Urceolatol, a tetracyclic bromobenzaldehyde dimer from Polysiphonia urceolata

Abstract

Urceolatol (1), a novel bromobenzaldehyde dimer, together with one known bromophenol, 3-bromo-4,5-dihydroxy-benzaldehyde (2), were isolated from the red alga Polysiphonia urceolata. The structure and absolute stereochemistry of 1 were elucidated to be (5R,10R)-2,7-dibromo-3,8-dihydroxy-5,10-dimethoxyl-5,10-dihydrochromeno[5,4,3-cde]chromene, on the basis of spectroscopic techniques and X-ray diffraction analysis.

Keywords:

• Urceolatol
• Polysiphonia urceolata
• Rhodomelaceae
• Red alga

Acknowledgements

This research was financially supported by the National “863” project (Grant Nos. 2004AA625030 and 2001AA620503) and supported by Key Innovative Project of the Academy (KZCX3-SW-215).