Three new bibenzyl derivatives from Dendrobium nobile

Abstract

Three new bibenzyl derivatives have been isolated from the stems of Dendrobium nobile Lindl. (Orchidaceae). Their structures were established as 4,5-dihydroxy-3,3′,α-trimethoxybibenzyl (1), 4,4′-dihydroxy-3,3′,5,α-tetramethoxybibenzyl (2) and 4-hydroxy-3,3′,4′,5,α-pentamethoxybibenzyl (3) on the basis of spectroscopic analysis.

Keywords:

• Dendrobium nobile
• Orchidaceae
• Bibenzyl derivatives
• Dendrobium nobile

Acknowledgements

The authors thank Ms. Xiao Li-ping, Hongkong Kadoorie Farm & Botanic Garden, for identification of the plant materials. We are grateful to Shanghai Institute of Materia Medica of Chinese Academy of Science for measuring the HREIMS. Thanks are also given to Chen Bin and Luo Qun-hui for UV, IR and optical rotations spectral data.