Kobra Azizi - Independent Researcher (original) (raw)
Papers by Kobra Azizi
Novel Magnetically Separable Sulfated Boric Acid Functionalized Nanoparticles for Hantzsch Ester Synthesis
Synlett, 2016
ChemInform Abstract: A Catalyst-Free Synthesis of α-Aminophosphonates in Glycerol
ChemInform, 2015
ABSTRACT
Encapsulation of Pd(II) into superparamagnetic nanoparticles grafted with EDTA and their catalytic activity towards reduction of nitroarenes and Suzuki-Miyaura coupling
Applied Organometallic Chemistry, 2015
ABSTRACT
Tetrahedron Letters, 2014
ChemInform, 2014
Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as ... more Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as an efficient catalyst for the direct oxidation of secondary amines to nitrones with hydrogen peroxide as the oxidant. The catalyst could be recycled up to four times without significant loss of activity.
Direct oxidative amidation of benzyl alcohols using EDTA@Cu(II) functionalized superparamagnetic nanoparticles
Applied Catalysis A: General, 2014
ABSTRACT
Vitamin B1 supported on silica-encapsulated γ-Fe2O3 nanoparticles: design, characterization and application as a greener biocatalyst for highly efficient acylation
RSC Advances, 2014
ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hy... more ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hydrochloride) on the surface of silica-encapsulated γ-Fe2O3 nanoparticles. Its capability was evaluated in the acylation of alcohols and phenols with acetic anhydride under solvent-free conditions and afforded the desired products in high yield. This novel magnetic organocatalyst could be separated from the reaction vessel by use of an external magnet and recovered 5 times without a significant loss of its activity. The amount of loaded vitamin B1 on the silica-encapsulated γ-Fe2O3 was assigned by TGA and confirmed by back titration. Availability, cheapness and low toxicity are reasons associated with the utilization of vitamin B1 as a catalyst. The catalyst has been characterized by FT-IR, XRD, SEM, VSM and TG/DTA.
Oxidative coupling of formamides with β-dicarbonyl compounds and the synthesis of 2-aminobenzothiazole using Cu(II)-functionalized Fe3O4 nanoparticles
Tetrahedron Letters, 2015
ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-di... more ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-dicarbonyl compounds is developed using tert-butyl hydroperoxide as an oxidant. In general, the enol carbamates are synthesized in excellent yields (up to 92%) under the optimized reaction conditions. Fe3O4@EDTA–Cu(II) has the advantage of being magnetically recoverable. Also, we have established a highly efficient Fe3O4@EDTA–Cu(II)-catalyzed tandem reaction of 2-iodoanilines with isothiocyanates for the synthesis of 2-aminobenzothiazoles.
Phosphoric acid supported on alumina: A useful and effective heterogeneous catalyst in the preparation of α-amidoalkyl-β-naphthols, α-carbamato-alkyl-β–naphthols, and 2-arylbenzothiazoles
Arabian Journal of Chemistry, 2012
ABSTRACT
Ultrasound irradiation for the green synthesis of chromenes using l -arginine-functionalized magnetic nanoparticles as a recyclable organocatalyst
RSC Adv., 2014
ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a serie... more ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a series of chromene derivatives via cyclocondensation of β-naphthole, malononitrile and aromatic aldehydes, in the presence of arginine-immobilized magnetic nanoparticles, under ultrasound irradiation, in high yields. This catalyst can be easily separated from the reaction by external magnet and recycled four times without its activity loss. This methodology has shown shorter reaction times when compared with conventional thermal heating.
