Five new unsaturated iridolactones 3-7 related to natural cytotoxic oxylipins, Tei 9826, and iridolactone 2, were prepared by parallel synthesis from natural aucubin. It was found that perpivaloyl iridoid glucosides 2, 3, and 4 were markedly cytotoxic against both L1210 and KB-3-1 cell lines.
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