Talaronoids A–D: four fusicoccane diterpenoids with an unprecedented tricyclic 5/8/6 ring system from the fungus Talaromyces stipitatus

Talaronoids A–D (1–4), four diterpenoids with an unexpected tricyclic 5/8/6 carbon skeleton isolated from Talaromyces stipitatus, represent a new class of fusicoccane diterpenoids and the first examples of natural products with a benzo[a]cyclopenta[d]cyclooctane skeleton. Their structures were established by a combination of extensive spectroscopic analyses and electronic circular dichroism spectral calculations. Plausible biosynthetic pathways of 1–4 are proposed starting from geranylgeranyl diphosphate with a Wagner–Meerwein rearrangement as the key step. Compounds 1–4 were evaluated for butyrylcholinesterase inhibitory activity in vitro, and compounds 1–4 showed moderate activity.

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