Synthesis and antimicrobial activities of novel quinazolin-4(3H)-one derivatives containing a 1,2,4-triazolo[3,4-b][1,3,4]thiadiazole moiety

A series of novel quinazolin-4(3H)-one derivatives (6a–6y) containing a 1,2,4-triazolo[3,4-b][1,3,4]thiadiazole moiety were designed and synthesized, and their structures were fully characterized by 1H NMR, 13C NMR, HRMS and IR spectra. Among them, the structure of compound 6u was unambiguously conf...

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Bibliographic Details
Published in:Journal of Saudi Chemical Society 2018-01, Vol.22 (1), p.101-109
Main Authors: Lv, Xinyang, Yang, Lan, Fan, Zhijiang, Bao, Xiaoping
Format: Article
Language:English
Subjects:
1,2,4-Triazolo[3,4-b][1,3,4]thiadiazole
Antibacterial activity
Quinazolin-4(3H)-one
Synthesis
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Summary:A series of novel quinazolin-4(3H)-one derivatives (6a–6y) containing a 1,2,4-triazolo[3,4-b][1,3,4]thiadiazole moiety were designed and synthesized, and their structures were fully characterized by 1H NMR, 13C NMR, HRMS and IR spectra. Among them, the structure of compound 6u was unambiguously confirmed via single crystal X-ray diffraction analysis. The obtained bioassay results showed that compounds 6h, 6k, 6l and 6y had the EC50 (half-maximal effective concentration) values of 34.8, 28.2, 41.5 and 42.5μg/mL against the phytopathogenic bacterium Xanthomonas oryzae pv. oryzae (Xoo), respectively, which were significantly better than commercial bactericide Bismerthiazol (EC50=95.8μg/mL). Additionally, compounds 6a and 6b exhibited the strong inhibition activity against the pathogen Xanthomonas axonopodis pv. citri (Xac).
ISSN:1319-6103
DOI:10.1016/j.jscs.2017.07.008