Zn-VCO3 hydrotalcite: A highly efficient and reusable heterogeneous catalyst for the Hantzsch dihydropyridine reaction

Pagadala, Ramakanth; Maddila, Suresh; Dasireddy, Venkata D.B.C.; Jonnalagadda, Sreekantha B.

doi:10.1016/j.catcom.2013.11.012

Cited by 64 publications

(26 citation statements)

References 32 publications

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“…43 The FT-IR spectrum of nano-g-Fe 2 O 3 -CPTES (Fig. 22 Compared with the spectrum of nano-g-Fe 2 O 3 -IM, the nanog-Fe 2 O 3 -IM tribromide exhibits a characteristic broad band in the region 991.5-1120 cm À1 . 44 The IR spectra of nano-g-Fe 2 O 3 -IM and nano-g-Fe 2 O 3 -IM tribromide ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Magnetic nanoparticle-supported imidazole tribromide: a green, mild, recyclable and metal-free catalyst for the oxidation of sulfides to sulfoxides in the presence of aqueous hydrogen peroxide

et al. 2015

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Imidazole tribromide immobilized on magnetic nanoparticles as a bromine source was prepared and characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) techniques. The high catalytic activity of this novel catalyst was investigated in the oxidation of sulfides to sulfoxides using aqueous hydrogen peroxide as an oxidant at room temperature under solvent-free conditions. More importantly, the catalyst could be easily recovered by an external magnet and reused five times without any significant loss of catalytic activity.

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Section: Resultsmentioning

confidence: 99%

Magnetic nanoparticle-supported imidazole tribromide: a green, mild, recyclable and metal-free catalyst for the oxidation of sulfides to sulfoxides in the presence of aqueous hydrogen peroxide

et al. 2015

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“…In continuation of our interest in the environmental friendly protocols for the various syntheses of heterocyclic derivatives with better yields [46][47][48][49], we herein report the one-pot reaction of ethylacetoacetate, hydroxyl amine and substituted aldehydes in the presence of a catalyst Ag/SiO 2 for the synthesis of isoxazole derivatives in excellent yields.…”

Section: Introductionmentioning

confidence: 99%

Ag/SiO2 as a recyclable catalyst for the facile green synthesis of 3-methyl-4-(phenyl)methylene-isoxazole-5(4H)-ones

2015

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An efficient and facile green method for synthesis of 3-methyl-4-(phenyl)methylene-isoxazole-5(4H)-one (4a-m) via room temperature reaction of hydroxylamine, ethylacetoacetate and substituted aromatic aldehydes is designed, using Ag/SiO 2 as catalyst with water as solvent. This protocol offers several advantages, such as it being a benign, energy conserving and eco-friendly reaction with products obtained in excellent yields (88-93 %). The reaction requires relatively short reaction times (\1 h), a simple workup procedure with good atom efficiency and easily recoverable catalyst. The heterogeneous catalyst, Ag/SiO 2 , was fully characterized and is reusable without loss of activity for up to seven cycles with marginal activity loss. Graphical AbstractN O O CH 3 OEt O O NH 2 OH.HCl CHO R R Ag/SiO 2 H 2 O / R.T, 1h 4a-m Electronic supplementary material The online version of this article (

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“…Because of this, zinc does not have a distinct redox chemistry compared to other transition metals; mainly Zn(0) and Zn(II) are known. Utilising its properties, we prepared Zn‐VCO 3 hydrotalcite as a catalyst for Hantzsch dihydropyridine reaction. The catalyst was prepared by co‐precipitation method, and the prepared catalyst was calcined at 500 °C for 4 h. It was employed for the synthesis of 6 novel dihydropyridines by reacting the benzaldehydes, acetoacetanilide, ammonium hydroxide and 20 mg of Zn−V hydrotalcite in water and heated to 60 °C.…”

Section: Hydrotalcite Supported Mixed Oxidesmentioning

confidence: 99%

“… Hantzsch dihydropyridine reaction pathway. Source: Reprinted from with permission from Catalysis Communications.…”

Section: Hydrotalcite Supported Mixed Oxidesmentioning

confidence: 99%

Our Contributions in Synthesis of Diverse Heterocyclic Scaffolds by Using Mixed Oxides as Heterogeneous Catalysts

Bhaskaruni

Gangu

Maddila

et al. 2018

The Chemical Record

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This personal account mainly introduces and reviews our recent contributions in developing different catalyst materials involving mixed oxides and their scope as renewable catalysts in multicomponent reactions to synthesize various novel heterocyclic scaffolds under green conditions. The application of various mixed oxides and their composites in the organic synthesis is emphasized through this review, in order to reveal the versatility, scope and importance of mixed oxides and their interactions during the reaction. We have also briefed the limitations of mixed oxides as catalysts, to put forward the broader prospective in the field.

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Zn-VCO3 hydrotalcite: A highly efficient and reusable heterogeneous catalyst for the Hantzsch dihydropyridine reaction

Cited by 64 publications

References 32 publications

Magnetic nanoparticle-supported imidazole tribromide: a green, mild, recyclable and metal-free catalyst for the oxidation of sulfides to sulfoxides in the presence of aqueous hydrogen peroxide

Magnetic nanoparticle-supported imidazole tribromide: a green, mild, recyclable and metal-free catalyst for the oxidation of sulfides to sulfoxides in the presence of aqueous hydrogen peroxide

Ag/SiO2 as a recyclable catalyst for the facile green synthesis of 3-methyl-4-(phenyl)methylene-isoxazole-5(4H)-ones

Our Contributions in Synthesis of Diverse Heterocyclic Scaffolds by Using Mixed Oxides as Heterogeneous Catalysts

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