Design, Synthesis and Biological Activities of Compounds Containing 1,3,4-Oxadiazole or 1,3,4-Thiadiazole

In order to fmd new anti-tumor drugs, a series of novel 1,3,4-oxadiazole and 1,3,4-thiadiazole derivatives were designed and synthesized. The target compounds were evaluated for antitumor activity in vitro on four human cancer cell lines including B-16 (skin melanoma cells), PC-3 (human prostate cancer cells), U87 (human primary glioblastoma cells) and A549 (human non-small cell lung cancer cells). The results displayed that some of the compounds had good activities, especially, 5-((6-(4-(2-hydroxyethyl)piperazin-1-yl)-2-methylpyrimidin-4-yl)amino)-N-(2-methoxyphenyl)-1,3,4-thiadiazole-2-carboxamide (8b) and 54(6-(4-(2-hydroxyethyl)piperaz in-1-yl)-2-methyl)pyrimidin-4-yl)amino)-N-(4-methoxy phenyl)-1,3,4-thiadiazole-2-carboxamide (8c) showed high antitumor activities against four cancer cell lines, which was better than dasatinib. These compounds were further studied for their possible target of tumor suppression.