Synthesis of some novel heterocyclic compounds derived from diflunisal hydrazide as potential anti-infective and anti-inflammatory agents

Eur J Med Chem. 2007 Jul;42(7):893-901. doi: 10.1016/j.ejmech.2006.12.038. Epub 2007 Feb 25.


Three novel series of 2',4'-difluoro-4-hydroxybiphenyl-3-carboxylic acid derivatives namely 4-substituted-1,2,4-triazoline-3-thiones (4a-g); 2-substituted-1,3,4-thiadiazoles (5a-g) and 2-substituted-1,3,4-oxadiazoles (6a-g) have been synthesized. Twenty-one of the newly synthesized compounds were tested against various bacteria, fungi, yeast species and virus. In addition, we have replaced the carboxylic acid group of diflunisal with heterocycles and the anti-inflammatory activity of heterocycles reported here. Compound (5d) showed activity against Escherichia coli A1 and Streptococcus pyogenes ATCC-176 at a concentration of 31.25 microg/mL, whereas cefepime, the drug used as standard, has been found less active against the bacteria mentioned above. Compound (4b) has exhibited activity against Aspergillus variecolor and Trichophyton rubrum at a concentration of 31.25 and 15.25 microg/mL, whereas Amphotericin B, the drug used as standard, has been found less active against the yeast and fungi. The highest antiviral activity was found in the 1,3,4-thiadiazole derivative (5a) having a methyl group at 2nd position against Sindbis virus at 9.6 microg/mL. Compound (4c) exhibited the highest anti-inflammatory activity (73.03%) whereas diflunisal, the drug used as standard, has been found less active (24.16%). Compound (5f) presented similar antinociceptive activity with the standard drug (paw withdrawal latency was 19.21 s compared to that of diflunisal which was 19.14s, in hot plate test).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anti-Infective Agents / chemical synthesis*
  • Anti-Infective Agents / pharmacology
  • Anti-Inflammatory Agents, Non-Steroidal / chemical synthesis*
  • Anti-Inflammatory Agents, Non-Steroidal / pharmacology
  • Bacteria / drug effects
  • Diflunisal / analogs & derivatives*
  • Female
  • Fungi / drug effects
  • Heterocyclic Compounds / chemical synthesis*
  • Heterocyclic Compounds / pharmacology
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Microbial Sensitivity Tests
  • Molecular Structure
  • Pain / drug therapy
  • Viruses / drug effects


  • Anti-Infective Agents
  • Anti-Inflammatory Agents, Non-Steroidal
  • Heterocyclic Compounds
  • Diflunisal