Synthesis and Biological Evaluation of N-(5-(pyridin-2-yl)-1,3,4-thiadiazol- 2-yl)benzamide Derivatives as Lipoxygenase Inhibitor with Potential Anticancer Activity

In the recent years, the role of LOX enzymes in the origin of neoplastic diseases such as colorectal, skin, pancreatic and renal cancers has been confirmed. A new series of 1,3,4-thiadiazole derivatives bearing 2-pyridyl moiety was synthesized and the cytotoxicity of the members of this series was assessed using MTT protocol. Enzyme inhibitory activity of the prepared compounds was also tested against 15-lipoxygenase-1 as a novel target for the discovery of anticancer drugs. PC3, HT29 and SKNMC cell lines were utilized and the obtained results were compared with doxorubicin. Overall, nitro containing derivatives exerted a higher cytotoxic activity against PC3 cell line and methoxylated derivatives showed an acceptable activity against SKNMC cell line. Methoxylated derivatives were also the most potent enzyme inhibitors especially at position ortho of the phenyl residue.