作者:R. X. Tan、W. Z. Wang、S. X. Wu、L. Yang
DOI:10.1002/mrc.1260330911
日期:1995.9
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
一种新的 ent-kaurane 二萜糖苷已被证明是中国本土传统药物 Aster tongolensis 和 A. ageratoides 的主要甜味成分。本研究涉及通过二维 NMR 技术(COSY、NOESY、HETCOR 和 TOCSY)对化合物及其降解产物进行总 1H 和 13C 光谱归属,并得出明确的光谱归属,尤其是在光谱的复杂区域. 关于绝对立体化学,通过圆二色性和 2D NMR 的组合确定甜味剂为 (4R,5S,8S,9S,10,13R)-16,17-dihydroxykauran-19-oic acid β-D-glupyranosylester技术。