59 紅藻類うらそぞの成分kumausallene,kumausyne,deacetylkumausyneの構造

概要

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In our continuing studies on the secondary metabolites of the red algae genus Laurencia, we reported that the diversity of terpenoids and nonterpenoids biosynthesis in L. nipponica Yamada has been found to be dependent upon the growth localities. As part of further investigations on the constituents of this species, we examined a specimen newly collected at Kumausu, near Otaru, Hokkaido, and isolated five new bromoethers, designated as kumausallene (1), trans-deacetylkumausyne (2), cis-deacetylkumausyne (3), trans-kumausyne (4), and cis-kumausyne (5), respectively. The structure of kumausallene (1), including the absolute configuration, was established on the basis of the spectral properties and chemical correlation with isoprelaurefucin (9). The structures of other compounds, 2, 3, 4, and 5, were also determined by the physical and chemical methods. As anticipated, Kumausu's specimen displayed the existence of halogenated C_<15>-nonterpenoids which seem to be the characteristic metabolites of L. nipponica in the warm current region of Hokkaido (Japan Sea).
天然有機化合物討論会の論文
1982-09-10