Synthesis and structure of regioisomeric amino enones containing 2-pyridyl and CF3 substituents
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 comparativ...
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Published in | Russian chemical bulletin Vol. 69; no. 12; pp. 2355 - 2362 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.12.2020
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Subjects | |
Online Access | Get full text |
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Summary: | 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 CF
3
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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ISSN: | 1066-5285 1573-9171 |
DOI: | 10.1007/s11172-020-3030-1 |