Abstract
Aim To study the chemical constituents of the aerial parts of Schisandra propinqua var. propinqua. Method Silica gel, C 18 reversed phase silica gel and HPLC were used. The structures were elucidated by extensive spectroscopic methods. Result Two new triterpenoids, propinic lactone A ( 1) with 3, 4- seco-cycloartane skeleton, and propinic lactone B ( 2) possessing 3, 4:9, 10- seco-cycloartane skeleton, together with a known typical cycloartane triterpenoid, schizandronic acid ( 3), have been isolated and identified. Conclusion These two new triterpenoids serve as two important bridge intermediates from cycloartane triterpenoids to Schisandra nortriterpenoids biogenetically.
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