Absolute Configuration of Brevisamide and Brevisin: Confirmation of a Universal Biosynthetic Process for Karenia brevis Polyethers

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• 作者：Ryan M. Van Wagoner ; Masayuki Satake ; Andrea J. Bourdelais ; Daniel G. Baden ; Jeffrey L. C. Wright
• 刊名：Journal of Natural Products
• 出版年：2010
• 出版时间：June 25, 2010
• 年：2010
• 卷：73
• 期：6
• 页码：1177-1179
• 全文大小：140K
• 年卷期：v.73,no.6(June 25, 2010)
• ISSN：1520-6025

文摘

The discovery of brevisin, the first example of an “interrupted” polycyclic ether, obtained from the dinoflagellate Karenia brevis, posed some important questions regarding the mechanism of the cyclization process. Consequently, we have established absolute configurations of brevisin and its related metabolite brevisamide using a modified Mosher’s esterification method. For brevisin, analysis was carried out on both the 31-monokis- and the 10,31-bis-MTPA esters. The results suggest that both metabolites, like other polyethers from K. brevis, result from polyepoxide precursors with uniform (S, S) configurations for all epoxides and provide further support for a universal stereochemical model for dinoflagellate polyether formation.