Probing the aurone scaffold against Plasmodium falciparum: Design, synthesis and antimalarial activity

Marta P. Carrasco, Ana S. Newton, Lídia Gonçalves, Ana Góis, Marta Machado, Jiri Gut, Fátima Nogueira, Thomas Hänscheid, Rita C. Guedes, Daniel J V A Dos Santos, Philip J. Rosenthal, Rui Moreira

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

A library comprising 44 diversely substituted aurones derivatives was synthesized by straightforward aldol condensation reactions of benzofuranones and the appropriately substituted benzaldehydes. Microwave enhanced synthesis using palladium catalyzed protocols was introduced as a powerful strategy for extending the chemical space around the aurone scaffold. Additionally, Mannich-base derivatives, containing a 7-aminomethyl-6-hydroxy substitution pattern at ring A, were also prepared. Screening against the chloroquine resistant Plasmodium falciparum W2 strain identified novel aurones with IC 50 values in the low micromolar range. The most potent compounds contained a basic moiety, with the ability to accumulate in acidic digestive vacuole of the malaria parasite. However, none of those aurones revealed significant activity against hemozoin formation and falcipain-2, two validated targets expressed during the blood stage of P. falciparum infection and functional in digestive vacuole of the parasite. Overall, this study highlight (i) the usefulness of aurones as platforms for synthetic procedures using palladium catalyzed protocols to rapidly deliver lead compounds for further optimization and (ii) the potential of novel aurone derivatives as promising antimalarial compounds.

Original languageEnglish
Pages (from-to)523-534
Number of pages12
JournalEuropean Journal of Medicinal Chemistry
Volume80
DOIs
Publication statusPublished - 10 Jun 2014

Keywords

  • Aurones
  • Cross-coupling reactions
  • Malaria
  • Plasmodium falciparum

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