Author
Ajay Gupta
Other affiliations: St. Joseph's College, Bangalore
Bio: Ajay Gupta is an academic researcher from North Eastern Hill University. The author has contributed to research in topics: Catalysis & Superparamagnetism. The author has an hindex of 8, co-authored 16 publications receiving 183 citations. Previous affiliations of Ajay Gupta include St. Joseph's College, Bangalore.
Topics: Catalysis, Superparamagnetism, Oxide, Copper oxide, Coupling reaction
Papers
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03 Jul 2018
TL;DR: An efficient, green, and sustainable synthesis of new hybrid molecules containing flavanone with triazole by merging the Michael addition and Click reaction using a copper oxide/reduced graphene oxide nanocomposite in one pot is reported.
Abstract: An efficient, green, and sustainable synthesis of new hybrid molecules containing flavanone with triazole by merging the Michael addition and Click reaction using a copper oxide/reduced graphene oxide nanocomposite in one pot is reported. The catalyst can easily be recycled and reused in seven consecutive runs without compromising the product yields. Other notable advantages include using water as a reaction medium and obtaining good to excellent yields, low catalyst loading, high atom efficiency, high substrate variation, and good results in the gram scale reaction.
59 citations
TL;DR: Graphite Oxide (GO), an attractive metal free carbocatalyst, was employed as a green and highly efficient catalytic system for the synthesis of 1,5-benzodiazepines as discussed by the authors.
39 citations
TL;DR: An efficient, highly product selective, eco-friendly, one-pot multicomponent synthesis of dihydropyrimidine derivatives via Biginelli reaction has been described in this paper, which was developed by greener nanoparticle-catalyzed organic synthesis enhancement (NOSE) chemistry and solvent free reaction condition (SFRC) approaches, which helped us in making the procedure greener.
25 citations
TL;DR: An efficient magnetically retrievable ferrite-supported glutathione nano-organocatalyst has been employed for the synthesis of a library of 2-amino-4H-pyran derivatives in aqueous media via a one-pot multicomponent reaction.
Abstract: An efficient magnetically retrievable ferrite-supported glutathione nano-organocatalyst has been employed for the synthesis of a library of 2-amino-4H-pyran derivatives in aqueous media via a one-pot multicomponent reaction. The highlight of this protocol lies in its operational simplicity, use of greener solvent, high yield within a very short period of time and reusability of the catalyst. This method provides an alternative greener approach for the synthesis of 2-amino-4H-pyran derivatives.
24 citations
TL;DR: In this paper, a glutathione grafted nano-organocatalyst (nano-FGT) was used as an efficient catalyst for the synthesis of spirooxindole derivatives.
Abstract: A glutathione grafted nano-organocatalyst (nano-FGT) was used as an efficient catalyst for the synthesis of spirooxindole derivatives. An aqueous medium, easy separation by an external magnet, efficient catalyst reusability, low catalyst loading, and column chromatography free separation of the product makes the present procedure green, sustainable and economically viable. The TON and TOF of the nanocatalyst reached 850 000 and 56 667 min−1 respectively.
22 citations
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TL;DR: The purpose of the current review article is to present a comprehensive understanding regarding pros and cons of graphene related nanocomposites and to find ways in order to improve the performance of nanocomPOSites with new designs.
212 citations
TL;DR: A comprehensive review of the field of recycling catalysis can be found in this paper, where the results of recycling studies performed with a wide range of soluble homogeneous and immobilized complexes as well as heterogeneous catalysts developed in recent years are collected and discussed.
179 citations
TL;DR: The use of mixed oxides is a well-appreciated approach in the fields of material science and synthesis, due to remarkable tunable surface properties such as acidic and basic characteristics, oxidation/reduction capabilities, and high agility of lattice oxygen, which makes them ideal choices as heterogeneous catalysts.
75 citations
TL;DR: Based on their minimal inhibitory concentrations (MICs) against selected microorganisms, six out of twenty-six compounds showed significant antibacterial activity towards Enterococcus faecalis and the synthesized triazoles show relatively low toxicity against human erythrocytes.
Abstract: A new series of coumarin-1,2,3-triazole conjugates with varied alkyl, phenyl and heterocycle moieties at C-4 of the triazole nucleus were synthesized using a copper(I)-catalysed Huisgen 1,3-dipolar cycloaddition reaction of corresponding O-propargylated coumarin (3) or N-propargylated coumarin (6) with alkyl or aryl azides. Based on their minimal inhibitory concentrations (MICs) against selected microorganisms, six out of twenty-six compounds showed significant antibacterial activity towards Enterococcus faecalis (MIC = 12.5–50 µg/mL). Moreover, the synthesized triazoles show relatively low toxicity against human erythrocytes.
74 citations