Dariush Saberi

Persian Gulf University | PGU · Department of Chemistry

One-pot three components effective methods are reported for the synthesis of two important families of organic compounds, 2H-pyrrolo[2,3-d]pyrimidine-2,4(3H)-diones substituted 5-(3-hydroxy-1,4-naphthoquinonyl) and 1H-benzo[f]indole-4,9-diones substituted 3-(3-hydroxy-1,4-naphthoquinonyl), by employment of new starting materials. The formers were p...

Guanine stabilized on the surface of silica-modified magnetic nanoparticles, by the propyl group as a linker, (Fe3O4@SiO2-n-(propyl)-guanine), was prepared, identified and used as a recyclable base in the synthesis of novel spirooxindole compounds and highly substituted dihydro-2-oxopyrroles in aqueous media. Fe3O4@SiO2-n-(propyl)-guanine was chara...

Time and again, SBA-15-based composites as mesoporous materials and the incorporation of transition metals in them have been attracting dramatic attention in the field of catalysis due to their remarkable features. In this paper, the activity of SBA-15 supported ionic liquid-Pd(ii) has been investigated in the catalytic transfer hydrogenation of ni...

Background and Objectives Pests and their controlling pesticides are among the most serious threats to the health of agricultural products. The present study was aimed to investigate the effect of genotype and the possibility of replacing chemical pesticides controlling fruit borer by some compounds of natural origin for plant traits improvement an...

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A one-pot, clean and green procedure is described for the syntheses of new azocine derivatives via addition reactions of enaminones with acenaphthoquinone followed by periodic acid-mediated oxidative cleavages of the corresponding vicinal diols. Various derivatives of azocine were prepared and well characterized. The excellent yields, simple synthe...

A new ruthenium/dendrimer complex stabilized on the surface of silica‐functionalized nano‐magnetite was fabricated and well characterized. The nano‐catalyst showed good activity in the synthesis of benzil derivatives via the oxidation of stilbenes with high turnover frequency (TOF) at room temperature. Moreover, the catalyst could also be reused up...

A desirable alternative to organic solvents, very cheap, non‐toxic and biodegradable deep eutectic solvent (DES) based on choline chloride and urea was introduced for 2,4,6‐trichloro triazine mediated amide bond formation between carboxylic acids and amines at room temperature. Sub‐stoichiometric amount of TCT was used as a cheap and readily availa...

C–O bond formation between terminal alkenes/benzyl alcohols as an arylcarboxy surrogate and carbonyl compounds in a biodegradable deep eutectic solvent (DES) based on choline chloride and urea was performed. By employment of TBAI as catalyst and TBHP as oxidant, various derivatives of carbonyl compounds were benzylated in α position in good to high...

Sulfamic acid stabilized on the surface of silica by the n-propyl organic group linker which is named silica-bonded N-propylsulfamic acid was applied as an efficient heterogeneous catalyst with good recyclability and reusability for direct benzylation of 1,3-dicarbonyl compounds using secondary aromatic alcohols or styrenes as alkylating agents in...

All available conformers of tisopurine as an important pharmaceutical molecule are optimized and frequency calculations calculated at M06-2X/6-311++G(2d,2p) level of theory. These conformers are classified in 22 different tautomers, tautomer Z showing the most stable tautomer in the gas phase. Effects of four different solvents on the most stable c...

All 66 conformers of guanylurea were optimized and frequency calculations were performed at M06-2X/6-311++G(d,p) level of theory. Theses conformers were categorized into five tautomers, and the most stable conformer of each tautomer were found. Geometrical parameters indicated that these tautomers have almost planar structure. Complete stepwise tau...

A new pathway was developed for the synthesis of benzyl benzoates via TBAI-mediated oxidative self-coupling of benzyl bromides in the presence of tert-butyl hydroperoxide (TBHP) as an oxidant under solvent-free conditions. Various derivatives of precursors including electron donating and withdrawing groups as well as heteroaromatic and polycyclic b...

