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Two new halogenated sesquiterpenes from the red alga laurencia majuscula Harvey

✍ Scribed by Minoru Suzuki; Etsuro Kurosawa

Publisher
Elsevier Science
Year
1978
Tongue
French
Weight
248 KB
Volume
19
Category
Article
ISSN
0040-4039

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✦ Synopsis

In the course of our continuing studies for constituents of the marine red alga genus Laurencia (Rhodomelaceae), we have recently reported (2) the structures of several halogenated and nonhalogenated aromatic sesquiterpenes from L. okamurai -Yamada ("mitsudesozo" in Japanese) collected at Nyudogatane, Okino-shima, Tosa Prov., Japan. We collected &. majuscula Harvey ("akasozo") in the same location and investigated its essential oil. There are two new halogenated chamigrenetype sesquiterpenes as the major components in this alga and we report below the structures of these compounds.

Half-dried algae (ca. 1.8 kg) (3) were extracted with methanol in the usual manner, and the neutral methanol extract (ca. 15 g) was fractionated by column chromatography on neutral alumina. Benzene eluates were rechromatographed over

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