Papers by Mozhgan Afshari
Tetrahedron Letters, Dec 1, 2005
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Bulletin of The Chemical Society of Ethiopia, Apr 12, 2018
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Comments on Inorganic Chemistry, Aug 8, 2022
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Processes
In this study, we present the highly efficient and rapid synthesis of substituted dihydropyrimidi... more In this study, we present the highly efficient and rapid synthesis of substituted dihydropyrimidinone derivatives through an ultrasound-accelerated approach. We utilize copper ferrite (CuFe2O4) magnetic nanoparticles as heterogeneous catalysts, employing the well-known Biginelli reaction, under solvent-free conditions. The impact of the solvent, catalyst amount, and catalyst type on the reaction performance is thoroughly investigated. Our method offers several notable advantages, including facile catalyst separation, catalyst reusability for up to three cycles with the minimal loss of activity, a straightforward procedure, mild reaction conditions, and impressive yields, ranging from 79% to 95%, within short reaction times of 20 to 40 min. Furthermore, in the context of fighting COVID-19, we explore the potential of substituted dihydropyrimidinone derivatives as inhibitors of three crucial SARS-CoV-2 proteins. These proteins, glycoproteins, and proteases play pivotal roles in the en...
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Catalysts
Sulfonated-silica-coated cobalt ferrite (CoFe2O4) magnetic nanoparticles (MNPs-SiCoFe-SO3H) are e... more Sulfonated-silica-coated cobalt ferrite (CoFe2O4) magnetic nanoparticles (MNPs-SiCoFe-SO3H) are efficient heterogeneous catalysts for the synthesis of 3,4-dihydropyrimidin-2(1H)-one and octahydroquinazoline derivatives in the absence of solvent. The effects of solvent, temperature, and catalyst amount on the reaction are investigated. The easy separation, reusability of the catalyst, simplicity of the procedure, mild reaction conditions, and good yields (68–95%) within short reaction times (15–70 min) are the advantages of this method. The catalyst can be reused up to eight times with not much loss of activity. Scanning electron microscopy images, X-ray diffraction spectra, and elemental analysis of the recycled catalyst show that the catalyst is stable after the reaction.
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Comments on Inorganic Chemistry
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Efficient oxidative dehydrogenation of 3,4-dihydropyrimidin-2(1H)-ones to pyrimidin-2(1H)-ones wa... more Efficient oxidative dehydrogenation of 3,4-dihydropyrimidin-2(1H)-ones to pyrimidin-2(1H)-ones was achieved using 1,4-bis(triphenylphosphonium)-2-butene peroxodisulfate as an oxidant under microwave irradiation. Chemoselective oxidation of 3,4-dihydropyrimidine in the presence of other oxidizable functional groups such as sulfide, alkyl, aldehyde was also achieved by this reagent.
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1,4-bis(triphenylphosphonium)-2-butene dichloride was developed as a new phase transfer catalyst.... more 1,4-bis(triphenylphosphonium)-2-butene dichloride was developed as a new phase transfer catalyst. This quaternized phosphonium salt catalyzed the regioselective ring opening of epoxides by thiocyanate ion to give β-hydroxy thiocyanates in high yields under mild conditions.
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A magnetically recoverable catalyst consisting of Mn (III) salophen complex was prepared. The syn... more A magnetically recoverable catalyst consisting of Mn (III) salophen complex was prepared. The synthesized catalyst was characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), inductively coupled plasma atomic emission spectroscopy (ICP-AES) and Fourier transform infrared (FT-IR). The immobilized catalyst was shown to be an efficient heterogeneous catalyst for the epoxidation of various alkenes using hydrogen peroxide (H2O2) as oxidant. The catalyst could be easily and efficiently isolated from the final product solution by magnetic decantation and be reused for 5 consecutive reactions without showing any significant activity degradation.
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Journal of Molecular Structure, Jul 1, 2021
Abstract A new magnetically recoverable catalyst consisting of phenanthroline Cu(II) complex supp... more Abstract A new magnetically recoverable catalyst consisting of phenanthroline Cu(II) complex supported on nickel ferrite nanoparticles was prepared. The synthesized catalyst was characterized by Fourier transform infrared spectroscopy, X‐ray diffraction, transmission and scanning electron microscopes, thermogravimetry, energy dispersive X-ray spectroscopy, vibrating sample magnetometry and inductively coupled plasma. Supported copper complex used for solvent free oxidation of 1- phenyl ethanol as a model. Influence of the reaction parameters (kind of oxidant, amount of the catalyst, reaction time, solvent and reaction temperature) were studied. Because of the immobilized complex has been shown to be an efficient heterogeneous catalyst for the selective oxidation of 1-phenyl ethanol to acetophenone (94% yield) by hydrogen peroxide so this green approach extended to other benzylic alcohols. The catalyst had been reused 10 times with no significant loss of catalytic activity. SEM, EDX, XRD, and ICP analysis of reused catalyst indicated that the catalyst was stable after the reaction.
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Advanced Powder Technology
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Russian Journal of General Chemistry
A practical, efficient and inexpensive method of synthesis of iodopyrazoles by the reaction of py... more A practical, efficient and inexpensive method of synthesis of iodopyrazoles by the reaction of pyrazoles with iodine using n-butyltriphenylphosphonium peroxodisulfate as an oxidant at room temperature is reported. The use of n-butyltriphenylphosphonium peroxodisulfate is feasible due to its easy preparation and handling, high stability and activity.
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Russian Journal of General Chemistry
An efficient one-pot synthesis of pyrimidin-2(1H)-ones via three-component condensation of aldehy... more An efficient one-pot synthesis of pyrimidin-2(1H)-ones via three-component condensation of aldehyde, ethyl acetoacetate and urea using 1,4-bis(triphenylphosphonium)-2-butene peroxodisulfate [BTPBPDS] as an oxidant is described.
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Inorganic and Nano-Metal Chemistry, 2016
ABSTRACT Sulfonic acid was anchored on the surface of silica-coated cobalt ferrite core to obtain... more ABSTRACT Sulfonic acid was anchored on the surface of silica-coated cobalt ferrite core to obtain a new magnetically separable catalyst. The resultant composite was characterized by various techniques, including FT-IR, X-ray diffraction, FESEM, energy-dispersive X-ray, TEM, TGA, and vibrating sample magnetometer. The immobilized sulfonic acid was shown to be an efficient heterogeneous catalyst for the synthesis of α-aminophosphonates under solvent-free conditions at room temperature. The catalyst is readily recovered by simple magnetic decantation and can be recycled 7 times with no significant loss of catalytic activity.
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Oriental Journal of Chemistry, 2015
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Oriental Journal of Chemistry, 2015
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Oriental Journal of Chemistry, 2013
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Oriental Journal of Chemistry, 2013
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Oriental Journal of Chemistry, 2013
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Tetrahedron Letters, 2005
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Papers by Mozhgan Afshari