Design, synthesis, and structure-activity correlations of novel dibenzo[b,d]furan, dibenzo[b,d]thiophene, and N-methylcarbazole clubbed 1,2,3-triazoles as potent inhibitors of Mycobacterium tuberculosis

J Med Chem. 2012 Apr 26;55(8):3911-22. doi: 10.1021/jm300125e. Epub 2012 Apr 9.

Abstract

A molecular hybridization approach is an emerging structural modification tool to design new molecules with improved pharmacophoric properties. In this study, 1,2,3-triazole-based Mycobacterium tuberculosis inhibitors and synthetic and natural product-based tricyclic (carbazole, dibenzo[b,d]furan, and dibenzo[b,d]thiophene) antimycobacterial agents were integrated in one molecular platform to prepare various novel clubbed 1,2,3-triazole hybrids using click chemistry. Structure-activity correlations and in vitro activity against M. tuberculosis strain H37Rv of new analogues revealed the order: dibenzo[b,d]thiophene > dibenzo[b,d]furan > 9-methyl-9H-carbazole series. Two of the most potent M. tuberculosis inhibitors 13h and 13q with MIC = 0.78 μg/mL (∼1.9 μM) displayed a low cytotoxicity and high selectivity index (50-255) against four different human cancer cell lines. These results together provided the potential importance of molecular hybridization and the development of triazole clubbed dibenzo[b,d]thiophene-based lead candidates to treat mycobacterial infections.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antitubercular Agents / chemical synthesis*
  • Benzofurans / chemical synthesis*
  • Benzofurans / pharmacology
  • Carbazoles / chemical synthesis*
  • Cell Line, Tumor
  • Click Chemistry
  • Cytostatic Agents / pharmacology
  • Drug Design
  • Humans
  • Mycobacterium tuberculosis / drug effects*
  • Thiophenes / chemical synthesis*
  • Thiophenes / pharmacology
  • Triazoles / chemical synthesis*
  • Triazoles / pharmacology

Substances

  • Antitubercular Agents
  • Benzofurans
  • Carbazoles
  • Cytostatic Agents
  • Thiophenes
  • Triazoles
  • dibenzofuran
  • dibenzothiophene