Abstract
Seconoriridone A (1), a novel C16-seco-noriridal with a 5/5/7 tricyclic scaffold, was isolated from the rhizome of Belamcanda chinensis. Its structure and absolute configuration were determined by NMR spectroscopy and quantum chemical calculations. Notably, seconoriridone A featured a 2-butanonyl moiety with oxidative cleavage of the conventionally multisubstituted cyclohexane ring of iridals. Seconoriridone A was a mixture of C-14 epimers in the presence of hemiacetal. The plausible biosynthetic pathway for 1 was deduced.
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