Magnetic Resonance in Chemistry p. 749 - 754 (1995)
Update date:2022-08-11
Topics:
Tan, R. X.
Wang, W. Z.
Wu, S. X.
Yang, L.
A new ent-kaurane diterpenoid glycoside has been shown to be the main sweetening constituent of the traditional medicines Aster tongolensis and A. ageratoides native to China.This study involved the total 1H and 13C spectral assignment of the compound and its degraded product by means of two-dimensional NMR techniques (COSY, NOESY, HETCOR and TOCSY) and resulted in unambiguous spectral assignments, particularly in the heavily convoluted regions of the spectra.Concerning the absolute stereochemistry, the sweetener was determined to be (4R,5S,8S,9S,10S,13R)-16,17-dihydroxykauran-19-oic acid β-D-glucopyranosyl ester through a combination of circular dichroism and 2D NMR techniques. - Keywords: NMR; 13C NMR; 1H NMR; kaurane diterpenoid; absolute configuration
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