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Synthesis and mass spectral fragmentations of new spiro heterocycles

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Chinese Chemical Letters 2007年第6期18卷 689-693页

作者： Mohammad rahimizadeh Ali Shiri Mehdi Bakavoli Department of Chemistry School of Sciences Ferdowsi University Mashhad 91775-1436 Iran

The reaction of dichlorodiphenoxymethane (2) with ortho-functionlized benzoic acids 1a–c yielded the spiro derivatives of bezodioxinone 4a, benzoxazinone 4b and benzodioxepinone 4c. The same reaction with 1,8-diaminonaphthalene afforded the spiro perimidine 6, while with 1,1′-binaphthyl-2,2′-diol gave the semi-cyclized derivative 2,2-diphenoxydinaphthodioxepine 8.

关键词： Spiroorthocarbonate Azaspiro compounds Oxaazaspiro compounds

Synthesis of new indolyl crown ethers catalyzed with ferric hydrogensulfate

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Chinese Chemical Letters 2012年第6期23卷 673-676页

作者： Hossein Eshghi Mohammad rahimizadeh Zahra Bakhtiarpoor Mehdi Pordel Department of Chemistry School of SciencesFerdowsi University of MashhadP.O.Box 91775-1436Mashhadlran Department of Chemistry Faculty of Sciences Islamic Azad UniversityMashhad BranchMashhadlran

Efficient reaction of bis-indolyl podand with different aldehydes using Fe（HSO4）3 as catalyst to afford the corresponding new indolyl crown ethers is described. The structures of three distinct isomers have been opt... 详细信息

关键词： Ferric hydrogensulfate Bis-indolyl podand Indolyl crown ether Fe(HSO4)3

Selective monotetrahydropyranylation of symmetrical diols using P_20_5/Si0_2 under solvent-free conditions and their depyranylation

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Chinese Chemical Letters 2008年第9期19卷 1063-1067页

作者： Hossein Eshghi Mohammad rahimizadeh Sattar Saberi Department of Chemistry Ferdowsi University of MashhadMashhad 91775-1436Iran

Selective protection of one of the hydroxyl group in 1, n-symmetrical diols is achieved by P2O5/SiO2-catalyzed reaction of the diol with dihydropyran under solvent-free conditions at room temperature. This selective protection is simple and it occurred under economically cheap conditions in high yield. The deprotected diol is simply obtained by refluxing of this compound in methanol using the same catalyst without any byproduct formation or additional purifications.

关键词： Heterogeneous catalyst P2O5/SiO2 Monotetrahydropyranylation Protecting group Symmetrical diols

Clean heterocyclic synthesis in water:I_2/KI catalyzed one-pot synthesis of quinazolin-4(3H)-ones

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Chinese Chemical Letters 2008年第12期19卷 1403-1406页

作者： Mehdi Bakavoli Ali Shiri Zahra Ebrahimpour Mohammad rahimizadeh Department of Chemistry School of SciencesFerdowsi UniversityMashhad 91775-1436Iran

Oxidative cyclocondensation of o-aminobenzamide with various aldehydes in water using I2/KI as catalyst and oxidizing agent is carded out giving the corresponding quinazolin-4（3H）-ones 3a-n in good to excellent yields.

关键词： Iodine Quinazolinone Cyclocondensation

Efficient synthesis of novel 9H-xanthen-9-yl derivatives of bidentate heterocyclic nucleophiles by Fe(HSO_4)_3 as a catalyst

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Chinese Chemical Letters 2012年第10期23卷 1153-1156页

作者： Hossein Eshghi Mehdi Bakavoli Javad Abedini-Torghabeh Mohammad rahimizadeh Department of Chemistry School of SciencesFerdowsi University of MashhadP.O.Box 91775-1436MashhadIran

We have demonstrated the direct substitution of 9H-xanthen-9-ol with different nucleophilic reagents such as thiazoles, triazoles, tetrazoles, hydrazines and hydrazinecarboxamides in good to high yields. This reaction catalyzed by ferric hydro- gensulfate as a heterogeneous acid catalyst in ethanol through SN1 type reaction of pyrylium with a nucleophilic reagent afforded the heterocycle- and aromatic-N-substituted xanthene derivatives as simple marked molecules in short reaction times.

