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Medicinal Chemistry

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ISSN (Print): 1573-4064
ISSN (Online): 1875-6638

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Research Article

Synthesis and Antioxidant Activity of New Selenium-Containing Quinolines

Author(s): Benedetta Bocchini, Bruna Goldani, Fernanda S.S. Sousa, Paloma T. Birmann, Cesar A. Brüning, Eder J. Lenardão, Claudio Santi, Lucielli Savegnago* and Diego Alves*

Volume 17, Issue 6, 2021

Published on: 03 April, 2020

Page: [667 - 676] Pages: 10

DOI: 10.2174/1573406416666200403081831

Price: $65

Abstract

Background: Quinoline derivatives have been attracted much attention in drug discovery, and synthetic derivatives of these scaffolds present a range of pharmacological activities. Therefore, organoselenium compounds are valuable scaffolds in organic synthesis because of their pharmacological activities and their use as versatile building blocks for regio-, chemo-and stereoselective reactions. Thus, the synthesis of selenium-containing quinolines has great significance, and their applicability range from simple antioxidant agents, to selective DNA-binding and photocleaving agents.

Objective: In the present study, we describe the synthesis and antioxidant activity in vitro of new 7- chloro-N(arylselanyl)quinolin-4-amines 5 by the reaction of 4,7-dichloroquinoline 4 with (arylselanyl)- amines 3.

Methods: For the synthesis of 7-chloro-N(arylselanyl)quinolin-4-amines 5, we performed the reaction of (arylselanyl)-amines 3 with 4,7-dichloroquinoline 4 in the presence of Et3N at 120 °C in a sealed tube. The antioxidant activities of the compounds 5 were evaluated by the following in vitro assays: 2,2- diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, 2,2-azinobis-3- ethylbenzothiazoline-6-sulfonic acid (ABTS), ferric ion reducing antioxidant power (FRAP), nitric oxide (NO) scavenging and superoxide dismutase-like activity (SOD-Like).

Results: 7-Chloro-N(arylselanyl)quinolin-4-amines 5a-d have been synthesized in yields ranging from 68% to 82% by the reaction of 4,7-dichloroquinoline 4 with arylselanyl-amines 3a-d using Et3N as a base, at 120 °C, in a sealed tube for 24 hours and tolerates different substituents, such as -OMe and -Cl, in the arylselanyl moiety. The obtained compounds 5a-d presented significant results concerning the antioxidant potential, which had an effect in the tests of inhibition of radical’s DPPH, ABTS+ and NO, as well as in the analysis that evaluates the capacity (FRAP) and in the superoxide dismutase-like activity assay (SOD-Like). It is worth mentioning that 7-chloro- N(arylselanyl)quinolin-4-amine 5b presented excellent results, demonstrating a better antioxidant capacity when compared to the others.

Conclusion: According to the obtained results, 7-chloro-N(arylselanyl)quinolin-4-amines 5 were synthesized in good yields by the reaction of 4,7-dichloroquinoline with arylselanyl-amines and tolerated different substituents in the arylselanyl moiety. The tested compounds presented significant antioxidant potential in the tests of inhibition of DPPH, ABTS+, and NO radicals, as well as in the FRAP and superoxide dismutase-like activity assays (SOD-Like).

Keywords: Synthesis, quinolines, selenium, amines, antioxidant, radicals.

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