Beauvetetraones A-C, phomaligadione-derived polyketide dimers from the entomopathogenic fungus, Beauveria bassiana.

Lee SR, Küfner M, Park M, Jung WH, Choi SU, Beemelmanns C, Kim KH (2019) Beauvetetraones A-C, phomaligadione-derived polyketide dimers from the entomopathogenic fungus, Beauveria bassiana. Org Chem Front 6, 162-166.

Abstract

We report the isolation of two novel epimeric phomaligadione-derived polyketides, beauvetetraones A-B (1-2), from the entomopathogenic fungus Beauveria bassiana. Beauvetetraones A and B feature an unprecedented methylene-bridged phloroglucinol skeleton with a highly rearranged scaffold. In addition, a dimer of two phomaligadiones, named beauvetetraone C, was isolated for the first time from a natural source. The structures of compounds 1−3 including their absolute configurations were unambiguously assigned by NMR spectroscopic analyses, phenylglycine methyl ester (PGME) analysis, and quantum chemical ECD calculations. A putative biosynthetic pathway for beauvetetraones A-C is proposed.

Leibniz-HKI-Authors

Christine Beemelmanns
Michelle Küfner

Identifier

doi: 10.1039/C8QO01009A