WELPSA: A natural catalyst of alkali and alkaline earth metals for the facile synthesis of tetrahydrobenzobpyrans and pyrano2,3-dpyrimidinones as inhibitors of SARS-CoV-2

Nesaragi, AR and Kamble, RR and Hoolageri, SR and Mavazzan, A and Madar, SF and Anand, A and Joshi, SD (2021) WELPSA: A natural catalyst of alkali and alkaline earth metals for the facile synthesis of tetrahydrobenzobpyrans and pyrano2,3-dpyrimidinones as inhibitors of SARS-CoV-2. In: Applied Organometallic Chemistry .

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Abstract

Since 2019, the infection of SARS-CoV-2 has been spreading worldwide and caused potentially lethal health problems. In view of this, the present study explores the most commodious and environmentally benign synthetic protocol for the synthesis of tetrahydrobenzobpyran and pyrano2,3-dpyrimidinones as SARS-CoV-2 inhibitors via three-component cycloaddition of aromatic aldehyde, malononitrile, and dimedone/barbituric acid in water. Lemon peel from juice factory waste, namely, lemon (Citrus limon), sweet lemon (C. limetta), and Kaffir lime or Citron (C. hystrix), effectually utilized to obtain WELPSA, WESLPSA, and WEKLPSA, respectively, for the synthesis of title compounds. The catalyst was characterized by scanning electron microscope (SEM) and energy-dispersive x-ray spectroscopy (EDX). The concentration of sodium, potassium, calcium, and magnesium in the catalyst (WELPSA) was determined using atomic absorption spectrometry (AAS). The current approach manifests numerous notable advantages that include ease of preparation, handling and benignity of the catalyst, low cost, green reaction conditions, facile workup, excellent yields (93%�97%) with extreme purity, and recyclability of the catalyst. Compounds were docked on the crystal structure of SARS-CoV-2 (PDB: 6M3M). The consensus score obtained in the range 2.47�4.63 suggests that docking study was optimistic indicating the summary of all forces of interaction between ligands and the protein. © 2021 John Wiley & Sons, Ltd.

Item Type:	Journal Article
Publication:	Applied Organometallic Chemistry
Publisher:	John Wiley and Sons Ltd
Additional Information:	The copyright for this article belongs to John Wiley & Sons, Ltd.
Keywords:	Absorption spectroscopy; Atomic absorption spectrometry; Catalysts; Citrus fruits; Crystal structure; Energy dispersive spectroscopy; Lime; Scanning electron microscopy, Alkali earth metal; Alkaline-earth metals; Atomic-absorption spectrometry; Covid-19; Environmentally benign; Facile synthesis; Pyrano2,3-dpyrimidinone; Tetrahydrobenzobpyran; WELPSA; + catalyst, SARS
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	26 Nov 2021 10:46
Last Modified:	26 Nov 2021 10:46
URI:	http://eprints.iisc.ac.in/id/eprint/70466

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