Three unusual sesquineolignans from Alpinia conchigera

Abstract

Three unusual sesquineolignans conchignans A (1), B (2), and C (3), together with two known compounds vanillin (4) and phloroglucinol (5), were isolated from the whole plants of Alpinia conchigera. Their structures were established by spectroscopic analysis, including 2D NMR spectroscopic techniques.

Keywords:

• Zingiberaceae; Alpinia conchigera
• sesquineolignans
• conchignans A–C

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (31000159), Program of Recruited Top Talent of Sciences and Technology of Yunnan province (2009c1120). The authors are grateful to the staff of analytical group at the State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences for the measurement of spectral data.