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Licensed Unlicensed Requires Authentication Published by De Gruyter April 26, 2021

Synthesis, antioxidant, antimicrobial and antiviral docking studies of ethyl 2-(2-(arylidene)hydrazinyl)thiazole-4-carboxylates

  • Muhammad Haroon , Tashfeen Akhtar EMAIL logo , Muhammad Khalid , Shehbaz Ali ORCID logo , Saniya Zahra , Ihsan ul haq , Muhanad Alhujaily , Mabilly C. H. de B. Dias , Ana Cristina Lima Leite and Shabbir Muhammad ORCID logo EMAIL logo

Abstract

A series of ethyl 2-(2-(arylidene)hydrazinyl)thiazole-4-carboxylates (2a–r) was synthesized in two steps from thiosemicarbazones (1a–r), which were cyclized with ethyl bromopyruvate to ethyl 2-(2-(arylidene)hydrazinyl)thiazole-4-carboxylates (2a–r). The structures of compounds (2a–r) were established by FT-IR, 1H- and 13C-NMR. The structure of compound 2a was confirmed by HRMS. The compounds (2a–r) were then evaluated for their antimicrobial and antioxidant assays. The antioxidant studies revealed, ethyl 2-(2-(4-hydroxy-3-methoxybenzylidene)hydrazinyl)thiazole-4-carboxylate (2g) and ethyl 2-(2-(1-phenylethylidene)hydrazinyl)thiazole-4-carboxylate (2h) as promising antioxidant agents with %FRSA: 84.46 ± 0.13 and 74.50 ± 0.37, TAC: 269.08 ± 0.92 and 269.11 ± 0.61 and TRP: 272.34 ± 0.87 and 231.11 ± 0.67 μg AAE/mg dry weight of compound. Beside bioactivities, density functional theory (DFT) methods were used to study the electronic structure and properties of synthesized compounds (2a–m). The potential of synthesized compounds for possible antiviral targets is also predicted through molecular docking methods. The compounds 2e and 2h showed good binding affinities and inhibition constants to be considered as therapeutic target for Mpro protein of SARS-CoV-2 (COVID-19). The present in-depth analysis of synthesized compounds will put them under the spot light for practical applications as antioxidants and the modification in structural motif may open the way for COVID-19 drug.


Corresponding author: Tashfeen Akhtar, Department of Chemistry, Mirpur University of Science and Technology (MUST), 10250 Mirpur, AJK, Pakistan, E-mail: ; and Shabbir Muhammad, Department of Physics, College of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia, E-mail:

Funding source: University of Bisha

Award Identifier / Grant number: UB-COVID-12-1441

Funding source: King Khalid University

Award Identifier / Grant number: RGP.1/168/42

Acknowledgements

The author from University of Bisha Saudi Arabia extend his appreciation to the Deanship of Scientific Research at University of Bisha for funding this work through COVID-19 Initiative Project under Grant Number (UB-COVID-12-1441). The author Muhammad Haroon is thankful to HEC, Pakistan for six months IRSIP fellowship and Prof. Alan S. Goldman, Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, USA, for providing NMR facility. The author from King Khalid University of Saudi Arabia extends his appreciation to the Deanship of Scientific Research at King Khalid University for funding the work through Project (RGP.1/168/42). For computer time, this research used the resources of the Supercomputing Laboratory at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The author from University of Bisha Saudi Arabia extend his appreciation to the Deanship of Scientific Research at University of Bisha for funding this work through COVID-19 Initiative Project under Grant Number (UB-COVID-12-1441). The author from King Khalid University of Saudi Arabia extends his appreciation to the Deanship of Scientific Research at King Khalid University for funding the work through Project (RGP.1/168/42).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Supplementary material

The online version of this article offers supplementary material (https://doi.org/10.1515/znc-2021-0042).


Received: 2021-02-14
Accepted: 2021-04-09
Published Online: 2021-04-26
Published in Print: 2021-11-25

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