Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2011, Issue 4, Pages 808-812Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201001324
Keywords
Natural products; Cryptosporiopsis sp.; Octadride maleic anhydides; Density functional calculations; Circular dichroism
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Funding
- Alexander von Humboldt Foundation, Germany
- Deutsche Forschungsgemeinschaft [SFB630]
- National Office for Research and Technology [K-68429, K-81701]
- Janos Bolyai Foundation
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Viburspiran (8), a structurally new member of the maleic anhydride natural products, was isolated, along with seven known compounds 9-15, from the fungal endophyte Cryptosporiopsis sp. The structure of the new compound was elucidated by spectroscopic methods and confirmed by singlecrystal X-ray analysis. The absolute configuration was estab-lished by TDDFT CD calculations by using the solid-state structure for input geometry. Viburspiran (8) is the first representative of a new class of eight-membered maleic anhydride natural products, named octadrides and exhibited antifungal activity against Botrytis cinerea and Microbotryum violaceum.
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