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Dictyotadimer A, a new dissymmetric bis-diterpene from a brown alga of the genus Dictyota

✍ Scribed by Yannick Viano; Dominique Bonhomme; Annick Ortalo-Magné; Olivier P. Thomas; Mohamed El Hattab; Louis Piovetti; Yves Blache; Gérald Culioli

Publisher
Elsevier Science
Year
2011
Tongue
French
Weight
525 KB
Volume
52
Category
Article
ISSN
0040-4039

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✦ Synopsis

A phytochemical investigation of a Mediterranean brown alga (Dictyota sp.) led to the isolation of a novel C 40 bis-diterpene, named dictyotadimer A. The chemical structure of this unusual dissymmetric dimer, characterized by a C-C linkage between two different xenicane units, was elucidated by 1D and 2D NMR analyses together with HR-ESI mass spectrometry. The relative configuration of the two diterpenoid components was determined by NOESY NMR correlations and molecular modeling. A plausible biogenetic pathway of dictyotadimer A was also proposed.

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