摘要:
A rapid, improved, and environmentally benign synthesis of 4,4'-aryl or alkyl methylene-bis(1H-pyrazol-5-ols) has been accomplished by tandem Knoevenagel-Michael reaction of 1-aryl-3-alkyl-1H-pyrazol-5-ol with various aldehydes catalyzed by ammonium acetate. All the synthesized compounds 3a-v were evaluated in vitro for their antibacterial activity against Pseudomonas aeruginosa, Xanthomonas protophormiae, Bacillus licheniformis, and Staphylococcus aureus. Among the tested compounds, compounds with trifluromethyl group show excellent antibacterial activity.