Magnetite nanoparticles coated with mesoporous silica, Fe3O4@SiO2, were prepared. Surface functionalization of this core-shell nanocomposite with (3-aminopropyl) trimethoxysilane (APTMS) followed by its reaction with Cu(OAc)2 was resulted to develop a new heterogeneous copper complex (Fe3O4@SiO2-APTMS-Cu). The structure and composition of synthesiz...

A new rhodamine-B carbonyl-morpholine derivative (denoted as RECM) was prepared by a two-step synthesis procedure. The employed method allowed a lactam ring development of rhodamine-B and ethylenediamine to demonstrate a facile amide bond formation. The obtained RECM was confirmed by 1H NMR, 13C NMR, and mass spectrometry analysis. RECM was formed...

Copper oxide supported on magnetic nanoparticles was used as a green magnetic nanocatalyst for hydroamination of carbodiimides towards the synthesis of guanidines. Easy preparation and separation, low cost, non-sensitivity to moisture and reusability of the catalyst along with diversity and high yield of products are significant features of this me...

Synthesis of enol carbamates was achieved via nickel-catalyzed oxidative coupling of formamides with 1,3-dicarbonyl compounds in the presence of tert-butyl hydroperoxide at 40 °C. Various derivatives of enol carbamates were synthesized by this method in good to excellent yields.

A new, powerful and recyclable copper catalyst were prepared by heterogenization of copper chloride using of Fe3O4 nano particles modified with citric acid as a linker. This system can catalyze reduction of nitroaren compound to aniline derivatives in the presence of Sodium borohydride as a reduction agent in moderate to good yields. In addition, e...

A highly selective and sensitive colorimetric sensor for the determination of naproxen (NAP) based on the aggregation of the thiolated β-cyclodextrin (Tβ-CD) functionalized gold nanoparticles (Tβ-CD-Au NPs) in the presence of NAP and Zn(2+)is described. The hydrophobic end of NAP interacts with the immobilized Tβ-CD on the Au NPs and forms the comp...

Solvent-free room temperature synthesis of tert-butyl peresters was achieved via copper-catalyzed oxidative-coupling of benzyl cyanides with tert-butyl hydroperoxide in short reaction times. Various derivatives of tert-butyl peresters were synthesized by this pathway in good to excellent yields. Further investigation revealed that the above-mention...

A novel one-pot procedure for the synthesis of benzil derivatives was developed via the sequential Heck-oxidation reaction of aryl (I and Br) halides with styrenes. In-situ generated stilbene scaffolds were directly converted to the corresponding diaryl 1,2-diketones. In the present transformation, tetrabutylammonium iodide (TBAI) was employed as a...

A highly selective and sensitive colorimetric sensor for the determination of nabumetone (NAB) based on the aggregation of the thiolated β-cyclodextrin (Tβ-CD) functionalized gold nanoparticles (Au-NPs) with NAB in the presence of polyvinylpyrrolidone (PVP) was developed. Thiolated β-cyclodextrin bonds to the surface of Au-NPs and forms a complex w...

No abstract is available for this article.

Condensation reaction between ninhydrin and various 1,3-dicarbonyl compounds followed by oxidative cleavage of furans (III) afford the title compounds.

A simple and efficient procedure for the synthesis of 5-methyl-3,3′-dioxo-3H,3′H-spiro[furan-2,1′-isobenzofuran]-3,3′-dione derivatives, proceeding via a condensation reaction between ninhydrin and various 1,3-dicarbonyl compounds followed by oxidative cleavage of the corresponding 3a,8b-dihydroxy-2-methyl-4-oxo-4,8b-dihydro-3aH-indeno[1,2-b]furans...

A diastereoselective synthesis of some new N-containing heterocyclic compounds, indeno[2″,1″: 4′,5′]furo[3′,2′: 5,6]pyrido[2,3-d]pyrimidine-2,4,6(1H,3H)-trione derivatives, is presented. Products were obtained in good to excellent yields by the reaction of amino(thio)uracils with 2-hydroxy-2-(3-oxobut-1-en-2-yl)-2H-indene-1,3-dione in AcOH under re...

