Several chromones from the stems of Polygonum aubertii Henry

Abstract

Two new 2-alkylchromanones, 2-tricosyl-2,5,7-trihydroxy-chromanone (6) and 2-pentacosyl-2,5,7-trihydroxy-chromanone (7), together with five known 2-alkylated chromones and chromanones (1–5), were isolated from the stems of Polygonum aubertii Henry. The structures of these compounds were established by spectroscopic methods including extensive 1D, 2D NMR (¹H-¹H COSY, HSQC, and HMBC), and HR-ESI-MS techniques. In addition, a plausible biosynthetic pathway for these compounds is described.

Keywords:

• Polygonum aubertii
• Polygonaceae
• chromone
• chromanone

Acknowledgements

This work was financially supported by the Foundation for the National Natural Science Foundation of China (NSFC 20621091 and 20875095) and the National Key Technology Research and Development Program of China (No. 2007BAI37B05).