Abstract
Condensation of 5-methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one with 4-hydroxybenzaldhyde in alcoholic sodium hydroxide yielded 4-(4-hydroxybenzylidene)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, and treatment of the latter with acetylacetone, hydrazine hydrate, ethyl cyanoacetate, and ethyl acetoacetate gave pyranopyrazole, pyrazolopyrazole, and pyrazolopyridine derivatives. 5-Methyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one was reacted with 2,4-dichlorobenzoyl isothiocyanate, thiosemicarbazide, and hydrazine hydrate to afford pyrazolooxazine, pyrazolopyrazole, and spiro[pyrazole-3,3′-pyrazolo[3,4-c]pyrazole] derivatives. Some of the newly synthesized compounds showed high antimicrobial activity against three microbial strains (S. aureus, E. coli, C. albicans).
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Abdelrahman, E.F., Shehta, W., Assy, M.G.M. et al. Synthesis of Pyrano, Pyrido, Oxazino, and Spiro Pyrazole Derivatives and Their Antimicrobial Activity. Russ J Org Chem 56, 1832–1839 (2020). https://doi.org/10.1134/S1070428020100267
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DOI: https://doi.org/10.1134/S1070428020100267