A new lignan, chicanine, isolated from the fruit of Schisandra sp., is shown to possess structure 1, 2S-(3-methoxy-4-hydroxyphenyl)-3R,4S-dimethyl-5S-(3,4-methylenedioxyphenyl)tetrahydrofuran, from spectra analysis and chemical conversions. The tetrahydrofuran ring exists in a "twist envelope" conformation.
The structures of two new triterpenoid acids, anwuweizonic acid (1) and manwuweizic acid (2), from Schisandra propinqua are elucidated by spectroscopic evidence and chemical correlation. Compound 2 shows significant inhibitory activity against Lewis lung cancer, brain tumor-22, and solid hepatoma in mice, and exhibits no cytotoxic action in vitro.
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