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A series of oxadiazole derivatives possessing morpholine 6a–l were synthesized by nucleophilic substitution reaction of key intermediates [1,3,4]-oxadiazole-2-thiol derivatives 5a–l with 4-(2-chloroethyl) morpholine. Compounds 6a–l were evaluated for their in vitro and in vivo antitumor potential in Dalton’s Lymphoma Ascites (DLA) tumor cells. Among 6a–l series, compound 6a with concentration ∼8.5 μM have shown extensive cytotoxicity in vitro and 85% reduction in tumor volume in vivo, attributing an excellent anti-proliferative capability towards the cancer cells. Compound 6a has extensively inhibited the Microvessel Density (MVD) or tumoral neovasculature which was evident from the CD31 immuno staining and peritoneal H&E staining. The major reason for the antiproliferative activity of compound 6a was due to the repression of tumor vasculature.