Chemoenzymatic Synthesis of (+)-Asperpentyn and the Enantiomer of the Structure Assigned to Aspergillusol A

J Nat Prod. 2015 Aug 28;78(8):1963-8. doi: 10.1021/acs.jnatprod.5b00304. Epub 2015 Aug 13.

Abstract

Total syntheses of (+)-asperpentyn (1) and compound ent-2, the enantiomer of the structure, 2, assigned to the natural product aspergillusol A are reported. Both reaction sequences employ the enzymatically derived and enantiomerically pure cis-1,2-dihydrocatechol 4 as starting material and use Sonogashira cross-coupling chemistry to install the required enyne side-chain. The (1)H and (13)C NMR spectroscopic data derived from compound ent-2 match those reported for aspergillusol A, thus suggesting that the gross structure of this natural product has been assigned correctly, although its absolute stereochemistry remains unclear.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biological Products / chemical synthesis*
  • Biological Products / chemistry
  • Cyclohexenes / chemical synthesis*
  • Cyclohexenes / chemistry
  • Epoxy Compounds / chemical synthesis*
  • Epoxy Compounds / chemistry
  • Molecular Structure
  • Nuclear Magnetic Resonance, Biomolecular
  • Stereoisomerism
  • Tyrosine / analogs & derivatives*
  • Tyrosine / chemical synthesis
  • Tyrosine / chemistry

Substances

  • Biological Products
  • Cyclohexenes
  • Epoxy Compounds
  • aspergillusol A
  • asperpentyn
  • Tyrosine