Halogenated phlorethols and fucophlorethols from the brown alga Cystophora retroflexa

✍ Scribed by Birgit Sailler; Karl-Werner Glombitza

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 67 KB
• Volume: 7
• Category: Article
• ISSN: 1056-9014
• DOI: 10.1002/(sici)1522-7189(199903/04)7:2<57::aid-nt42>3.0.co;2-f

✦ Synopsis

From an ethyl acetate fraction of the brown alga Cystophora retro¯exa several halogenated phlorotannins were isolated. Most of the compounds are derivatives of diphlorethol penta-acetate and triphlorethol-A hepta-acetate. The majority turned out to be chlorinated and/or brominated. Only one iodinated substance, 2-iodophloroglucinol triacetate, was isolated. The structure of this derivative and the following compounds have been characterized previously:

-bromotriphlorethol-A hepta-acetate and 4 [D]chlorobisfucopentaphlorethol-A nonadeca-acetate. Ten halogenated phlorethols and two chlorinated fucophlorethols are described for the ®rst time and characterized as their acetates: 2

2 [D] -bromotetraphlorethol-C nona-acetate, 4 [D] -chlorofucotriphlorethol-B dodeca-acetate and 4 [D] -chlorobisfucotetraphlorethol-A heptadeca-acetate.