Antimalarial troponoids, puberulic acid and viticolins; divergent synthesis and structure-activity relationship studies

Sci Rep. 2017 Aug 3;7(1):7259. doi: 10.1038/s41598-017-07718-3.

Abstract

Divergent synthesis of antimalarial troponoids, including naturally occurring compounds, some of which were identified and isolated by our group, has been achieved utilizing the total synthetic route of puberulic acid. Structure-activity relationships of natural products and simple troponoids inspired us to explore more detailed properties of this class of compounds. Access to new derivatives was facilitated through intermediate compounds generated during the total synthesis of puberulic acid by a stepwise oxidation-aromatization sequence to provide 7-hydroxytropolones and bromination for conversion of the carboxylic acid moiety. The first total synthesis of viticolin A, as well as the synthesis of different methyl-substituted derivatives, has also been achieved. In vitro antimalarial activity and cytotoxicity of novel derivatives were evaluated and fundamental information to facilitate the discovery of more promising antimalarials was obtained.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antimalarials / chemical synthesis
  • Antimalarials / chemistry*
  • Antimalarials / pharmacology*
  • Biological Products / chemical synthesis
  • Biological Products / chemistry*
  • Biological Products / pharmacology*
  • Carboxylic Acids / chemical synthesis
  • Carboxylic Acids / chemistry*
  • Carboxylic Acids / pharmacology*
  • Cell Line
  • Cell Survival / drug effects
  • Chemistry Techniques, Synthetic
  • Humans
  • Inhibitory Concentration 50
  • Molecular Structure
  • Oxidation-Reduction
  • Parasitic Sensitivity Tests
  • Plasmodium falciparum / drug effects
  • Structure-Activity Relationship
  • Tropolone / analogs & derivatives*
  • Tropolone / chemical synthesis
  • Tropolone / chemistry
  • Tropolone / pharmacology

Substances

  • Antimalarials
  • Biological Products
  • Carboxylic Acids
  • puberulic acid
  • Tropolone