Experimental and Theoretical Study of an Intramolecular CF3-Group Shift in the Reactions of [alpha]-Bromoenones with 1,2-Diamines

The reactions of trifluoromethylated 2-bromoenones and N,N'-dialkyl-1,2-diamines have been studied. Depending on the structures of the starting compounds, the formation of 2-trifluoroacetylpiperazine or 3-trifluoromethylpiperazine-2-ones was observed. The mechanism of the reaction is discussed...

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Bibliographic Details
Published in:Chemistry : a European journal 2015-11, Vol.21 (47), p.16982
Main Authors: Muzalevskiy, Vasily M, Ustynyuk, Yury A, Gloriozov, Igor P, Chertkov, Vyacheslav A, Rulev, Alexander Yu, Kondrashov, Evgeniy V, Ushakov, Igor A, Romanov, Alexey R, Nenajdenko, Valentine G
Format: Article
Language:English
Subjects:
Chemistry
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Summary:The reactions of trifluoromethylated 2-bromoenones and N,N'-dialkyl-1,2-diamines have been studied. Depending on the structures of the starting compounds, the formation of 2-trifluoroacetylpiperazine or 3-trifluoromethylpiperazine-2-ones was observed. The mechanism of the reaction is discussed in terms of multistep processes involving sequential substitution of bromine in the starting [alpha]-bromoenones and intramolecular cyclization of the captodative aminoenones as key intermediates to form the target heterocycles. The results of theoretical calculations are in perfect agreement with the experimental data. The unique role of the trifluoromethyl group in this reaction is demonstrated.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201502706