Synthesis of 3-Arylindazole-1-acetic Acids and In Vitro Study of Potential Antibacterial Effect

Background: Indazoleacetic acids and their pharmaceutically acceptable salts have been claimed to be useful as anti-inflammatory, analgesic and antipyretic agents. They are active in the treatment of respiratory diseases such as asthma, bronchitis, allergies and obstructive pulmonary diseases. Objectives: We report herein a feasible study concerned about the design, synthesis, structure and in vitro antimicrobial activity of 3-arylindazole-1-acetic acids derivatives. Series of compounds were synthesized by alkylation of 3-arylindazoles. Method: Synthesized compounds were subjected to study the effect on microbial growth in vitro. All synthesized compounds were found to exhibit antibacterial activities against a range of grampositive (Bacillus subtilis, Staphylococcus aureus) and gram-negative bacteria (Shigella sonnei, Escherichia coli) by broth dilution method. Results: The synthesized compounds exhibited antibacterial activities comparable to fluoroquinolones and some compounds exhibited better activity. These findings suggest a great potential of 3-arylindazole-1-acetic acids as antibacterial compounds. Conclusion: 3-Arylindazole-1-acetic acids are potent antimicrobial agent better than their respective 3-arylindazoles that revealed moderate activity against both gram positive and gram negative bacteria.