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Chinese Chemical Letters 2010年第5期21卷 550-553页

作者： A.Davoodnia S.Allameh A.R.Fakhari n.tavakoli-hoseini Department of Chemistry Faculty of SciencesIslamic Azad UniversityMashhad BranchMashhad 91735-413Iran

A simple and efficient procedure for the synthesis of 2-arylquinazolin-4（3H）-ones has been developed through cyclocondensation of 2-aminobenzamide with aromatic aldehydes using tetrabutylammonium bromide（TBAB） as novel neutral ionic liquid catalyst in the presence of copper（Ⅱ） chloride（CuCl;） as oxidizing agent under solvent-free conditions at 100℃.In the absence of CuCl;and under a nitrogen atmosphere,the unoxidized intermediates,2-aryl-2,3-dihydroquinazolin-4（1H）-ones,were isolated. Treatment of these intermediates with CuCl;in TBAB media gave the oxidized products 2-arylquinazolin-4（3H）-*** the other hand,cyclocondensation of 2-aminobenzamide with aromatic aldehydes in TBAB under microwave irradiation directly gave 2- arylquinazolin-4（3H）-ones.

关键词： Quinazolinones Aromatic aldehydes Tetrabutylammonium bromide(TBAB) Copper(Ⅱ) chloride(CuCl2) Microwave irradiation

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

A facile one-pot synthesis of new thieno-[2,3-d]pyrimidine-2,4(1H,3H)-dione derivatives

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Chinese Chemical Letters 2007年第10期18卷 1163-1165页

作者： A.Davoodnia H.Behmadi A.Zare Bidaki M.Bakavoli n.tavakoli hoseini Department of Chemistry School of SciencesIslamic Azad UniversityMashhad 91735-413Iran

A facile one-pot synthesis of new 3-arylthieno[2,3-d]pyrimidine-2,4（1H,3H）-diones via base-catalyzed cyclocondensation of ethyl 2-amino-4,5-dimethylthiophene-3-carboxylate with aryl isocyanates is described.

关键词： 3-Arylthieno[2,3-d]pyrimidine-2,4(1H,3H)-diones Aryl isocaynates Base-catalyzed cyclocondensation One-pot synthesis

Microwave-assisted synthesis of new pyrimido[4′,5′:4,5]thiazolo[3,2-a]benzimidazol-4(3H)-one derivatives in solvent-free condition

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Chinese Chemical Letters 2007年第11期18卷 1327-1330页

作者： A.Davoodnia M.Roshani E.Saleh nadim M.Bakavoli n.tavakoli hoseini Department of Chemistry School of Sciences Islamic Azad UniversityMashhad 91735-413Iran

Microwave-assisted synthesis of new 2-arylpyrimido[4′,5′：4,5]thiazolo[3,2-α]benzimidazol-4（3H）-ones from 3-aminothia- zolo[3,2-α]benzimidazol-2-earboxamide and aroyl halides in solvent-free condition is described. In comparison with classical conditions the reactions are faster and the yields are higher under microwave irradiation.

关键词： Pyrimidothiazolobenzimidazoles Aroyl halides Microwave irradiation Conventional heating

7-Deazapurines:Synthesis of new pyrrolo[2,3d]pyrimidin-4-onescatalyzed by a Brφnsted-acidic ionic liquid as a green and reusable catalyst

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Chinese Chemical Letters 2010年第1期21卷 1-4页

作者： A.Davoodnia M.Bakavoli R.Moloudi M.Khashi n.tavakoli-hoseini Department of Chemistry Faculty of SciencesIslamic Azad UniversityMashhad BranchMashhad 91735-413Iran

Some new 2-aryl-3,7-dihydro-4H-pyrrolo[2,3-d]pyrimidin-4-ones have been prepared through cyclocondensation of 2-amino 1H-pyrrole-3-carboxamides with aromatic aldehydes followed by air oxidation in the presence of 3-methyl-1-（4-sulfonic acid）butylimidazolium hydrogen sulfate[（CH;）;SO;HMIM][HSO;],a Br（?）nsted-acidic ionic liquid,as a green and reusable catalyst in solvent-free conditions.

关键词： Pyrrolo[2,3-d]pyrimidin-4-ones 7-Deazapurines Aromatic aldehydes Br(?)nsted-acidic ionic liquids

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

A Carbon Material as a Strong Protonic Acid for Efficient Synthesis of 4（3H）-Quinazolinones

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Chinese Journal of Chemistry 2011年第8期29卷 1685-1688页

作者： tavakoli-hoseini, niloofart Davoodnia, Abolghasem Department of Chemistry Mashhad Branch Islamic Azad University Mashhad Iran

Carbon-based solid acid catalyst has been applied to catalyzing the synthesis of 4（3H）-quinazolinones from the cyclization reaction of 2-aminobenzamide with aroyl chlorides. The results showed that the catalyst was very efficient with the average yield over 85%. This carbon material with strong protonic acid sites as heterogeneous cata- lyst has some advantages such as high activity, strikingly simple work-up procedure, non-pollution, and reusability, which will contribute to the green process greatly.

关键词： carbon-based solid acid heterogeneous catalysis 2-aminobenzamide aroyl chlorides cyclization

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