Reactions of regioisomeric fluoroalkyl-containing ?-aminovinyl ketones with hydrazines
作者:K. I. Pashkevich、V. I. Filyakova、O. A. Kuznetsova
DOI:10.1007/bf01430665
日期:1996.12
Fluoroalkyl β-alkyl-β-aminovinyl ketones react with hydrazine hydrate to give the respective razoles and with phenylhydrazine they form a mixture of pyrazoles and 5 hydroxy-δ2-pyrazolines. Alkyl(aryl) β-fluoroalkyl-β-aminovinylketones do not react with the hydrazines mentioned above. With 2,4-dinitrophenylhydrazine, both types of fluoroalkyl-containing β-aminovinyl ketones give only hydrazones of the
Ambident polyfluoroalkyl-substituted pyrazoles in the methylation reactions
作者:Anna E. Ivanova、Yanina V. Burgart、Viktor I. Saloutin、Pavel A. Slepukhin、Sophia S. Borisevich、Sergey L. Khursan
DOI:10.1016/j.jfluchem.2017.01.009
日期:2017.3
good regioselectivity in the methylation of polyfluoroalkylpyrazoles was reached while varying the reaction conditions. Under basic conditions, methylation of such pyrazoles led to the preferred formation of 3-RF-pyrazoles, whereas the use of dimethyl sulfate in the absence of a base resulted in the predominant formation of 5-RF-pyrazoles. A proposed mechanism of methylation was discussed.