Isolation of (−)-cryptosporiopsin,a chlorinated cyclopentenone fungitoxic metabolite fromPhialophora asteris f. sp.helianthi |
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Authors: | R. J. J. Ch. Lousberg Y. Tirilly M. Moreau |
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Affiliation: | (1) Organisch Chemisch Laboratorium der Rijksuniversiteit te Utrecht, Croesestraat 79, NL-65985 Utrecht, (The Netherlands);(2) Present address: Faculté des Sciences, Laboratoire de Biologie Végétale, Avenue Victor le Gorgeu, F-29283 Brest Cedex, (France) |
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Abstract: | Summary The (–)-enantiomer of cryptosporiopsin, a chlorinated cyclopentenone fungitoxic metabolite, was isolated fromPhialophora asteris f. sp.helianthi. Next to a comparable fungitoxic activity as shown by crypstosporiopsin, the product particularly inhibits growth ofSclerotinia sclerotiorum, an important pathogen on sunflower. Two further metabolites were tentatively identified as a stereoisomer of cryptosporiopsin and its dehydrated derivative.The authors are much indebted to Dr.G. M. Strunz (Canadian Forestry Service) for valuable suggestions and the generous gift of cryptosporiopsin and to the University of Utrecht for the part-time fellowship to one of us (Y.T.) given. |
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