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A series of novel hybrid molecules based on disulfides and 1,2,4-triazole were synthesized, and the structures of the resulting compounds ( 7a – 7g ,  8a – 8g  and  9a – 9g ) were confirmed by their IR,  1 H NMR,  13 C NMR and HR-ESI-MS spectroscopic data. The in vitro antiproliferative activity of the tested compounds on human cancer cells A549, Hela, SMMC-7721, and normal cells L929 was determined by CCK-8 assay. The obtained data revealed that most of the tested compounds showed some degrees of antiproliferative activity, and some compounds displayed better effects than positive control 5-FU against various cancer cells. Especially, 3-phenyl-5-(n- butyldisulfanyl)-1,2,4-triazole 7c exhibited highly effective antitumor activity against A549 cells with IC 50  value of 3.55 μM. 3-(4-methoxyphenyl)-5-(n-hexyldisulfanyl) −1,2,4-triazole  9 g  was found to have the best inhibitory effect on Hela cells with IC 50  value of 3.46 μM. 3-phenyl-5-(2-butyldisulfanyl)-1,2,4-triazole 7e showed the greatest inhibitory activity on SMMC-7721 cells with IC 50  value of 1.08 μM. In addition, all compounds exhibited weaker cytotoxic effects than 5-FU on L929 cells.

Novel hybrid molecules based on disulfides and 1,2,4-triazole as antiproliferative agents