Synthesis and antitumor evaluation of novel fused heterocyclic 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole derivatives
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In this study, twenty three 3,6-disubstituted 1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole derivatives were synthesized and their antiproliferative activities in vitro were studied against SMMC-7721, HeLa, A549, and L929 by the CCK-8 assay. The bioassay results demonstrated that all tested compounds 8(a–w) exhibited antiproliferation with different degrees, and some compounds showed better effects than reference drug 5-fluorouracil. Among these screened compounds, compounds 8a, 8d, and 8l displayed significant antitumor activities in inhibiting SMMC-7721cell proliferation with IC50 values of 1.64, 1.74, and 1.61 µM, respectively. Compounds 8d and 8l were manifested highly effective biological activity versus HeLa cells with IC50 values of 2.23 and 2.84 µM, respectively. Compound 8l was found to have the highest antitumor potency against A549 cells with IC50 value of 2.67 µM. Furthermore, all compounds exhibited weaker cytotoxic effects than 5-fluorouracil on normal cell lines L929.
KeywordsTriazolo-thiadiazole Disulfides Antitumor activity
We are grateful to the Tianjin Municipal Natural Science Foundation (18JCYBJC94900) and Training Project of Innovation Team of Colleges and Universities in Tianjin (TD13-5020) for financial support.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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