Synthesis and antimicrobial activities of new 4,6-diaryl-4,5-dihydro-3-hydroxy-2H-indazoles

A series of new 4,6-diaryl-4,5-dihydro-3-hydroxy-2H-indazoles 5a5k were synthesized by the cyclization of ethyl 2-oxo-4,6-diarylcyclohex-3-ene carboxylates 4a4k. The compounds were characterized by IR, 1H NMR, 13C NMR, 2D NMR, and elemental analysis. The synthesized compounds were evaluated for in vitro antibacterial and antifungal activities against Staphylococcus aureus, Escherichia coli, Salmonella typhimurium, Pseudomonas aeruginosa, Candida albicans, Aspergillus niger, Aspergillus flavus, and Rhizopus sp. Most of the compounds exhibited good activity against the tested organisms. J. Heterocyclic Chem.,, (2012).