Optimized conditions render possible the synthesis of primary, secondary, and tertiary amides from methylarenes and amine hydrochlorides.

Magnetic Fe(OH)3@Fe3O4 nanoparticles were successfully prepared and characterized. This magnetic nanocomposite was employed as an efficient, reusable and environmentally benign heterogeneous catalyst for the direct amidation of alcohols with amine hydrochloride salts. Several derivatives of primary, secondary and tertiary amides were synthesized in...

Some derivatives of nitroenamines were synthesized in moderate to good yields in the presence of sulfonic acid supported on silica-modified maghemite (γ-Fe2O3@SiO2–OSO3H) as a highly efficient and magnetically separable catalyst. Both up to five times recyclability and the magnetic separation are salient features of this catalytic system.

Mesoporous silica-coated magnetic carbon nanotubes were prepared; their surface functionalization, followed by reaction with CuI, were carried out to develop a Cu-grafted functionalized mesoporous material. This system is able to catalyze oxidative amidation of aromatic aldehydes with amine hydrochloride salts, generating amide derivatives in moder...

Paal–Knorr pyrrole synthesis was performed in the presence of superparamagnetic nanoparticles of modified sulfuric acid (γ-Fe2O3@SiO2-OSO3H) as an efficient and magnetically separable catalyst. Recovery of the catalyst was simple using a magnet, allowing its reuse without significant loss of its catalytic activity (over five cycles). Graphical Abst...

The title catalyst is successfully employed for the Strecker reaction and the Kabachnik—Fields reaction to give α-aminonitriles and phosphonates.

The title catalyst allows the direct oxidation of symmetrical and unsymmetrical secondary amines to nitrones.

Oxidative coupling of formamides with 1,3-dicarbonyl compounds to prepare enol carbamates was effected in the presence of CuO nanoparticles supported on a-Fe2O3-modified carbon nanotubes (CNTs@a-Fe2O3@CuO) as an environmentally friendly heterogeneous catalyst. The simple preparation, and the ability to be recycled and magnetically separated are sal...

Oxidative coupling of formamides with 1,3-dicarbonyl compounds to prepare enol carbamates was effected in the presence of CuO nanoparticles supported on α-Fe2O3-modified carbon nanotubes (CNTs at α-Fe2O3@CuO) as an environmentally friendly heterogeneous catalyst. The simple preparation, and the ability to be recycled and magnetically separated are...

Herein, we introduce the first magnetic CuO nanoparticles based on carbon nanotubes as a highly intriguing magnetic catalyst in Ullmann-type coupling of aryl halides with phenols. Two facile procedures were used for the preparation of this magnetically separable catalytic system. Having been treated with FeSO4 and then H2O2, nanotubes accommodated...

Silica immobilized sulfuric acid ([3-(propyl)sulfanyl]propyl]ester and N-propylsulfamic acid are employed as recyclable catalysts for the synthesis of 1,1-diacetates from the reaction between an aromatic aldehyde and acetic anhydride under mild- and solvent-free conditions at room temperature. These solid acids could be recycled several times witho...

Preparation of N-(3-silicapropyl) imidazolium hydrogen sulfate ([Sipim]HSO4) as a heterogeneous acidic ionic liquid is described. This heterogeneous ionic liquid was used as catalyst for the synthesis of α-aminonitriles by a one-pot condensation of aldehydes, amines, and trimethylsilyl cyanide at room temperature. Catalyst could be recycled for sev...

Sulfuric acid ([3-(3-silicapropyl)sulfanyl]propyl)ester is employed as a recyclable catalyst for the condensation reaction between aromatic aldehydes and 3-methyl-l-phenyl-5-pyrazolone. This condensation reaction was performed in ethanol under refluxing conditions giving 4,4′-alkylmethylene-bis(3-methyl-5-pyrazolones) in 74-90% yields. The heteroge...

