Synthesis and antibacterial activity of a new series of 3-[3-(substituted phenyl)-1-phenyl-1H-pyrazol-5-yl]-2H-chromen-2-one derivatives

Abstract

A series of 3-[3-(substituted phenyl)-1-phenyl-1H-pyrazol-5-yl]-2H-chromen-2-one (4a–k) were synthesized by reaction of 3-[2,3-dibromo-3-(substituted phenyl)propanoyl]-2H-chromen-2-one (3 a-k) with phenyl hydrazine in presence of triethylamine in absolute ethanol, characterized by spectral data and screened for their in vitro antibacterial activity against gram-positive and gram-negative bacteria. Among the series, compounds 4d, 4h and 4i displayed an encouraging antibacterial activity profile as compared to reference standard drug ciprofloxacin against tested bacterial strains.

Keywords::

• Antibacterial activity
• ciprofloxacin
• coumarin
• pyrazole

Acknowledgement

The authors are thankful to Principal, RVS College of Pharmaceutical Science, Sulur, Coimbatore, for providing necessary facilities to carry out this research work. We are grateful to the Director, SAIF, Punjab University for providing spectral analysis.

Declaration of interest

The authors declare no conflict of interest.