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Four new nortriterpenoids, pre-schisanartanins C and D (1–2) with pre-schisanartane backbone, and propintrilactones A and B (3–4) possessed wuweiziartane framework, were isolated from the acetone extract of the stems of Schisandra propinqua var. propinqua. Their structures were characterized by extensive spectroscopic analyses. Compounds 3 and 4 existed as a pair of slowly interconverting diastereomers...
A class of C 29 triterpene dilactones (1–6) featuring 18(13→14)-abeo-schiartane skeleton have been isolated from the stems of Schisandra propinqua var. propinqua. The structures of new compounds, propindilactones K–O (1–5), were determined on the basis of comprehensive spectroscopic means. Biogenetic pathway of 1–6 was proposed and then chemically mimicked. The absolute stereochemistries of...
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