FUCOPHLORETHOLS FROM THE BROWN-ALGAE SARGASSUM-SPINULIGERUM AND CYSTOPHORA-TORULOSA

The brown alga Sargassum spinuligerum contains a variety of fuhalols. In addition to these compounds, a number of fucophlorethols were isola ted in the form of their peracetylated derivatives and identified by m eans of spectral analysis. The following phlorotannins were identified : the known, fucophlorethol-B octa-acetate, fucodiphlorethol-B, -D and -F deca-acetate, hydroxyfucodiphlorethol-A undeca-acetate, bisfucotri phlorethol-A pentadeca-acetate, hydroxybisfucophlorethol-A hexadeca-ac etate, bisfucotetraphlorethol-A heptadeca-acetate and the new, dihydro xyfucotriphlorethol-A and -B tetradeca-acetate, bisfucopentaphlorethol -B nonadeca-acetate, chlorobisfucopentaphlorethol-A nonadeca-acetate, difucodiphlorethol-A trideca-acetate and fucodifucotetraphlorethol-A i cosa-acetate. Bisfucotriphlorethol-A pentadeca-acetate, chlorobisfucop entaphlorethol-A nonadeca-acetate and fucodifucotetraphlorethol-A icos a-acetate were also isolated from the brown alga, Cystophora torulosa. (C) 1997 Elsevier Science Ltd.