Geranylgeraniol-derived diterpenoids from the brown alga Bifurcaria bifurcata

Three novel diterpenes were isolated from the brown alga Bifurcaria bifurcata collected oA the Atlantic coast from Brittany, and their structures established by spectroscopic methods. Two of them are acyclic diterpenoids derived from 13ketogeranylgeraniol, while the third is a b,g-epoxy-g-butyrolactone derived from (S)-hydroxygeranylgeraniol. Some assignments of 13 C- and 1 H-NMR signals in 13-ketogeranylgeraniol and related diterpenoids were revised to take account of the results obtained in 2D NMR long-range C‐H correlation experiments. These results are discussed from a chemotaxonomic point of view. # 1999 Elsevier Science Ltd. All rights reserved.

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