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The palladium-catalyzed arylation of different α-methylene-γ-lactone-containing sesquiterpene lactones was shown to produce E-olefin coupling products selectively in moderate to excellent yields. Biological evaluation of these semisynthetic sesquiterpene lactone derivatives in HeLa cells showed interesting antiproliferative profiles and provided initial structure−activity data.
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Han et al. (2009) studied this question.
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