Reaction of polyfluorinated cyclohexa-2,4-dienones with aryl nitrile oxides
作者:V. N. Kovtonyuk、Yu. V. Gatilov
DOI:10.1134/s1070428013080204
日期:2013.8
Reaction of 1,3-dipolar cycloaddition of 6-chloropentafluorocyclohexa-2,4-dienone, 6-chloro-3-(pentafluorophenoxy)tetrafluorocyclohexa-2,4-dienone, and perfluoro-6-phenoxycyclohexa-2,4-dienone with aryl nitrile oxides proceeds highly stereoselectively at the c C=O group of the dienone providing in a high yield mixtures of diastereomeric fluorine-containing 3-aryl-1,4-dioxa-2-azaspiro[4,5]deca-2,6,8-trienes
1,3-偶极环加成反应的6-氯五氟环己二-2,4-二烯酮,6-氯-3-(五氟苯氧基)四氟环己二-2,4-二烯酮和全氟-6-苯氧基环己-2,4-二烯酮与芳基的反应腈氧化物在二烯酮的c C = O基团高度立体选择性地提供高收率的非对映异构的含氟3-芳基-1,4-二氧杂-2-氮杂螺[4,5]十碳-2,6混合物, 8-三烯。后者与五氟酚酸钠的反应沿着烯丙基取代的类型进行,得到多氟化的3-芳基-8-苯氧基-1,4-二氧杂-2-氮杂螺[4,5]癸-2,6,9-三烯。
Reactions of polyfluorinated cyclohexadienones with diazoalkanes. Part 1. Formation of cyclopropanes from polyfluorinated cyclohexa-2,4-dienones with diazomethane and phenyldiazomethane
作者:Vladimir N. Kovtonyuk、Ljubov S. Kobrina、Yurij V. Gatilov、Irina Yu. Bagryanskaya、Roland Fröhlich、Günter Haufe
DOI:10.1039/b001618g
日期:——
The reaction of 6-chloro-2,3,4,5,6-pentafluorocyclohexa-2,4-dienone (1) with diazomethane gives a mixture of two diastereoisomers of 6-chloro-3a,4,5,6,7a-pentafluoro-3,3a,6,7a-tetrahydrospiro[indazole-7,2′-oxirane] 2a and 2b. In contrast phenyldiazomethane reacts with polyfluorinated cyclohexa-2,4-dienones 1, 9, and 10 in acetonitrile to form the fluorinated 7-phenylbicyclo[4.1.0]hept-4-en-2-ones 4a
proceed as [4+2]-cycloadditions with inverse electron demand. In contrast, a polyfluorinated 2,4-cyclohexadienone with a methoxy group in the three-position shows no reaction with either α- or β-fluorostyrene, but does undergo rearrangement to give a polyfluorinated 2,5-cyclohexadienone. 4-Fluorooct-4-en-3-one is inert to all polyfluorinated 2,4-cyclohexadienones.
Formation of polyfluorinated azobenzenes and azophenols in the reactions of chloropentafluoro-cyclohexa-2,5- and -2,4-dienones with phenyl- and pentafluorophenylhydrazines
作者:V. N. Kovtonyuk
DOI:10.1134/s1070428014010060
日期:2014.1
4-Chloropentafluorocyclohexa-2,5-dienone reacted with phenyl- and pentafluorophenylhydrazines in the presence of AlCl3 via addition to the carbonyl group with formation of the corresponding azobenzenes. The reaction of 6-chloropentafluorocyclohexa-2,4-dienone with phenyl- and pentafluorophenylhydrazines both in the presence and in the absence of AlCl3 afforded mainly 3-arylazotetrafluorophenols as products of nucleophilic replacement of fluorine atom at the double C=C bond.