What Is the Structure of the Antitubercular Natural Product Eucapsitrione?

J Org Chem. 2017 Jul 21;82(14):7287-7299. doi: 10.1021/acs.joc.7b00863. Epub 2017 Jul 5.

Abstract

1,5,7-Trihydroxy-6H-indeno[1,2-b]anthracene-6,11,13-trione (1), proposed to be the antitubercular natural product eucapsitrione, has been synthesized in 43% overall yield and six steps, including a key Suzuki-Miyaura biaryl coupling and a directed remote metalation (DReM)-initiated cyclization. The physical and spectroscopic properties of 1 do not match the data reported for the natural product. At this time there is insufficient information available to enable a structure reassignment. During the optimization of the Suzuki-Miyaura coupling, an unprecedented biaryl coupling ortho to the borono group was observed. The scope of this unusual reaction has been investigated.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anthraquinones / chemical synthesis
  • Anthraquinones / chemistry*
  • Antitubercular Agents / chemical synthesis
  • Antitubercular Agents / chemistry*
  • Biological Products / chemical synthesis
  • Biological Products / chemistry*
  • Carbon-13 Magnetic Resonance Spectroscopy / standards
  • Cyclization
  • Molecular Structure
  • Reference Standards

Substances

  • Anthraquinones
  • Antitubercular Agents
  • Biological Products
  • eucapsitrione