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Synlett 2012(3): 371-374
DOI: 10.1055/s-0031-1290135
DOI: 10.1055/s-0031-1290135
LETTER
© Georg Thieme Verlag
Stuttgart ˙ New York
Total Synthesis of Altenusin and Alterlactone
Further Information
Publication History
Received
27 October 2011
Publication Date:
19 January 2012 (online)


Abstract
The resorcylic lactone alterlactone, a mycotoxin produced by alternaria sp., was synthesized for the first time. The total synthesis was achieved in nine steps with 69% yield starting with acetal-protected phloroglucinic acid and 6-bromopiperonal, where the longest linear sequence consists of five steps. Key step is a Suzuki coupling used for the construction of the central biaryl bond. When the final deprotection with cleavage of benzyl ethers (yielding unprotected alterlactone) was performed in a less polar solvent the biaryl mycotoxin altenusin was obtained.
Key words
polyketides - fungal metabolites - resorcylic lactones - cross-coupling - Suzuki reaction
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