Abstract
Regioisomeric amino enones (Z)-4-amino-1,1,1-trifluoro-4-(2-pyridyl)but-3-en-2-one and (Z)-3-amino-4,4,4-trifluoro-1-(2-pyridyl)but-2-en-1-one were synthesized by the reaction of lithium (Z)-1,1,1-trifluoro-4-oxo-4-(2-pyridyl)but-2-en-2-olate with ammonium acetate in glacial AcOH. A comparative study of physicochemical properties and the crystal structures showed that the molecules of these new compounds are planar (except for two fluorine atoms) with an U-shaped configuration of the keto enamine moiety. A change in the position of the amino group with respect to the CF3 substituent leads to significant changes in the electron density distribution and the C-C bond lengths in the keto enamine moiety and also in the character of intermolecular hydrogen bonds responsible for the crystal packing mode of regioisomeric amino enones.
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The work was performed within the framework of the State assignment (No. AAAA-A19-119012290117-6) using facilities of the Joint Use Center “Spectroscopy and Analysis of Organic Compounds” (JUC SAOC) of the I. Ya. Postovsky Institute of Organic Synthesis of the Ural Branch of the Russian Academy of Sciences.
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Slepukhin, P.A., Boltacheva, N.S., Pervova, M.G. et al. Synthesis and structure of regioisomeric amino enones containing 2-pyridyl and CF3 substituents. Russ Chem Bull 69, 2355–2362 (2020). https://doi.org/10.1007/s11172-020-3030-1
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DOI: https://doi.org/10.1007/s11172-020-3030-1
Key words
- organofluorine compounds
- amino enones
- lithium (2)-1,1,1-trifluoro-4-oxo-4-(2-pyridyl)but-2-en-2-olate
- (2)-4-amino-1,1,1-trifluoro-4-(2-pyridyl)but-3-en-2-one
- (2)-3-amino-4,4,4-trifluoro-1-(2-pyridyl)but-2-en-1-one
- chromatography-mass spectrometry
- 1H, 19F, and 13C NMR spectroscopy
- crystal structure
- X-ray diffraction