Phenalenones and Polyesters from Talaromyces stipitatus and Structure Revision of Talaromycesone A

J Nat Prod. 2024 Dec 27;87(12):2738-2745. doi: 10.1021/acs.jnatprod.4c00885. Epub 2024 Dec 16.

Abstract

Investigation of the secondary metabolites of the filamentous fungus Talaromyces stipitatus led to the isolation of two new phenalenone dimers, talarohemiketal A (1) and talaroazasone A (2), and one new macrolide polyester, talaromacrolactone A (3), along with the reported oxyphenalenone dimers talaromycesone A (4), bacillisporin A (5), bacillisporin B (6), bacillisporin C (7), epi-bacillisporin F (8), and bacillisporin J (9), the phenalenone monomer funalenone (10), the polyesters 15G256α (11) and 15G256ν (12), and 6-hydroxymellein (13). Detailed analysis of 2D NMR correlations, supported by TDDFT calculations, led to the structural revision of talaromycesone A as 4 from previously reported structure 14. In addition, the previously misassigned NMR spectra of compound 8 have been corrected.

MeSH terms

  • Humans
  • Molecular Structure
  • Phenalenes* / chemistry
  • Polyesters* / chemistry
  • Talaromyces* / chemistry

Substances

  • Phenalenes
  • phenalen-1-one
  • Polyesters