Three New E-Secoursane Triterpenoid Saponins from the Leaves of Ilex dunniana

[摘要]：Three new triterpenoid saponins with an 18,19-secours-13(18)-ene skeleton, dunnianaolactones AC (13, resp.), together with nine known compounds i.e., the ursane-type triterpene saponin 4, the two benzofuran lignans 5 and 6, five flavonoid glycosides, and 4-hydroxybenzoic acid, were isolated from the leaves of Ilex dunniana Levl. (Aquifoliaceae). Their structures were elucidated by means of spectroscopic and chemical methods. The configuration of dunnianaolactone A (1) was further confirmed by X-ray crystal-structure analysis.

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