New iridoid glycosides from Viburnum punctatum

Publication date: December 2018Source: Phytochemistry Letters, Volume 28Author(s): Yuan Gao, Wan-Qiu Yang, Ku Yang, Xian-Jun Jiang, Xiang-Mei Li, Fei WangAbstractThree 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.Graphical abstract

Source: Phytochemistry Letters - October 27, 2018 Category: Chemistry Source Type: research