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Carbon-Based Solid Acid as An Efficient and Reusable Catalyst for One-Pot Synthesis of Tetrasubstituted Imidazoles under Solvent-Free Conditions

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Chinese Journal of Chemistry 2011年第1期29卷 203-206页

作者： tavakoli-hoseini, Niloofar davoodnia, abolghasem Department of Chemistry Faculty of Sciences Islamic Azad University Mashhad Branch Mashhad lran

Carbon-based solid acid catalyst was found to be highly efficient, eco-friendly and recyclable heterogeneous catalyst for the multicomponent reaction of benzil, aromatic aldehyde, primary amine and ammonium acetate, giving rise to 1,2,4,5-tetrasubstituted imidazoles in good to excellent yields. The present methodology offers several advantages, such as high yields, short reaction time, mild reaction condition and a recyclable catalyst with a very easy work up.

关键词： carbon-based solid acid heterogeneous catalysis multicomponent reaction tetrasubstituted imidazole,solvent-free condition

Synthesis of Pyrazolo[3,4-d]pyrimidin-4-ones Catalyzed by Brensted-acidic Ionic Liquids as Highly Efficient and Reusable Catalysts

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Chinese Journal of Chemistry 2011年第11期29卷 2421-2426页

作者： tavakoli-hoseini, Niloofar Moloudi, Raheleh davoodnia, abolghasem Shaker, Mohammad Department of Chemistry Mashhad Branch Islamic Azad University Mashhad Iran

A convenient and efficient method for the synthesis of pyrazolo[3,4-d]pyrimidin-4-ones via heterocyclization reaction of 5-amino-lH-pyrazole-4-carboxamides with triethyl orthoesters using two BrCnsted-acidic ionic liquids, 3-methyl-l-（4-sulfonic acid）butylimidazolium hydrogen sulfate [MIM＋（CH2）4SO3H][ HSO4 ] or N-（4-sulfonic acid）butyl triethylammonium hydrogen sulfate [Et3N＋（CH2）4SO3H][ HSO4 ], as efficient homogeneous catalysts under solvent-free conditions is described.

关键词： homogeneous catalysis ionic liquids pyrazolo[3,4-d]pyrimidin-4-ones solvent-free condition triethyl orthoesters

SO3H-Functionalized Ionic Liquids： Green, Efficient and Reusable Catalysts for the Facile Dehydration of Aldoximes into Nitriles

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Chinese Journal of Chemistry 2011年第5期29卷 978-982页

作者： davoodnia abolghasem Khojastehnezhad Amir Bakavoli Mehdi tavakoli-hoseini Niloofar Department of Chemistry Faculty of Sciences Mashhad Branch Islamic Azad University Mashhad Iran

Easily synthesized aldoximes have been converted to the corresponding nitriles under very mild conditions by a simple reaction using two halogen-free SO3H-functionalized ionic liquids, 3-methyl-l-（4-sulfonic acid）butylimidazolium hydrogen sulfate [MIM（CH2）aSO3H][HSO4] and 1-（4-sulfonic acid）butylpyridinium hydrogen sulfate [PY（CH2）4SO3H][HSO4], as catalyst and reaction medium without any additional organic solvent. The method was equally effective for aromatic aldoximes bearing electron-donating and electron-withdrawing substituents. Taking into account environmental and economical consideration, the protocol presented here has the merits of environmentally friendly, simple operation, easy work-up and very good yields. The catalysts could be recycled and reused for several times without noticeably decreasing in their catalytic activities.

关键词： ionic liquid aldoxime nitrile dehydration

Silica Gel-Supported Polyphosphoric Acid （PPA/SiO2）： An Efficient and Reusable Heterogeneous Catalyst for Facile Synthesis of 14-Aryl-14H-dibenzo[aj]xanthenes under Solvent-free Conditions

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Chinese Journal of Chemistry 2011年第2期29卷 297-302页

作者： Khojastehnezhad Amir davoodnia abolghasem Bakavoli Mehdi tavakoli-hoseini Niloofar Zeinali-Dastmalbaf Mohsen Department of Chemistry Faculty of Sciences Islamic Azad University Mashhad Branch Mashhad Iran

A simple, efficient and green method for the synthesis of 14-aryl-14H-dibenzo[aj]xanthenes by a one-pot condensation reaction of β-naphthol and aryl aldehydes using silica gel-supported polyphosphoric acid （PPA/SiO2）, an effective and reusable catalyst, under solvent-free conditions is described. The present methodology offers several advantages, such as a simple procedure with an easy work-up, short reaction times, high yields, and the absence of any volatile and hazardous organic solvents.

