Experimental and Theoretical Study of an Intramolecular CF3‐Group Shift in the Reactions of α‐Bromoenones with 1,2‐Diamines |
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| Authors: | Dr. Vasily M. Muzalevskiy Prof. Dr. Yury A. Ustynyuk Dr. Igor P. Gloriozov Dr. Vyacheslav A. Chertkov Dr. Alexander Yu. Rulev Dr. Evgeniy V. Kondrashov Dr. Igor A. Ushakov Alexey R. Romanov Prof. Dr. Valentine G. Nenajdenko |
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| Affiliation: | 1. Department of Chemistry, Moscow State University, Leninskie Gory, Moscow 119992 (Russia), Fax: (+7)?495‐932‐8846;2. A.?E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1, Favorsky Str., Irkutsk 664033 (Russia), Fax: (+7)?3952‐419346 |
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| Abstract: | 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 α‐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. |
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| Keywords: | fluorine heterocycles reaction mechanisms rearrangement substituent effects |
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