J Nat Prod. 2009 Jul;72(7):1237-40.

Characterization of a Dispiroketal Spirolide Subclass from Alexandrium ostenfeldii.

Roach JS, Leblanc P, Lewis NI, Munday R, Quilliam MA, Mackinnon SL.

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Institute for Marine Biosciences, National Research Council of Canada, Halifax, Nova Scotia, Canada B3H 3Z1.

Abstract

A new subclass of spirolide marine toxins, represented by spirolides H (1) and I (2), were isolated from the marine dinoflagellate Alexandrium ostenfeldii. Spirolides H and I are structurally distinct from other spirolides in that they contain a 5:6 dispiroketal ring system rather than the trispiroketal ring system characteristic of previously isolated spirolides. The structures were assigned using a combination of spectrometric and spectroscopic techniques. Previously isolated spirolides containing a cyclic imine moiety showed toxicity in the mouse bioassay. Spirolide H contains this cyclic imine moiety but does not show toxicity in the mouse assay, suggesting that the presence of the cyclic imine moiety is not the only structural requirement for toxicity.

PMID:: 19572609; [PubMed - indexed for MEDLINE]

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Characterization of a Dispiroketal Spirolide Subclass from Alexandrium ostenfeldii.

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