Synthesis and biological evaluation of [α-(1,5-disubstituted 1H-pyrazol-4-yl)benzyl]azoles, analogues of bifonazole
摘要:
A series of pyrazole analogues of bifonazole, an antifungal drug used in clinical practice, 2a-h and 4a-b were synthesized and tested in vitro against Candida albicans, Cryptococcus neoformans and Aspergillus fumigatus, with no significant results. Imidazoles 2a-h were also tested in vivo for antiarrhythmic and antihypertensive activities; two of these compounds showed moderate activity against ventricular fibrillation caused by aconitine in rats. The above compounds were prepared by reaction of phenyl[5 substituted 1-phenyl (or 1-methyl)-1H-pyrazol-4-yl]methanols with N,N'-carbonyldiimidazole (2a-h) or of the respective chloro derivatives with 1H-1,2,4-triazole (4a-h). (C) 1999 Elsevier Science S.A. All rights reserved.
symmetrical enaminodiketones 8–14 with substitutedhydrazines. When using alkylhydrazines, if the substituent size of the alkyl group is small, it is possible to selectively synthesize 1-substituted 4-aroyl-5arylpyrazoles and their regioisomers, 1-substituted 4-aroyl-3-arylpyrazoles, by choosing the solvent (EtOH or toluene). When they react with bulky substitutedhydrazines (e.g., cyclohexyl, phenyl, or pyridyl)
A pyrazole derivative represented by the general formula (1a) or (1b):
wherein
R1 represents a hydrogen atom or a pesticidally acceptable protecting group; R2 and R3 represent a phenyl, 1-naphthyl or 2-naphthyl group, or a 5-6 membered heterocyclic ring and the like;
R4 represents a hydrogen or halogen atom, or a alkyl, alkoxy or alkylthio group; and a herbicidal composition containing the pyrazole derivative.