Triterpene Glycosides and Their Genins from Astragalus. LXIX. Orbigenin, the First Lanostanoid from Astragalus Plants

摘要

The new lanostane methylsteroid orbigenin, the structure of which is 23ξ,24ξ-lanost-9(11)-en-3β,7β,16β,19,23,24,25-heptaol, was isolated from Astragalus orbiculatus Ledeb. (Leguminosae). The structure of the new triterpenoid, the first lanostanoid from plants of the Astragalus genus, was determined using electron-impact mass spectrometry and PMR and ~(13)C NMR spectroscopies interpreted using J-modulation, DEPT, and the 2D NMR methods: ~1H-~1H COSY, HSQC, and HMBC.