Reactions of 2-polyfluoroalkylchromones with aliphatic diamines
作者:V. Ya. Sosnovskikh、V. A. Kutsenko
DOI:10.1007/bf02496279
日期:1999.4
Abstract2-Polyfluoroalkylchromones react with aliphatic 1,2-diamines to give 2,3-dihydro-1H-1,4-diazepines. A similar reaction with 1,3-diaminopropane yieldsN,N′-trimethylenebis(2-hydroxyacetophenomines) as a result of scission of the original chromones.
A Simple One-Pot Synthesis of 2,6-Disubstituted 4-(Polyfluoroalkyl)pyridines and -pyrimidines by Reaction of 2-Polyfluoroalkylchromones with Aromatic Methyl Ketimines and Amidines
作者:Vyacheslav Ya. Sosnovskikh、Boris I. Usachev、Aleksei Yu. Sizov、Mikhail A. Barabanov
DOI:10.1055/s-2004-822321
日期:——
The reaction of 2-polyfluoroalkylchromones with ketimines, derived from aromatic methyl ketones and isopropylamine, gives 2,6-diaryl-4-polyfluoroalkylpyridines in moderate to low yields. Benzamidine and guanidine also react with 2-polyfluoroalkylchromones to afford the corresponding 2,6-disubstituted 4-polyfluoroalkylpyrimidines.
Reaction of Polyhaloalkyl-Substituted Chromones, Pyrones, and Furanones with Salicylaldehydes as a Direct Route to Fused 2<i>H</i>-Chromenes
作者:Vyacheslav Ya. Sosnovskikh、Vladislav Yu. Korotaev、Dmitry L. Chizhov、Igor B. Kutyashev、Danil S. Yachevskii、Olga N. Kazheva、Oleg A. Dyachenko、Valery N. Charushin
DOI:10.1021/jo060459x
日期:2006.6.1
Polyhaloalkyl-substituted chromones, γ-pyrones, and β-furanones react with salicylaldehydes in the presence of piperidine to give a wide variety of fused 2H-chromenes in good yields. This novel annulation reaction presumably proceeds by a tandem intermolecular oxa-Michael addition and subsequent intramolecular Mannich condensation.
Synthesis and reactivity of 2-polyfluoroalkylchromene-4(4H)-thiones
作者:B. I. Usachev、M. A. Shafeev、V. Ya. Sosnovskikh
DOI:10.1007/s11172-005-0115-9
日期:2004.10
2-Polyfluoroalkylchromene-4(4H)-thiones, synthesized from 2-polyfluoroalkylchromones and P2S5, react with aniline, phenylhydrazines, and hydroxylamine at the C(4) atom and afford corresponding anils, phenylhydrazones, and oximes of chromones. On heating in alcohol in the presence of concentrated HCl, chromone phenylhydrazones and oximes undergo ring closure to form 3-(2-hydroxyaryl)-1-phenyl-5-polyfluoroalkylpyrazoles and 5-hydroxy-3-(2-hydroxyaryl)-5-polyfluoroalkyl-Δ2-isoxazolines.
A Novel and Simple Synthesis of Substituted Anilines by Reaction of 2-Polyfluoroalkylchromones with (Isopropylidene)isopropylamine
作者:Vyacheslav Ya. Sosnovskikh、Boris I. Usachev、Aleksei Yu. Sizov
DOI:10.1055/s-2004-829532
日期:——
The reaction of 2-polyfluoroalkylchromones with (isopropylidene)isopropylamine gives N-isopropyl 3-(2-hydroxyaryl)-5-(polyfluoroalkyl)anilines in good to moderate yields.