Bromophenols from the brown alga Leathesia nana

Abstract

Two new bromophenols, (E)-3-(2,3-dibromo-4,5-dihydroxyphenyl)-2-methylpropenal (1) and 3-(2,3-dibromo-4,5-dihydroxyphenyl)-2-methyl-1-propanol (2), together with 11 known bromophenols (3–13), were isolated from the ethanolic extract of the brown alga Leathesia nana S. et G. Their structures have been elucidated by spectroscopic methods, including IR, MS, HRMS, 1D and 2D NMR techniques.

Keywords:

• Brown alga
• Leathesiaceae
• Leathesia nana S. et G
• Bromophenols

Acknowledgements

The authors are grateful to Professor Ablez Zeper for mass spectra measurements. This work was supported by a grant from the National High Technology Development Project (863 Project) (No. 2001AA620403).