Design, synthesis and evaluation of novel quinazoline-2,4-dione derivatives as chitin synthase inhibitors and antifungal agents.

Abstract:

:A series of novel 1-methyl-3-substituted quinazoline-2,4-dione derivatives were designed, synthesized, and characterized by (1)H NMR, (13)C NMR and MS spectral data. Their inhibition against chitin synthase (CHS) and antifungal activities were evaluated in vitro. Results showed compounds 5b, 5c, 5e, 5f, 5j, 5k, 5l, and 5o had strong inhibitory potency against CHS. Compound 5c, which has the highest potency among these compounds, had a half-inhibition concentration (IC50) of 0.08mmol/L, while polyoxin B as positive drug had IC50 of 0.18mmol/L. These IC50 values of compounds 5i, 5m, 5n, and 5s were greater than 0.75mmol/L, which revealed that those compounds had weak inhibition activity against CHS. Moreover, most of these compounds exhibited moderate to excellent antifungal activities. In detail, to Candida albicans, the activities of compound 5g and 5k were 8-fold stronger than that of fluconazole and 4-fold stronger than that of polyoxin B; to Aspergillus flavus, the activities of 5g, 5l and 5o were16-fold stronger than that of fluconazole and 8-fold stronger than that of polyoxin B; to Cryptococcus neoformans, the minimum-inhibition-concentration (MIC) values of compounds 5c, 5d, 5e and 5l were comparable to those of fluconazole and polyoxin B. The antifungal activities of these compounds were positively correlated to their IC50 values against CHS. Furthermore, these compounds had negligible actions to bacteria. Therefore, these compounds were promising selective antifungal agents.

journal_name

Bioorg Med Chem

authors

Ji Q,Yang D,Wang X,Chen C,Deng Q,Ge Z,Yuan L,Yang X,Liao F

doi

10.1016/j.bmc.2014.04.042

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

3405-13

issue

13

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(14)00307-1

journal_volume

22

pub_type

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