关键词： 14-Aryl-14H-dibenzo[a,j]xanthenes PPA/SiO2 heterogeneous catalysis green chemistry solvent-flee conditions

四丁基铵钨多酸[TBA]2[W6O19]:无溶剂条件下通过不对称汉斯反应快速合成聚氢化喹啉的新型可重复使用的非均相催化剂(英文)

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催化学报 2013年第6期34卷 1173-1178页

作者： abolghasem davoodnia Maryam KHASHI Niloofar tavakoli‐hoseini Department of Chemistry Mashhad BranchIslamic Azad UniversityMashhadIran

A novel, efficient, and environmentally friendly method for the synthesis of polyhydroquinoline derivatives by a one‐pot, four‐component unsymmetrical Hantzsch condensation of dimedone, aldehydes, ethyl acetoacetate, and ammonium acetate in the presence of a catalytic amount of tetrabutylammonium hexatungstate [TBA]2[W6O19] under solvent‐free conditions has been developed. The results showed that this heterogeneous catalyst has high catalytic activity and the desired products were obtained in good to high yields. Moreover, the catalyst was found to be reusable and considerable catalytic activity was still achieved after the fifth run.

关键词： Heterogeneous catalysis Polyhydroquinolines Tetrabutylammonium hexatungstate

无溶剂条件下碳基固体酸催化一锅法合成酰胺烷基萘酚(英文)

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催化学报 2014年第4期35卷 490-495页

作者： abolghasem davoodnia Rahil Mahjoobin Niloofar tavakoli-hoseini Department of Chemistry Faculty of SciencesMashhad BranchIslamic Azad University

An efficient, environmentally friendly procedure for the synthesis of amidoalkyl naphthols through the one‐pot, three‐component reaction of β‐naphthol, aryl aldehydes, and acetamide in the presence of a carbon‐based solid acid under thermal solvent‐free conditions is described. The beneficial fea-tures of this new synthetic approach include short reaction time, high yields, clean reaction profiles, and a simple work‐up procedure. Furthermore, the catalyst can be readily recycled and reused four times without obvious significant loss of activity. The structure of the catalyst was confirmed by Fourier transform infrared spectroscopy, N2 adsorption/desorption analysis, and X‐ray diffraction.

关键词：一锅法合成无溶剂条件固体酸催化 β-萘酚胺烷基碳基简便反应时间

高效可重复使用多相催化剂Ce(SO_4)_2·4H_2O用于无溶剂一锅合成2,3-二氢喹唑啉-4(1H)-酮(英文)

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催化学报 2014年第7期35卷 1054-1058页

作者： abolghasem davoodnia Maryam Khashi Niloofar tavakoli-hoseini Department of Chemistry Mashhad BranchIslamic Azad University MashhadIran

Cerium(IV) sulfate tetrahydrate, Ce(SO4)2·4H2O, is a novel inorganic solid acidic catalyst that efficiently catalyzes the synthesis of 2,3-dihydroquinazolin-4(1H)-ones via the one-pot three- component reaction of isatoic anhydride, aromatic aldehydes, and a nitrogen source(ammonium acetate, ammonium carbonate, ammonium chloride, or methylamine) under solvent-free conditions. The desired products are obtained in short reaction time with high yields. The catalyst is inexpensive and readily available and can be recovered conveniently and reused such that considerable catalytic activity can still be achieved after the fifth run. Easy work-up and avoiding the use of harmful organic solvents are other advantages of this simple procedure.

关键词：非均相催化剂无溶剂条件一锅法合成硫酸盐喹唑啉可重复使用二氢铈

磺化碳催化Biginelli反应一锅法合成3,4-二氢-2(1H)-酮和硫酮(英文)

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催化学报 2012年第4期33卷 706-710页

作者： Maryam MOGHADDAS abolghasem davoodnia Majid M.HERAVI Niloofar tavakoli-hoseini Department of Chemistry Mashhad BranchIslamic Azad University Department of Chemistry School of SciencesAlzahra University

A sulfonated carbon material was shown to be a highly efficient,eco-friendly,and recyclable solid acid catalyst for the Biginelli reaction of β-ketoester,aldehyde,and urea or thiourea under solvent-free *** gave 3,4-dihydropyrimidin-2(1H)-ones and-thiones in good to excellent *** method has the advantages of a simple procedure with easy work-up,short reaction time,and high *** catalyst can be recycled after a simple work-up and was reused four times without substantial reduction in activity.

关键词：化学催化高压高温

A new route to the synthesis of thieno[2,3-d]pyrimidin-4(3H)-one derivatives catalyzed by 12-tungstophosphoric acid (H_3PW_(12)O_(40))

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Chinese Chemical Letters 2007年第12期18卷 1483-1486页

作者： A.davoodnia M.Bakavoli Gh.Barakouhi N.tavakoli-hoseini Department of Chemistry School of SciencesIslamic Azad UniversityMashhad 91735-413Iran

Heteropoly acid H3PW12040 （PW） has been used as an effective catalyst for the synthesis of thieno[2,3-d]pyrimidin-4（3H）-one derivatives. The present methodology offers several advantages, such as high yields, shor... 详细信息

关键词： Thieno[2,3-d]pyrimidin-4(3H)-one Heteropoly acid 12-Tungstophosphoric acid Orthoesters