Silica bonded N-propyl sulfamic acid (SBNPSA) is employed as a solid acid catalyst for the synthesis of 1,8-dioxo-decahydroacridines and 1,8-dioxo-octahydroxanthenes in high yields and short reaction times in ethanol under reflux conditions. Also, this solid acid catalyzed the reaction of 1,2-diamino compounds with 1,2-dicarbonyl compounds for the...

A silica-bonded S-sulfonic acid is shown to be an efficient catalyst for the synthesis of trisubstituted imidazoles, e.g. (III).

An easy access to xanthene and acridine derivatives using silica-bonded S-sulfonic acid as a reusable catalyst is described.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Silica-bonded S-sulfonic acid (SBSSA) is employed as a recyclable catalyst for the synthesis of α-amino nitriles. These syntheses were performed via a one-pot three-component condensation of aldehydes, amines, and trimethylsilyl cyanide under mild reaction conditions at room temperature.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Trisubstituted imidazoles have been synthesized in high yields in the presence of silica-bonded S-sulfonic acid as a catalyst. The reaction was carried out at 130°C under solvent-free conditions. The reaction work-up is simple and the catalyst is easily separated from the products by filtration.

Silica bonded S-sulfonic acid (SBSSA) was prepared by the reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in chloroform. Silica-bonded S-sulfonic acid, as a reusable solid acid catalyst, was used for the condensation reactions of indole with carbonyl compounds at ambient temperature. Tetra-(indolyl)methanes were also obtained by th...

magnified image Silica‐bonded S ‐sulfonic acid (SBSSA) has been found to be an efficient catalyst for the synthesis of 1,8‐dioxo‐decahydroacridines and 1,8‐dioxo‐octahydroxanthenes in excellent yields. The former have been synthesized from aromatic aldehydes, amines, and 5,5‐dimethyl‐1,3‐cyclohexanedione, whereas the latter from this mixture withou...

Silica-bonded S-sulfonic acid (SBSSA) was prepared by the reaction of 3-mercaptopropylsilica (NIPS) and chlorosulfonic acid in tert-butylmethyl ether, and used as a catalyst for the silylation of hydroxyl groups. A good range of primary, secondary alcohols and phenolic hydroxyl groups were effectively converted into their corresponding trimethylsil...

Silica-bonded S-sulfonic acid (SBSSA) is employed as a recyclable catalyst for the condensation reaction of aromatic aldehydes with 3-methyl-l-phenyl-5-pyrazolone. This condensation reaction was performed in ethanol under refluxing conditions giving 4,4′-alkylmethylene-bis(3-methyl-5-pyrazolones) in 75–90% yields.

A simple and efficient procedure for the preparation of silica-bonded N-propyl sulfamic acid (SBNPSA) by the reaction of 3-aminopropylsilica (1) and chlorosulfonic acid in chloroform is described. This solid acid is employed as a new catalyst for the formylation of alcohols and amines with ethyl formate under mild and heterogeneous conditions at ro...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Silica-supported tin chloride [SiO2-Sn(Cl)4-n] has been prepared by mixing tin chloride with activated silica gel in toluene under refluxing conditions for one day. A range of primary, secondary, and tertiary alcohols as well as phenolic hydroxyl groups were converted into their corresponding trimethylsilyl ethers with hexamethyldisilazane in the p...

Silica-bonded S-sulfonic acid (SBSSA) was prepared by the reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in chloroform. This solid acid has been employed as a recyclable catalyst for the synthesis of coumarins from phenols and β-keto-esters at 80°C under solvent-free conditions.

A simple and efficient procedure for the preparation of silica-bonded S-sulfonic acid (SBSSA) by reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in chloroform is described. This solid acid is employed as a recyclable catalyst for the synthesis of 1,1-diacetates from aromatic aldehydes and acetic anhydride under mild and solvent-fre...

Cited By (since 1996): 10, Export Date: 3 September 2012, Source: Scopus

The reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in chloroform afforded silica bonded S-sulfonic acid (SBSSA), which was used as a catalyst for the room temperature synthesis of quinoxaline derivatives from 1,2-diamino compounds and 1,2-dicarbonyl compounds. The catalyst could be recycled and reused several times without any los...