Abstract
A series of novel 3,4-diaryl squaric acid analogs 4a–r related to combretastatin A-4 (CA4) using squaric acid as the cis-restricted linker were prepared and studied for their anticancer activity against selected human cancer cell lines. New compounds 4g, 4k, 4m, 4n, 4p, 4q and 4r exhibit strong activities against human leukemia cells with IC50 values of ≤20 nM and compounds 4k, 4n, 4p, 4q and 4r showed potent activities against a panel of human tumor cell lines. Compounds 4n and 4p arrest tumor cell cycle in G2-M phase. Computational modeling analysis suggests that the binding mechanism of compound 4n to the colchicine binding site on the microtubules is similar to that of CA4.
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