Polyaniline/SiO<sub>2</sub> Nanocomposite Catalyzed Efficient Synthesis of Quinoxaline Derivatives at Room Temperature

Yelwande, Ajeet A.; Navgire, Madhukar E.; Arbad, Balasaheb R.; Lande, Machhindra K.

doi:10.1002/jccs.201100482

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…According to Yelwande et al [47] the polyaniline/SiO 2 catalysed technique has been found to be an effective and rapid precursor for the fabrication of quinoxaline derivative 106 by cyclocondensation of 1,2-diketones 104 and o-phenylenediamines 105 at room temperature. The catalyst's reusability was tested across three runs and it was discovered that the catalyst retains its activity even after the third run (Scheme 39, Table 26).…”

Section: Chemistryselectmentioning

confidence: 99%

Reusable Nano Catalysed Synthesis of Heterocycles: An Overview

Sonawane¹,

Deore²,

Chavan

2022

ChemistrySelect

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The field of reusable nano‐catalysts has grown rapidly over the last decade. Recently, transition metal catalysed organic reactions have attracted considerable interest from the pharmaceutical and organic chemistry fields. Synthetic procedures based on such heterogeneous nanocatalysts are easier, less expensive, non‐toxic, and eco‐friendly, producing only the most desirable products in higher yields and allowing for easy catalyst separation. Heterogeneous nano‐catalysts were highly preferred over homogeneous catalysts for the synthesis of heterocyclic compounds due to their effective separation processes for both products and catalysts. According to recent studies, nanoparticles (NPs) are commonly used as a heterogeneous catalyst in the production of heterocyclic compounds. Heterogeneous catalysts are widely used in a variety of organic reactions due to their high surface‐to‐volume ratio. Most importantly, after the reaction is complete, easy magnetic separation of the catalyst minimises the requirement for catalyst filtration. Additionally, magnetic NPs, particularly supported magnetic nanocatalysts, have garnered considerable interest in both academic and industrial research due to their effectiveness as alternatives to traditional materials, their ease of separation via an external magnet, and their high degree of chemical stability in a variety of organic and inorganic solvents. To reach its depth, this review is focused on the most recent examples, their preparation, synthetic strategies and recycling studies of highly excited catalytic systems used for the synthesis of heterocyclic compounds.

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Section: Chemistryselectmentioning

confidence: 99%

Reusable Nano Catalysed Synthesis of Heterocycles: An Overview

Sonawane¹,

Deore²,

Chavan

2022

ChemistrySelect

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“…Polyaniline/SiO 2 nanocomposite material was prepared and it was used as a catalyst for the synthesis of quinoxalines. They reported that 10% catalyst was found to be optimal for the reactant transformation, and the catalyst activity was found to be consistent even after three runs [36]. Another popular method to synthesize quinoxalines is by using TiO 2 nanoparticles as a catalyst.…”

Section: Application Of Nanoparticles In Organic Synthesismentioning

confidence: 99%

Function of Nanocatalyst in Chemistry of Organic Compounds Revolution: An Overview

Hemalatha

Madhumitha

Kajbafvala

et al. 2013

Journal of Nanomaterials

103

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Heterocyclic motif is an important scaffold which has both industrial and pharmaceutical applications. These motifs can be prepared using wide variety of reaction conditions such as the use of expensive catalyst, toxic solvent, harsh reaction condition like the use of base, high temperature, and multistep reaction. Although various methods are involved, the chemistry arena is now shifted towards the greener way of synthesis. Nanocatalyst constitutes an important role in the green synthesis. This is because the activity of the catalyst resides in the exposed portion of the particles. By decreasing the size of the catalyst, advantages such as more surface area would be exposed to the reactant, only negligible amount would be required to give the significant result and selectivity could be achieved, thereby, eliminating the undesired products. The current review enlists the various types of nanocatalyst involved in the heterocyclic ring formation and also some other important functionalization over the ring.

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“…In continuation of our interest towards the development of new heterogeneous catalyst for the synthesis of bioactive heterocyclic [55][56][57][58][59][60][61], herein we wish to report for the first time a simple, non-toxic and efficient methodology for the synthesis of 3,4-dihydropyrimidin-2(1H)ones in moderate to good yields by the reaction of benzaldehydes, β-ketoesters and urea/ thiourea using polyaniline/SiO2 as catalyst (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

Polyaniline/SiO2 Nanocomposite Catalyzed One-pot Three Component Synthesis of 3,4-dihydropyrimidin-2(1H)-one Derivatives

Yelwande,

Navgire,

Tayde

et al. 2024

Preprint

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An efficient and rapid protocol for the synthesis of one-pot 3,4-dihydropyrimidin-2(1H)-ones has been developed by the polyaniline/SiO2 catalyzed condensation of benzaldehydes, β-ketoesters and urea/ thiourea. Polyaniline/SiO2 nanocomposite was synthesized by chemical oxidative polymerization of aniline monomer on the surface of SiO2 in the presence potassium persulphate (K2S2O8) as oxidizing agent and sulfuric acid (H2SO4).The synthesized catalytic materials have been well characterized by means of transmission electron microscopy (TEM), thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Temperature programmed desorption (NH3-TPD) and Brunauer Emmett and Teller (BET) method. Solvent stability of catalyst was tested using UV-Visible spectroscopy. Thermal stability of Polyaniline is noticeably improved which may due to the insertion of polyaniline on the surface of SiO2. NH3-TPD was used to determine the acidic properties of solid catalyst Polyaniline/SiO2 indicate the weak, medium and strong acidic sites total acidic strength is found to be 0.2906 mmol/gm. The specific surface area and average pore diameter of 10 wt % polyaniline/SiO2 are found 75.3443 m²/g and 10.8823 nm. This protocol has several advantages such as good thermal stability, high yield, simple work up procedure, non-toxic, clean, and easy recovery and reusability of the catalyst system.

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Polyaniline/SiO₂ Nanocomposite Catalyzed Efficient Synthesis of Quinoxaline Derivatives at Room Temperature

Cited by 11 publications

References 35 publications

Reusable Nano Catalysed Synthesis of Heterocycles: An Overview

Reusable Nano Catalysed Synthesis of Heterocycles: An Overview

Function of Nanocatalyst in Chemistry of Organic Compounds Revolution: An Overview

Polyaniline/SiO2 Nanocomposite Catalyzed One-pot Three Component Synthesis of 3,4-dihydropyrimidin-2(1H)-one Derivatives

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Polyaniline/SiO2 Nanocomposite Catalyzed Efficient Synthesis of Quinoxaline Derivatives at Room Temperature

Cited by 11 publications

References 35 publications

Reusable Nano Catalysed Synthesis of Heterocycles: An Overview

Reusable Nano Catalysed Synthesis of Heterocycles: An Overview

Function of Nanocatalyst in Chemistry of Organic Compounds Revolution: An Overview

Polyaniline/SiO2 Nanocomposite Catalyzed One-pot Three Component Synthesis of 3,4-dihydropyrimidin-2(1H)-one Derivatives

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Polyaniline/SiO₂ Nanocomposite Catalyzed Efficient Synthesis of Quinoxaline Derivatives at Room Temperature