| Abstrakt: |
The structures of the new cycloartane methylsteroid cycloalpigenin B and its glycoside cycloalpioside B, isolated fromAstragalus alopecurusPall. (Leguminosae) have been determined on the basis of chemical transformations with the assistance of1H and13C NMR spectroscopy and 2D NMR1H-1H and1H-13C correlations of chemical signals and IR, CD, and electron-impact mass spectrometry. Cycloalpigenin B is 20R,24S-epoxycycloartane-3β,12α,16β,25-tetraol. A transition from cycloalpigenin B to cycloalpigenin A has been achieved. Cycloalpioside B is 20R,24S-epoxycycloartane-3β,12α,16β,25-tetraol 3-O-β-D-xylopyranoside. |
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