ChemInform Abstract: Efficient Multi-Component Synthesis of Highly Substituted Imidazoles Utilizing P 2 O 5 /SiO 2 as a Reusable Catalyst
ChemInform, 2011
ABSTRACT
Protection of Carbonyl Compounds as Diacetals Using P2O5/SiO2 and P2O5/Al2O3 as Catalysts
Chemical Science Transactions, 2012
Three-Component Synthesis of α-Amidoalkyl-β-naphthols and α-Carbamato-alkyl-β–naphthols Catalyzed by P2O5/SiO2
Chemical Science Transactions, 2012
... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, ... more ... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, 128.1 (2C), 128.2 (2C), 128.3, 128.4, 132.2, 141.8, 153.0, 168.5 ppm; IR (KBr, cm-1): 3421, 3230, 2922, 1638, 1516, 1438, 1334, 810, 741; MS (EI, 70 eV) m/z (%) = 319 (M+, 28 ...
A catalyst-free synthesis of α-aminophosphonates in glycerol
Tetrahedron Letters, 2014
ABSTRACT
ChemInform Abstract: Selective Synthesis of 2-Aryl-1-benzylated-1H-benzimidazoles
ChemInform, 2012
Oxidation of secondary amines to nitrones using magnetically separable tungstophosphoric acid supported on silica-encapsulated γ-Fe2O3 nanoparticles
Tetrahedron Letters, 2013
Phosphoric acid supported on alumina (H3PO4/Al2O3) as an efficient and reusable catalyst for the one-pot synthesis of benzoxanthene pigments
Research on Chemical Intermediates, 2014
An efficient synthesis of 1-thioamidoalkyl-2-naphthol derivatives
Research on Chemical Intermediates, 2013
Mild, four-component synthesis of 6-amino-4-aryl-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles catalyzed by titanium dioxide nano-sized particles
Research on Chemical Intermediates, 2014
Mild and efficient silylation of alcohols under ambient and solvent-free conditions with phosphorus pentoxide supported on alumina (P2O5/Al2O3) as catalyst
Research on Chemical Intermediates, 2013
Novel Magnetically Separable Sulfated Boric Acid Functionalized Nanoparticles for Hantzsch Ester Synthesis
Synlett, 2016
ChemInform Abstract: A Catalyst-Free Synthesis of α-Aminophosphonates in Glycerol
ChemInform, 2015
ABSTRACT
Encapsulation of Pd(II) into superparamagnetic nanoparticles grafted with EDTA and their catalytic activity towards reduction of nitroarenes and Suzuki-Miyaura coupling
Applied Organometallic Chemistry, 2015
ABSTRACT
Tetrahedron Letters, 2014
ChemInform, 2014
Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as ... more Superparamagnetic tungstophosphoric acid supported on silica-encapsulated c-Fe 2 O 3 was used as an efficient catalyst for the direct oxidation of secondary amines to nitrones with hydrogen peroxide as the oxidant. The catalyst could be recycled up to four times without significant loss of activity.
Direct oxidative amidation of benzyl alcohols using EDTA@Cu(II) functionalized superparamagnetic nanoparticles
Applied Catalysis A: General, 2014
ABSTRACT
Vitamin B1 supported on silica-encapsulated γ-Fe2O3 nanoparticles: design, characterization and application as a greener biocatalyst for highly efficient acylation
RSC Advances, 2014
ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hy... more ABSTRACT A new magnetic catalyst was synthesized by the immobilization of vitamin B1 (thiamine hydrochloride) on the surface of silica-encapsulated γ-Fe2O3 nanoparticles. Its capability was evaluated in the acylation of alcohols and phenols with acetic anhydride under solvent-free conditions and afforded the desired products in high yield. This novel magnetic organocatalyst could be separated from the reaction vessel by use of an external magnet and recovered 5 times without a significant loss of its activity. The amount of loaded vitamin B1 on the silica-encapsulated γ-Fe2O3 was assigned by TGA and confirmed by back titration. Availability, cheapness and low toxicity are reasons associated with the utilization of vitamin B1 as a catalyst. The catalyst has been characterized by FT-IR, XRD, SEM, VSM and TG/DTA.
