Summary.
A structurally simplified analogue of the antibiotic (+)-heptelidic acid was synthesized in ten steps with an overall yield of 9%. Key step was a conjugate addition of a silyl protected vinylcuprate to an asymmetrically shielded enoate, which gave an adduct as a single diastereomer. Transesterification in the presence of triethylamine allowed a selective cleavage of the chiral auxiliary and afforded an enantiomerically pure methyl ester. This easily enolizable β-ketoester was transformed to the trans configurated methylene derivative using a four-step reaction sequence. Finally, the desired epoxylactone was accessible from the methylene derivative by lactone ring formation and successive oxidation in four steps.
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Received July 13, 2001. Accepted August 16, 2001
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Krenn, M., Urban, E. Asymmetric Synthesis of a Structurally Simplified Analogue of the Antibiotic Heptelidic Acid. Monatshefte fuer Chemie 133, 127–137 (2002). https://doi.org/10.1007/s706-002-8242-9
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DOI: https://doi.org/10.1007/s706-002-8242-9