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Homocamptothecin (hCPT) is an E‐ring modified camptothecin (CPT) analogue, which showed pronounced inhibitory activity of topoisomerase I. In search of novel hCPT‐type anticancer agents, two series of hCPT derivatives were synthesized and evaluated in vitro against three human tumor cell lines. The results indicated that the 10‐substituted hCPT derivatives had a considerably higher cytotoxic activity...
Six 9‐(heteroarylmethylidene)amino derivatives, 2a–2f, of homocamptothecin were synthesized for the first time by total synthesis in 22 steps and biologically evaluated as inhibitors of topoisomerase I. Moreover, the antitumor activities of 2a–2f against three human tumor cell lines, i.e., A‐549, MDA‐MB‐435, and HCT‐116, were determined and the results showed that compound 2c was the most active homocamptothecin...
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