Design, synthesis, and biological evaluation of novel arylcarboxamide derivatives as anti-tubercular agents

Shahinda S.R. Alsayed, Shichun Lun, Giuseppe Luna, Chau Chun Beh, Alan D. Payne, Neil Foster, William R. Bishai, Hendra Gunosewoyo

Research output: Contribution to journalArticlepeer-review


Our group has previously reported several indolecarboxamides exhibiting potent antitubercular activity. Herein, we rationally designed several arylcarboxamides based on our previously reported homology model and the recently published crystal structure of the mycobacterial membrane protein large 3 (MmpL3). Many analogues showed considerable anti-TB activity against drug-sensitive (DS) Mycobacterium tuberculosis (M. tb) strain. Naphthamide derivatives 13c and 13d were the most active compounds in our study (MIC: 6.55, 7.11 μM, respectively), showing comparable potency to the first line anti-tuberculosis (anti-TB) drug ethambutol (MIC: 4.89 μM). In addition to the naphthamide derivatives, we also identified the quinolone-2-carboxamides and 4-arylthiazole-2-carboxamides as potential MmpL3 inhibitors in which compounds 8i and 18b had MIC values of 9.97 and 9.82 μM, respectively. All four compounds retained their high activity against multidrug-resistant (MDR) and extensively drug-resistant (XDR) M. tb strains. It is worth noting that the two most active compounds 13c and 13d also exhibited the highest selective activity towards DS, MDR and XDR M. tb strains over mammalian cells [IC50 (Vero cells) ≥ 227 μM], indicating their potential lack of cytotoxicity. The four compounds were docked into the MmpL3 active site and were studied for their drug-likeness using Lipinski's rule of five.

Original languageEnglish (US)
Pages (from-to)7523-7540
Number of pages18
JournalRSC Advances
Issue number13
StatePublished - Feb 19 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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