Abstract
AbstractThe four novel iridals 8–10 and 18 were isolated from rhizome extracts of Iris pallida and Iris foetidissima, and their structures were established by spectroscopic methods and oxidative degradation. The compounds 8–10 bearing a conjugated triene moiety are extremely labile and decompose rapidly. Thus, the monocyclic triene 8 was only isolated after its conversion to a Diels‐Alder adduct with 4‐phenyl‐3H‐1,2,4‐triazole‐3,5(4H)‐dione (14), The tricyclic iridal 18 is a hitherto unknown precursor of α‐irone. The possible biogenesis of these unusual triterpenoids is discussed.
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