Oxidative coupling of formamides with β-dicarbonyl compounds and the synthesis of 2-aminobenzothiazole using Cu(II)-functionalized Fe3O4 nanoparticles
Tetrahedron Letters, 2015
ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-di... more ABSTRACT The Fe3O4@EDTA–Cu(II) nanoparticles catalyzed oxidative coupling of formamides with β-dicarbonyl compounds is developed using tert-butyl hydroperoxide as an oxidant. In general, the enol carbamates are synthesized in excellent yields (up to 92%) under the optimized reaction conditions. Fe3O4@EDTA–Cu(II) has the advantage of being magnetically recoverable. Also, we have established a highly efficient Fe3O4@EDTA–Cu(II)-catalyzed tandem reaction of 2-iodoanilines with isothiocyanates for the synthesis of 2-aminobenzothiazoles.
Phosphoric acid supported on alumina: A useful and effective heterogeneous catalyst in the preparation of α-amidoalkyl-β-naphthols, α-carbamato-alkyl-β–naphthols, and 2-arylbenzothiazoles
Arabian Journal of Chemistry, 2012
ABSTRACT
Ultrasound irradiation for the green synthesis of chromenes using l -arginine-functionalized magnetic nanoparticles as a recyclable organocatalyst
RSC Adv., 2014
ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a serie... more ABSTRACT A practical, convenient, and cheap methodology is developed for the synthesis of a series of chromene derivatives via cyclocondensation of β-naphthole, malononitrile and aromatic aldehydes, in the presence of arginine-immobilized magnetic nanoparticles, under ultrasound irradiation, in high yields. This catalyst can be easily separated from the reaction by external magnet and recycled four times without its activity loss. This methodology has shown shorter reaction times when compared with conventional thermal heating.
ChemInform Abstract: Efficient Multi-Component Synthesis of Highly Substituted Imidazoles Utilizing P 2 O 5 /SiO 2 as a Reusable Catalyst
ChemInform, 2011
ABSTRACT
Protection of Carbonyl Compounds as Diacetals Using P2O5/SiO2 and P2O5/Al2O3 as Catalysts
Chemical Science Transactions, 2012
Three-Component Synthesis of α-Amidoalkyl-β-naphthols and α-Carbamato-alkyl-β–naphthols Catalyzed by P2O5/SiO2
Chemical Science Transactions, 2012
... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, ... more ... HAMID REZA SHATERIAN*, KOBRA AZIZI and NAFISEH FAHIMI ... 122.2, 122.3, 122.5, 125.6, 126.0, 128.1 (2C), 128.2 (2C), 128.3, 128.4, 132.2, 141.8, 153.0, 168.5 ppm; IR (KBr, cm-1): 3421, 3230, 2922, 1638, 1516, 1438, 1334, 810, 741; MS (EI, 70 eV) m/z (%) = 319 (M+, 28 ...
A catalyst-free synthesis of α-aminophosphonates in glycerol
Tetrahedron Letters, 2014
ABSTRACT
ChemInform Abstract: Selective Synthesis of 2-Aryl-1-benzylated-1H-benzimidazoles
ChemInform, 2012
Oxidation of secondary amines to nitrones using magnetically separable tungstophosphoric acid supported on silica-encapsulated γ-Fe2O3 nanoparticles
Tetrahedron Letters, 2013
Phosphoric acid supported on alumina (H3PO4/Al2O3) as an efficient and reusable catalyst for the one-pot synthesis of benzoxanthene pigments
Research on Chemical Intermediates, 2014
An efficient synthesis of 1-thioamidoalkyl-2-naphthol derivatives
Research on Chemical Intermediates, 2013
Mild, four-component synthesis of 6-amino-4-aryl-3-methyl-1,4-dihydropyrano[2,3-c]pyrazole-5-carbonitriles catalyzed by titanium dioxide nano-sized particles
Research on Chemical Intermediates, 2014
Mild and efficient silylation of alcohols under ambient and solvent-free conditions with phosphorus pentoxide supported on alumina (P2O5/Al2O3) as catalyst
Research on Chemical Intermediates, 2013