A series of 30 small hybrid molecules are synthesized inspired from Combretastatin A-4 (CA-4), where ethylene-bridge of CA-4 is replaced with two five-membered heterocyclic rings, viz. isoxazoline and 1, 2, 3-triazole. These are joined by a methylene linker, with substitutions at A and Bring position of CA-4. The new molecular entities have shown significant cytotoxicity to cancer cell from the IC 50 0.49 μM-3.17 μM with 1-((4,5-Dihydro-3-(2,5-dimethoxyphenyl)isoxazol-5-yl)methyl)-4-(4-methoxyphenyl)-1H-1,2,3-triazole displayed IC 50 0.422 � 0.07 μM for A-549-lung cancer cell line and IC 50 0.498 � 0.03 μM for MDA-MB-231-breast cancer cell line. The western blot analysis, confocal staining and also by in vitro tubulin polymerization assay established the target specificity of the molecules as a tubulin polymerization inhibitor. Molecular docking & Molecular dynamics studies confirmed the binding interaction patterns of these molecules at the Colchicine binding site of tubulin and have correlated the observed experimental result with variation in structure satisfactorily.

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