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Artatrovirenols A and B: Two Cagelike Sesquiterpenoids from Artemisia atrovirens

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posted on 2020-10-22, 09:15 authored by Li-Hua Su, Chang-An Geng, Tian-Ze Li, Yun-Bao Ma, Xiao-Yan Huang, Xue-Mei Zhang, Ji-Jun Chen
Artatrovirenols A and B (1 and 2), two novel cagelike sesquiterpenoids, possess a unique 5/5/6/5/5-pentacyclic and a 5/5/6/5-tetracyclic system with an unprecedented tetracyclo­[5.3.1.1.4,1101,5]­dodecane scaffold from Artemisia atrovirens. The structures of compounds 1 and 2 including their absolute stereochemistry were elucidated through extensive spectroscopic analyses, X-ray crystallography, and quantum chemical calculations. Plausible biosynthetic pathways for the new isolates were proposed from the naturally occurring arglabin (3) via the key intramolecular Diels–Alder cycloaddition. Compound 1 showed cytotoxicity against three human hepatoma cell lines (HepG2, SMMC-7721, and Huh7) with half maximal inhibitory concentration values of 123.8, 44.0, and 142.6 μΜ, respectively.

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