RDC-Based Determination of the Relative Configuration of the Fungicidal Cyclopentenone 4,6-Diacetylhygrophorone A12

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• 作者：Volker Schmidts ; Maic Fredersdorf ; Tilo L眉bken ; Andrea Porzel ; Norbert Arnold ; Ludger Wessjohann ; Christina M. Thiele
• 刊名：Journal of Natural Products
• 出版年：2013
• 出版时间：May 24, 2013
• 年：2013
• 卷：76
• 期：5
• 页码：839-844
• 全文大小：309K
• 年卷期：v.76,no.5(May 24, 2013)
• ISSN：1520-6025

文摘

The hygrophorones, a class of cyclopentenones isolated from fruiting bodies of the genus Hygrophorus (basidiomycetes), show promising antifungal activity. While the constitution of 4,6-diacetylhygrophorone A¹² (3) and the relative configuration of the stereogenic centers in the cyclopentenone ring were elucidated using standard NMR and MS techniques, the relative configuration of the exocyclic stereogenic center could not be assigned. By introducing a sample of 3 into an alignment medium and measuring anisotropic NMR parameters, namely, residual dipolar couplings, we were able to unambiguously determine the relative configuration of all three stereogenic centers in 4,6-diacetylhygrophorone A¹² simultaneously by fitting several structure proposals to the experimental data.