Regioselective synthesis of fluorine-containing indazolones from 2-acylcyclohexane-1,3-diones

New regioisomeric indazolones containing fluorine atoms in the aromatic ring have been synthesized in high yield by the interaction of 2-acylcyclohexane-1,3-diones, and of their enol methyl ethers, obtained by methylating the initial β,β′-triketones with dimethyl sulfate in the presence of calcined potassium carbonate, with 4-fluorophenylhydrazine hydrochloride and with pentafluorophenylhydrazine. The structures of the synthesized compounds were confirmed by data of IR and ¹H, ¹³C, and ¹⁹F NMR spectra. Dedicated to Distinguished Scientist Academician A. A. Akhrem in his 95^th Year. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 393–403, March, 2008.