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Synthesis of potential antimicrobial oxiranylisobenzofuranones

Synthese von potentiell antimikrobiellen Oxiranylisobenzofuranonen

  • Organische Chemie Und Biochemie
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Summary

Five epoxylactones of structural similarity to the antimicrobial sesquiterpene lactone heptelidic acid were synthesized. Starting from perhydroisobenzofuranone, 7a-vinyl- and 7a-allyl-perhydroisobenzofuranone were prepared and oxidized to yield epimeric mixtures of 7a-oxiranyl-and 7a-oxiranylmethylperhydroisobenzofuranones which were separated by chromatography. In a four step synthesis perhydroisobenzofurane-1,7-dione was prepared, transformed to 7-methylene-perhydroisobenzofuranone, and reacted withmCPBA to give the (3aRS, 7RS, 7aRS)-configurated spirocyclic epoxylactone as a single diastereomer. In a preliminary screening model, epoxylactones proved to be of low toxicity.

Zusammenfassung

Fünf Epoxylactonen, die strukturelle Ähnlichkeiten mit dem antimikrobiellen Sesquiterpenlacton Heptelidsäure aufweisen, wurden synthetisiert. Aus Perhydroisobenzofuranon wurden 7a-Vinyl- und 7a-Allyl-perhydroisobenzofuranon dargestellt und durch Oxidation Mischungen der epimeren 7a-Oxiranyl- bzw. 7a-Oxiranylmethyl-perhydroisobenzofuranone erhalten, die chromatographisch getrennt wurden. Aus Perhydroisobenzofuran-1,7-dion, das in vier Stufen zugänglich ist, wurde 7-Methylen-perhydroisobenzofuranon hergestellt und anschließend mitmCPBS oxidiert, wobei das (3aRS, 7RS, 7aRS)-konfigurierte, spirocyclische Epoxylacton diastereomerenrein entstand. In einem einfachen Testmodell wiesen die Epoxylactone nur geringe Toxizität auf.

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Hollauf, G., Urban, E. Synthesis of potential antimicrobial oxiranylisobenzofuranones. Monatsh Chem 126, 1203–1212 (1995). https://doi.org/10.1007/BF00824298

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  • DOI: https://doi.org/10.1007/BF00824298

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