Lewis Acid Promoted, One-Pot Synthesis of Fluoroquinolone Clubbed 1,3,4-Thiadiazole Motifs under Microwave Irradiation: Their Biological Activities

Author(s): Navin B. Patel*, Rahul B. Parmar, Hetal I. Soni

Journal Name: Current Microwave Chemistry

Volume 7 , Issue 1 , 2020

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Graphical Abstract:


Background: A Lewis acid promoted efficient and facile procedure for one-pot synthesis of a novel series of fluoroquinolone clubbed with thiadiazoles motifs under microwave irradiation is described here. This technique has more advantages such as high yield, a clean procedure, low reaction time, simple work-up and use of Lewis acid catalyst.

Objective: Our aim is to generate a biologically active 1,3,4- thiadiazole ring system by using a onepot synthesis method and microwave-assisted heating. High yield and low reaction time were the main purposes to synthesize bioactive fluoroquinolone clubbed 1,3,4- thiadiazole moiety.

Methods: Fluoroquinolone Clubbed 1,3,4-Thiadiazole Motifs was prepared by Lewis acid promoted, one-pot synthesis, under microwave irradiation. All the synthesized molecules were determined by IR, 1H NMR, 13C NMR, and Mass spectra. The antimicrobial activity of synthesized compounds was examined against two Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa), two Gram-positive bacteria (Staphylococcus aureus, Streptococcus pyogenes), and three fungi (Candida albicans, Aspergillus niger, Aspergillus clavatus) using the MIC (Minimal Inhibitory Concentration) method and antitubercular activity H37Rv using L. J. Slope Method.

Results: Lewis acid promoted, one-pot synthesis of Fluoroquinolone clubbed 1,3,4-Thiadiazole motifs under microwave irradiation is an extremely beneficial method because of its low reaction time and good yield. Some of these novel derivatives showed moderate to good in vitro antibacterial, antifungal, and antitubercular activity.

Conclusion: One-pot synthesis of 1,3,4-Thiadiazole by using Lewis acid catalyst gives a good result for saving time and also getting more production of novel heterocyclic compounds with good antimicrobial properties via microwave heating method.

Keywords: Fluoroquinolone, 1, 3, 4- thiadiazole, antimicrobial activity, M. tuberculosis H37Rv, microwave irradiation, one-pot synthesis.

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Article Details

Year: 2020
Published on: 22 June, 2020
Page: [60 - 66]
Pages: 7
DOI: 10.2174/2213335606666191016111642

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