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Hispanane-Type Diterpenoid and Secoiridoid Glucosides from Viburnum cylindricum
Li-Xia Wang1,2, Yin-Dong Fang2, Rui-Han Zhang1
1Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China.
Abstract:
Three hitherto unknown compounds, including one new hispanane-type diterpenoid glucoside, namely viburnumoside (1), two new secoiridoid glucosides, 7α-galloyloxysweroside (2), and 7β-galloyloxysweroside (3), together with ten known compounds (4 - 13) were isolated from the ethanol extract of twigs and leaves of Viburnum cylindricum. Their structures were elucidated on the basis of extensive spectroscopic studies, and the absolute configuration of compound 1 was confirmed by the experimental and calculated electronic circular dichroism (ECD) data.