Total synthesis of potent antifungal marine bisoxazole natural products bengazoles A and B

Chemistry. 2007;13(19):5515-38. doi: 10.1002/chem.200700033.

Abstract

The bengazoles are a family of marine natural products that display potent antifungal activity and a unique structure, containing two oxazole rings flanking a single carbon atom. Total syntheses of bengazole A and B are described, which contain a sensitive stereogenic centre at this position between the two oxazoles. Additionally, the synthesis of 10-epi-bengazole A is reported. Two parallel synthetic routes were investigated, relying on construction of the 2,4-disubstituted oxazole under mild conditions and a diastereoselective 1,3-dipolar cycloaddition. Our successful route is high yielding, provides rapid access to single stereoisomers of the complex natural products and allows the synthesis of analogues for biological evaluation.

MeSH terms

  • Antifungal Agents / chemical synthesis*
  • Antifungal Agents / chemistry
  • Electronic Data Processing
  • Magnetic Resonance Spectroscopy
  • Mass Spectrometry
  • Oxazoles / chemical synthesis*
  • Oxazoles / chemistry
  • Spectroscopy, Fourier Transform Infrared
  • Stereoisomerism

Substances

  • Antifungal Agents
  • Oxazoles
  • bengazole A