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Clean 3,4-Dihydropyrimidones Synthesis via Biginelli Reaction over Supported Molybdenum: Structural and Textural Characteristic of αMoO3

1Laboratoire de Chimie du Gaz Naturel, Faculté de Chimie, Université des Sciences et de la Technologie Houari Boumediène, USTHB, PB 32, 16111, El Alia, Bab-Ezzouar, Alger, Algeria, Algeria

2Université d’Alger I, 02 Rue Didouche Mourad, 16000 Alger Centre, Algeria

3Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, Cantoblanco, 28049 Madrid, Spain

Received: 5 Jul 2020; Revised: 14 Aug 2020; Accepted: 15 Aug 2020; Available online: 15 Sep 2020; Published: 28 Dec 2020.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2020 by Authors, Published by BCREC Group under

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A one-pot three-component synthesis of dihydropyrimidinones (DHPMs) via Biginelli reaction was carried out at 100 °C using benzaldehyde, ethyl acetoacetate and urea as reactants, in the presence of ethanol and free solvent, in heterogeneous catalytic medium. The Mo (30 wt%) metal oxides (Al2O3, SiO2 or MgO) used catalysts were prepared by sol-gel, impregnation and microemulsion methods and characterized by X-Ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray (EDX), Nitrogen Adsorption - Brunauer-Emmett-Teller (BET), and NH3-Temperature Programmed Desorption (TPD) methods. The Mo-SiO2 sample prepared by the sol-gel method exhibited the highest DHPM yield (87%), in free solvent with a reaction time of 30 min. The high efficiency, in the Biginelli reaction, of the Mo-SiO2 catalyst is due to its structural, textural and acid properties. Highly dispersed αMoO3 species of orthorhombic structure having a high contribution of strong acidic sites would be the active species in the Biginelli synthesis. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (


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Keywords: Heterogeneous catalysis; Biginelli reaction; Green chemistry; αMoO3; SiO2
Funding: Ministère de l'Enseignement Supérieur et de la Recherche Scientifique (MESRS), Algérie ; Spanish Agencia Estatal de Investigación (AEI) y el Fondo Europeo de Desar

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