Three new acylated flavone C-glycosides from the flowers of Trollius chinensis

Abstract

Three new flavone C-glycosides with the substitution of the unusual acyl, 2″-O-veratroylisoswertisin (1), 3″-O-2-methylbutyrylisoswertiajaponin (2), and 3″-O-2-methylbutyrylvitexin (3), together with the known compounds of 2″-O-2-methylbutyrylisoswertisin (4), 3″-O-2-methylbutyrylisoswertisin (5), and trollisin I (6) were isolated from the antibacterial fraction of the aqueous extract of the flowers of Trollius chinensis. The structural elucidations of these compounds were carried out by a detailed analysis of the NMR and MS spectra.

Keywords:

• Trollius chinensis
• Rannuculaceae
• 2″-O-veratroylisoswertisin
• 3″-O-2-methylbutyrylisoswertiajaponin
• 3″-O-2-methylbutyrylvitexin

Acknowledgements

We are grateful to Associate Prof. Shin-ichi Tebayashi and Dr Bin Wu of the Department of Bioresources Science, Faculty of Agriculture, Kochi University, for the help in measuring the NMR spectra.