Three new flavonol triglycosides from Derris trifoliata

Abstract

Three new flavonol triglycosides, kaempferol-3-O-α-l-rhamnopyranosyl-(1 → 6)-β-d-glucopyranosyl-(1 → 3)-β-d-glucopyranoside (1), quercetin-3-O-α-l-rhamnopyranosyl-(1 → 6)-β-d-glucopyranosyl-(1 → 3)-β-d-glucopyranoside (2), quercetin-3-O-α-l-rhamnopyranosyl-(1 → 6)-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside (3), together with the two known flavonol glycosides, kaempferol-3-O-α-l-rhamnopyranosyl-(1 → 6)-β-d-glucopyranoside and kaempferol-3-O-α-l-rhamnopyranosyl-(1 → 6)-β-d-glucopyranosyl-(1 → 2)-β-d-glucopyranoside, were isolated from the aerial parts of Derris trifoliata. Their structures were determined on the basis of chemical and spectroscopic analyses.

Keywords:

• Derris trifoliata
• Leguminosae
• flavonol triglycosides

Acknowledgements

We are grateful to the financial support by a grant (2007AA10Z441) from the Chinese National Programs for High Technology Research and Development, grants (07JC14025 and 07dz12055) from Science and Technology Commission of Shanghai Municipality, a grant (06AZ053) from Education Commission of Shanghai, and a grant (2005CCA04800) from the National Key Program for Base Research (973 program). We are also grateful to the Center of Analysis and Measurement, Institute of Chemistry, Chinese Academy of Sciences, for the HR-SI-MS; Laboratory of NMR Analysis and Measurement, South China Sea Institute of Oceanology, for the NMR spectra.