关键词： Xanthen Ferric hydrogensulfate Nucleophilic reagents SN1 type

Preyssler-type heteropoly acid:A new,mild and efficient catalyst for protection of carbonyl compounds

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Chinese Chemical Letters 2011年第4期22卷 435-438页

作者： Mohammad rahimizadeh Tahmineh Bazazan Ali Shiri Mehdi Bakavoli Hassan Hassani Department of Chemistry School of SciencesFerdowsi University of Mashhad91775-1436 MashhadIran Department of Chemistry Payam Noor UniversityBirjandIran

Preyssler-type heteropoly acid is introduced as a new,mild and efficient catalyst for protection of a variety of carbonyl compounds with 1,3-propane dithiol.

关键词： Preyssler-type heteropoly acid Protection Carbonyl groups 1 3-Propanedithiol

Microwave activated synthesis of 2-aryl-quinazolin-4(3H)ones

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Chinese Chemical Letters 2007年第12期18卷 1466-1468页

作者： M.Bakavoli O.Sabzevari M.rahimizadeh Department of Chemistry School of SciencesFerdowsi UniversityMashhad 91775-1436Iran

A highly efficient synthesis of 2-aryl-quinazolin-4（3H）ones was performed by one-pot oxidative heterocyclization of 2- aminobenzamide with aldehydes in the presence of potassium permanganate in dimethylacetamide und... 详细信息

关键词： Quinazolinones Microwave 2-Aminobenzamide Aldehydes

H-Y-zeolites induced heterocyclization:Highly efficient synthesis of substituted-quinazolin-4(3H) ones under microwave irradiation

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Chinese Chemical Letters 2007年第5期18卷 533-535页

作者： M. Bakavoli O. Sabzevari M. rahimizadeh Department of Chemistry School of Sciences Ferdowsi University Mashhad 91775-1436 Iran

A highly efficient synthesis of 2-amino-N-substituted-benzamides was performed by the condensation ofisatoic anhydride with several amines in solvent-free conditions under microwave irradiation. H-Y-zeolites induced heterocyclization of these products with ortho-esters under similar conditions afforded the relevant substituted-quinazolin-4（3H）ones in high yields.

关键词： Isatoic anhydride 2-Aminobenzamide H-Y-zeolite Quinazolinones

绿色可磁性分离二氧化硅包裹镍铁尖晶石负载硫酸氢铁纳米粒子催化剂用于合成1,8-二氧十氢吖啶合成(英文)

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催化学报 2014年第3期35卷 376-382页

作者： Amir Khojastehnezhad Mohammad rahimizadeh Hossein Eshghi Farid Moeinpour Mehdi Bakavoli Department of Chemistry Faculty of Sciences Ferdowsi University of Mashhad Mashhad Iran Department of Chemistry Islamic Azad University-Bandar Abbas Branch Bandar Abbas *** Iran

A new magnetically separable catalyst consisting of ferric hydrogen sulfate supported on silica-coated nickel ferrite nanoparticles was *** synthesized catalyst was characterized using vibrating sample magnetometry,X-ray diffraction,transmission electron microscopy,scanning electron microscopy,and Fourier transform infrared *** new magnetic catalyst was shown to be an efficient heterogeneous catalyst for the synthesis of 1,8- dioxodecahydroacridines under solvent-free *** catalyst is readily recovered by simple magnetic decantation and can be recycled several times with no significant loss of catalytic activity.

关键词：催化剂包镍铁氧体硫酸氢磁性分离纳米粒子二氧化硅合成铁素体