Two new C-methyl flavanones from the rhizomes and frond bases of Matteuccia struthiopteris

Abstract

Two new C-methyl flavanones, (2S)-5,7-dihydroxy-6,8-dimethyl-4′-methoxydihydroflavone-7-O-(6″-O-acetyl)-β-d-glucopyranoside (1) and (2S)-5,7-dihydroxy-6,8-dimethyldihydroflavone-7-O-(6″-O-acetyl)-β-d-glucopyranoside (2), together with five known compounds, demethoxymatteucinol-7-O-β-d-glucopyranoside (3), matteucinol-7-O-β-d-glucopyranoside (4), 5,7-dihydroxy-6-methyl-4′-methoxydihydroflavone (5), methoxymatteucin (6), and thunberginol C (7), were first isolated from the EtOH extract of the rhizomes and frond bases of Matteuccia struthiopteris. The structures were established by spectral analyses, mainly HR-ESI-MS and 1D and 2D NMR experiments (COSY, HSQC, and HMBC).

Keywords::

• Onocleaceae
• Matteuccia struthiopteris
• C-methyl flavanones

Acknowledgments

The work was financially supported by the International Science & Technology Cooperation Program of China No. 2011DFA30870 and by the bilateral grant from the Ministry of Education, Youth and Sports of the Czech Republic No. ME10116.