A cycloartane triterpene 3 beta, 16 beta diglucoside from Astragalus trigonus and its non natural 6-hydroxy epimer
1998
Verotta, L. | Orsini, Francesco | Tato, M. | El-Sebakhy, N.A. | Toaima, S.M.
The detailed investigation of Astralagus trigonus DC roots, led to the isolation of a new cycloartan-3 beta, 16 beta diglucoside, whose structure was elucidated by extensive use of 1D- and 2D- high field (600 MHz) NMR techniques. The NaBH4 reduction of the natural 6-oxo 3 beta, 16 beta diglucoside, previously isolated from the same plant, afforded the 6-epi-derivative of the new compound. The conformational preference of both these compounds has been investigated by high field 1H NMR spectroscopy and molecular modeling techniques.
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