Triterpene glycosides of Thalictrum squarrosum. III. Structures of squarrogenins 1 and 2
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Abstract
Two genins — squarrogenin 1 and squarrogenin 2 — have been isolated from nodding meadow rue by the hydrolysis of squarrosides A1 and A2. The compounds are epimeric at C-21 and have the following structures: 1 — (21R, 22S, 23R)-21-methoxy-21,23-epoxycycloart-24-ene-3β,22β-30-triol, C31H50O5, mp 169–171°C (hexane-acetone), [α] 546 20 −11.06° (c 4.52; pyridine); and 2 — (21S, 22S, 23R)-21-methoxy-21,23-epoxycycloart-24-ene-3β,22β,30-triol, C31H50O5, mp 190–193°C (hexane-acetone), [α] 546 20 +106.6° (c 0.3; pyridine). The results of1H and13C NMR spectroscopy and of mass spectrometry for the new compounds are given.
Keywords
USSR Academy Triterpene Glycoside Cyclopropane Ring Triol Quaternary Carbon AtomPreview
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© Plenum Publishing Corporation 1990