Fourteen diphyllin 4-C-substituted alkylide derivatives were designed and synthesized using a Heck coupling and subsequent hydrogenation reaction. Olefins 3g and 3i exhibited the highest cytotoxicity on breast cancer cell lines MCF-7 with IC50 values of 0.08 and 0.07 µM, and they showed weaker V-ATPase inhibitory potency compared to diphyllin.
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Dong et al. (2024) studied this question.
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