Montmorillonite KSF Clay Research Articles

Metal free montmorillonite KSF clay catalyzed practical synthesis of benzoxazoles and benzothiazoles under aerobic conditions

An efficient method for the synthesis of benzoxazoles and benzothiazoles via montmorillonite KSF clay catalyzed condensation reaction between 2-aminophenols or 2-aminothiophenols and β-diketones is reported. The efficiency of the reaction reflects from the wide substrate scope with electronic differentiation on aryls. The reaction is metal free and proceeds without the exclusion of air or moisture, and further the catalyst can be recycled up to 3–5 catalytic cycles.

An Efficient, Convenient, and Solvent-Free Synthesis of 2,3-Dihydroquinazolin-4(1 H)-ones Using Montmorillonite-KSF Clay as a Heterogeneous Catalyst

Quinazolinones have a unique position in pharmaceutical and medicinal chemistry due their diversified biological activities.1 Quinazolinone derivatives act as the building blocks of more than 150 n...

Solvent free one pot synthesis of amidoalkyl naphthols over phosphotungstic acid encapsulated montmorillonite clay catalysts

Montmorillonite KSF clay was effectively modified by the encapsulation of phosphotungstic acid into the clay layers via sonication followed by incipient wet impregnation method. The prepared catalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques. The catalytic activities of the prepared systems were investigated in the solvent free synthesis of amidoalkyl naphthols by the multicomponent one-pot condensation of an aldehyde, β-naphthol and an amide or urea. Excellent yield, shorter reaction time, easy work-up, and reusability of the catalyst are the main attractions of this green procedure.

ChemInform Abstract: An Expeditious Synthesis of Flavonols Promoted by Montmorillonite KSF Clay and Assisted by Microwave Irradiation under Solvent‐Free Conditions.

A simple, efficient, rapid, and ecofriendly synthesis of flavonols in >90% yield from 2′-(mesyloxy)epoxychalcones (=2-(3-aryl-2,3-epoxypropanoyl)phenyl methanesulfonates) promoted by montmorillonite KSF clay and assisted by microwave irradiation has been described.

Montmorillonite Clay Catalyzed Three Component, One-Pot Synthesis of 5-Hydroxyindole Derivatives

A highly efficient and environmentally benign protocol has been developed for the first time to produce a wide range of biologically active 5-hydroxyindole derivatives using montmorillonite KSF clay as a reusable solid acid catalyst. The use of recyclable clay makes this procedure quite simple, more convenient and cost-effective.

An Expeditious Synthesis of Flavonols Promoted by Montmorillonite KSF Clay and Assisted by Microwave Irradiation under Solvent‐Free Conditions

AbstractA simple, efficient, rapid, and ecofriendly synthesis of flavonols in >90% yield from 2′‐(mesyloxy)epoxychalcones (=2‐(3‐aryl‐2,3‐epoxypropanoyl)phenyl methanesulfonates) promoted by montmorillonite KSF clay and assisted by microwave irradiation has been described.

Recyclable clay supported Cu (II) catalyzed tandem one-pot synthesis of 1-aryl-1,2,3-triazoles

Montmorillonite KSF clay supported CuO nanoparticles efficiently catalyzes one-pot aromatic azidonation of aryl boronic acids followed by regioselective azide–alkyne 1,3-dipolar cycloaddition (CuAAC) reaction producing corresponding 1-aryl-1,2,3-triazole derivatives at room temperature in excellent yields without use of any additives. Investigations on mechanism of CuAAC revealed that sodium azide, which is used as azidonating reagent in one-pot protocol reduces Cu(II) to click-active Cu(I). The catalytic efficiency of another Cu(II) source CuSO4 in combination with NaN3 for this one-pot CuAAC protocol, further supported our mechanism. This is the first report for use of Cu(II)/NaN3 catalytic system for CuAAC protocol. The clay–Cu(II) catalyst being ligand-free, leaching-free, easy to synthesize from inexpensive commercially available precursors, recyclable, and environmentally friendly will be highly useful for economical synthesis of 1,4-disubstituted 1,2,3-triazoles.

Bismuth nitrate-induced microwave-assisted expeditious synthesis of vanillin from curcumin

BackgroundCurcumin and vanillin are the two useful compounds in food and medicine. Bismuth nitrate pentahydrate is an economical and ecofriendly reagent.MethodBismuth nitrate pentahydrate impregnated montmorillonite KSF clay and curcumin were subjected to microwave irradiation.ResultsMicrowave-induced bismuth nitrate-promoted synthesis of vanillin from curcumin has been accomplished in good yield under solvent-free condition. Twenty-five different reaction conditions have been studied to optimize the process.ConclusionThe present procedure for the synthesis of vanillin may find useful application in the area of industrial process development.

