Synthesis and monoamine oxidase inhibitory activities of some 3-(4-fluorophenyl)-5-aryl-n-substituted-4,5-dihydro-(1H)-pyrazole-1-carbothioamide derivatives

Drug Res (Stuttg). 2014 Nov;64(11):591-8. doi: 10.1055/s-0033-1363997. Epub 2014 Jan 22.


28 new 3-(4-fluorophenyl)-5-aryl-N-substituted-4,5-dihydro-1H-pyrazole-1-carbothioamide derivatives were synthesized and evaluated in vitro for their monoamine oxidase (MAO) A and B inhibitory activity and selectivity. The derivatives substituted by halogen on the fifth position of pyrazole ring, inhibited MAO-A enzyme with a high selectivity index. On the other hand, compounds substituted with 2-naphthyl inhibited MAO-B enzyme with a moderate selectivity index. Docking studies were done to highlight the interactions of the most active derivative with the active site of MAO-A. In addition, in vivo antidepressant and anxiolytic activities of the compounds having selective MAO-A inhibitory effects, were investigated by using Porsolt forced swimming and elevated plus-maze tests respectively. 3-(4-Fluorophenyl)-5-(4-chloro-phenyl)-N-allyl-4,5-dihydro-1H-pyrazole-1-carbothio-amide has antidepressant, 3-(4-fluorophenyl)-5-(4-chlorophenyl)-N-methyl-4,5-dihydro-1H-pyrazole-1-carbothioamide and 3-(4-fluoro-phenyl)-5-(4-bromophenyl)-N-ethyl-4,5-dihydro-1H-pyrazole-1-carbothioamide have anxiolytic activity.

MeSH terms

  • Animals
  • Anti-Anxiety Agents / chemical synthesis
  • Anti-Anxiety Agents / pharmacology
  • Antidepressive Agents / chemical synthesis
  • Antidepressive Agents / pharmacology
  • Female
  • Male
  • Mice
  • Models, Molecular
  • Molecular Docking Simulation
  • Monoamine Oxidase Inhibitors / chemical synthesis*
  • Monoamine Oxidase Inhibitors / chemistry
  • Monoamine Oxidase Inhibitors / pharmacology
  • Pyrazoles / chemical synthesis*
  • Pyrazoles / pharmacology


  • Anti-Anxiety Agents
  • Antidepressive Agents
  • Monoamine Oxidase Inhibitors
  • Pyrazoles