Abstract
Thirty genistein (= 5,7-dihydroxy-3-(4-hydroxyphenyl)-4H-1-benzopyran-4-one; GEN) derivatives were synthesized from genistein through a facile approach in high yields. Compounds 9, 11, 12, 23-30 were reported for the first time, while 13-22 have already been reported in our recent paper. The cytotoxic activities of these compounds were evaluated against a human nasopharyngeal epidermoid tumor cell line KB. Compounds 7-9, 12, 14, 16-19, 21, 24, 27, 29 showed remarkable antitumor activities in vitro, which was comparable with 5-fluorouracil, an anticancer drug. On the basis of the obtained experimental data, structure-effect relationships were discussed.
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