ChemInform Abstract: An Efficient and Clean Synthesis of Symmetrical and Unsymmetrical 3,3‐Di(indolyl)indolin‐2‐ones Using KSF.

AbstractBoth symmetrical (III) and unsymmetrical (IV) 3,3‐di(indolyl)indolin‐2‐ones are obtained in a simple and convenient procedure using montmorillonite KSF clay as heterogeneous catalyst.

ChemInform Abstract: Regeneration of Aldehydes from Bisulfite Addition Products in the Solid State Using Montmorillonite KSF Clay under Microwave Irradiation.

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 Abstract: Montmorillonite KSF Clay as Novel and Recyclable Heterogeneous Catalyst for the Microwave Mediated Synthesis of Indan‐1,3‐diones.

AbstractChemInform 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.

Montmorillonite KSF Clay as Novel and Recyclable Heterogeneous Catalyst for the Microwave Mediated Synthesis of Indan-1,3-Diones

Various indan-1,3-dione derivatives were synthesized from the reaction of different phthalic anhydrides with diethylmalonate using montmorillonite KSF clay as a recyclable heterogeneous acidic catalyst and microwave irradiation in good yields and short reaction times.

Montmorillonite clay-catalyzed cyclotrimerization and oxidation of aliphatic aldehydes

A temperature-dependent equilibrium is observed for the cyclotrimerization of aliphatic aldehydes in the presence of Montmorillonite K10 clay, while aerobic oxidation of aliphatic aldehydes to the corresponding carboxylic acids is favored at room temperature in the presence of Montmorillonite KSF clay.

Montmorillonite Clay Catalyzed Synthesis of Enantiomerically Pure 1,2,3,4-Tetrahydroquinolines

Arylamines undergo smooth cyclization with 2-deoxy-d-ribose on the surface of montmorillonite KSF clay under mild conditions to afford the corresponding sugar-derived chiral tetrahydroquinolines in high yields with moderate diastereoselectivity. The assignment of the stereochemistry of the product was achieved by various NMR studies.

Montmorillonite KSF clay as an efficient catalyst for the synthesis of 1,4-dioxo-3,4-dihydrophthalazine-2(1 H)-carboxamides and -carbothioamides under solvent-free conditions using microwave irradiation

Different 1,4-dioxo-3,4-dihydrophthalazine-2(1 H)-carboxamide and -carbothioamide derivatives were synthesized in a simple and environmentally benign method from the reaction of different phthalic anhydrides with semicarbazide or thiosemicarbazide using montmorillonite KSF clay as solid acidic catalyst and microwave irradiations under the solvent-free conditions in good yields and short reaction times.

Montmorillonite KSF Catalyzed One‐Pot Synthesis of Hexahydro‐1H‐pyrrolo[3,2‐c]quinoline Derivatives.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Montmorillonite KSF clay as novel and recyclable heterogeneous solid acid for the conversion of d-glycals into furan diol

A simple, efficient and environmentally benign protocol has been developed for the conversion of glycals into 2-( d-glycero-1,2-dihydroxy ethyl) furan derivatives using montmorillonite KSF as inexpensive and environmentally benign solid acid to afford excellent yields with high selectivity.

Montmorillonite KSF Clay‐Promoted Synthesis of Enantiomerically Pure 5‐Substituted Pyrazoles from 2,3‐Dihydro‐4H‐pyran‐4‐ones.

AbstractFor Abstract see ChemInform Abstract in Full Text.

Montmorillonite KSF-catalyzed one-pot synthesis of hexahydro-1 H-pyrrolo[3,2- c]quinoline derivatives

Aryl amines react with endocyclic ene-carbamates such as tert-butyl 2,3-dihydro-1 H-1-pyrrolecarboxylate and tert-butyl 1,2,3,4-tetrahydro-1-pyridinecarboxylate, on the surface of montmorillonite KSF clay under mild conditions to afford the corresponding 3-aminopropylhexahydropyrrolo[3,2- c]quinoline or 4-aminobutyloctahydrobenzo[ h][1,6]naphthyridine derivatives in excellent yields with moderate diastereoselectivity.

Montmorillonite Clay Catalyzed Alkylation of Pyrroles and Indoles with Cyclic Hemi‐Acetals.

AbstractFor Abstract see ChemInform Abstract in Full Text.