, and ammonium acetate. It was also used for four-component preparation of 1,2,4,5-tetrasubstituted imidazoles from benzil or benzoin, aldehydes, primary amine, and ammonium acetate under thermal solvent-free conditions. The remarkable features of this new procedure are high conversions, cleaner reaction, simple experimental and work-up procedures and also the catalyst can be easily separated from the reaction mixture and reused several times without any loss of its activity.
Arabian Journal of Chemistry, 2013
SiO 2 -Pr-SO 3 H has been used as an efficient catalyst for an improved and rapid synthesis of 1,2,4,5-tetrasubstituted imidazoles, by four-component, one-pot reaction of 1,2-diketones, aryl aldehydes, ammonium acetate and substituted aromatic amines in excellent yields under solventfree conditions.
Journal of Molecular Catalysis A: Chemical, 2011
An efficient and one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles catalyzed via solid acid nano-catalyst
Silica-supported Preyssler Nanoparticles as New Catalysts in the Synthesis of 4(3 H )-Quinazolinones
2009
A new and efficient method for the preparation of 4(3 H )-quinazolinones from the condensation of anthranilic acid, orthoester and substituted anilines, in the presence of catalytic amounts of silica-supported Preyssler nanoparticles is reported. The catalyst performs very well in comparison with other catalysts reported before. An important advantage of this catalyst is the ease of separating it from the reaction mixture, as well as the fact that it could be recycled a number of times. Keywords: 4(3 H )-Quinazolinones, recyclable catalyst, silica-supported Preyssler nanoparticles, heteropolyacids
Antimony trichloride absorbed on silica gel (SbCl3/SiO2) efficiently catalyses the four-component cyclocondensation of 1,2-diketone, aldehyde, ammonium acetate, and primary amine under solvent-free conditions to afford the corresponding tetrasubstituted imidazoles in high yields. The main merit of this study is introducing a novel catalyst to successful synthesis of a wide range of 1,2,4,5-tetrasubstituted imidazoles for the first time. The proposed method involves features such as simplicity, generality, fairly good efficiency, and reusability of the catalyst.
International Journal of Pharmaceutical Sciences and Research., 2023
A facile, highly efficient, simple, and convenient method for synthesizing 2, 4, 5-trisubstituted imidazole derivatives from the condensation of various substituted benzaldehyde, benzil, and ammonium acetate by using a catalytic amount of PEG-SOCl in the presence of water at room temperature or under microwave irradiation. PEG-SOCl is an effective heterogeneous catalyst and easy to separate. We have investigated that PEG-SOCl catalytic system was excellent recycled and reused three times without any loss of catalytic activity. PEG-SOCl act as a green catalyst, low-cost, non-volatile, non-hazardous, environmental friendly catalyst, and water is a green solvent reaction carried out at room temperature or under microwave radiation method shows greater advantages because it has contributed in the green chemistry aspects. The prepared catalyst was analyzed by analytical methods such as infrared spectrum (IR), X-Ray diffraction pattern (XRD), thermo-gravimetric analysis (TGA), and BET surface analysis. Spectroscopic techniques identified the synthesized pure product (1j), including infra-red (IR) spectrum, 1 H and 13 C NMR spectrum and Mass (LC-MS) spectrometry.