Three new C-flavonoids from Corallodiscus flabellata

Abstract

Three new C-glycosylflavones, named 5,7,4′-trihydroxy-6-methoxy-8-C-[β-d-xylopyranosyl- (1 → 2)]-β-d-glucopyranosyl flavonoside (1), 5,7,4′-trihydroxy-8-methoxy-6-C-[β-d-xylopyranosyl-(1 → 2)]-β-d-glucopyranosyl flavonoside (2), and 5,3′,4′-trihydroxy-7,8-dimethoxy-6-C-[β-d-xylopyranosyl-(1 → 2)]-β-d-glucopyranosyl flavonoside (3), along with two known compounds 5,4′-dihydroxy-7-methoxy-6-C-glucopyranosyl-flavonoside (4), 3-methoxy-4-hydroxymethyl benzoate (5) were isolated from 70% acetone extract of Corallodiscus flabellata. Their structures were identified on the basis of spectroscopic techniques and chemical methods.

Keywords:

• Gesneriaceae
• Corallodiscus flabellata
• C-glycosylflavone

Acknowledgements

The authors are grateful to Kang Jian-Shun, Zhu Wei-Guo, Zhou Da-Peng, Xin Bin for measurements of NMR and MS, and financial support from Henan Innovation Project for University Prominent Research Talents (2003KYCX002) and the Scientific Foundation for the Outstanding Youngsters of Henan (0212001200).