Abstract
Two unprecedented tricyclic-iridal triterpenoids, belamcandanes A–B (1–2), have been isolated from the rhizomes of Belamcanda chinensis. The structures of 1 and 2 were assigned by interpretation of spectroscopic data including NMR and MS, and their absolute configurations were assigned by ECD calculation. Compounds 1–2 possess a spiro[4,5]decane core structure and a α-terpineol moiety, representing the first example of tricyclic-iridal triterpenoids. The plausible biogenetic pathway for 1 and 2 is also proposed.
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