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New iridoid glycosides from Viburnum punctatum
- Gao, Yuan, Yang, Wan-Qiu, Yang, Ku, Jiang, Xian-Jun, Li, Xiang-Mei, Wang, Fei
- Phytochemistry letters 2018 v.28 pp. 145-148
- Viburnum, glucose, iridoid glycosides, moieties, spectral analysis
- Three hitherto unknown valeriana-type iridoid glycosides (1−3) were isolated from Viburnum punctatum, and their structures were elucidated by extensive spectroscopic analysis. The new compounds, designated as viburpunosides A − C (1−3), are characterized by having a mono- or triacylated α-l-rhamnopyranosyl-(1→2)-β-d-glucopyranosyl moiety linked to C-11. This is the second report of an iridoid attached to a disaccharide other than glucose in this genus. The absolute configuration of new compounds was briefly discussed.