Friedel–Crafts Alkylation of Arenes with 2-Halogeno-2-CF<sub>3</sub>-styrenes under Superacidic Conditions. Access to Trifluoromethylated Ethanes and Ethenes
作者:Maria A. Sandzhieva、Anna N. Kazakova、Irina A. Boyarskaya、Alexandr Yu. Ivanov、Valentine G. Nenajdenko、Aleksander V. Vasilyev
DOI:10.1021/acs.joc.6b00419
日期:2016.6.17
corresponding benzyl cations [ArHC+-CH(X)CF3] takes palace under protonation of E-/Z-2-halogeno-2-CF3 styrenes [ArCH=C(X)CF3, X = F, Cl, Br] in superacids. The structure of these new electrophiles were studied by means of NMR and theoretical DFT calculations. Accordingly to these data, in the case of bromo derivatives the formed cations, most probably, exist as cyclic bromonium ions, however in the cases of chloro
developed that allows direct vinylic C−H bond trifluoromethylation of 1,1‐diarylalkenes by a high‐valent copper(III) trifluoromethyl complex, producing biologically active trifluoromethylated alkenes (as well as trifluoromethylated carbocyclic compounds). This fundamental reactivity of Cu(III)−CF3 compounds has thus far been unknown. The presence of a tertiary amine is crucial to this reaction, acting
Hydroarylation of 1-aryl-2-halogeno-3,3,3-trifluoropropenes in CF 3 SO 3 H: Regioselective approach to trifluoromethylated diarylethanes and ethenes
作者:Mariya Sandzhieva、Dmitry S. Ryabukhin、Vasily M. Muzalevskiy、Elena V. Grinenko、Valentine G. Nenajdenko、Aleksander V. Vasilyev
DOI:10.1016/j.tetlet.2016.01.099
日期:2016.3
reaction of these electrophilic species with arenes [Ar′H] afforded diastereomeric 1,1-diaryl-2-halogeno-3,3,3-trifluoro propanes [Ar(Ar′)CH–CH(X)CF3] in high yields (up to 96%). The obtained halogenopropanes were easily transformed to the corresponding trifluoromethylated diarylethenes [Ar(Ar′)CCCF3] in yields of up to 95% by dehydrohalogenation using base. The elimination of chlorides and bromides using
Reactions of trifluoromethyl-substituted arylacetylenes with arenes in superacids
作者:H. M. H. Alkhafaji、D. S. Ryabukhin、V. M. Muzalevskiy、L. V. Osetrova、A. V. Vasilyev、V. G. Nenajdenko
DOI:10.1134/s1070428013030032
日期:2013.3
Protonation of the C≡C bond in trifluoromethyl-substituted arylacetylenes ArC≡CCF3 by the action of superacids (CF3SO3H or HSO3F) generates vinyl cations ArC+=CHCF3 which react with arenes Ar′H to give alkenes Ar(Ar′)C=CHCF3. Protonation of the latter at the C=C bond in the reaction medium yields stable cations Ar(Ar′)C+-CH2CF3 which are converted into E/Z-isomeric alkenes Ar(Ar′)C=CHCF3 and/or alcohols
Regiocontrolled Hydroarylation of (Trifluoromethyl)acetylenes in Superacids: Synthesis of CF<sub>3</sub>-Substituted 1,1-Diarylethenes
作者:Haider M. H. Alkhafaji、Dmitry S. Ryabukhin、Vasiliy M. Muzalevskiy、Aleksander V. Vasilyev、Georgy K. Fukin、Alexey V. Shastin、Valentine G. Nenajdenko
DOI:10.1002/ejoc.201201375
日期:2013.2
trifluoromethylated vinyl cations was confirmed by DFT calculations. The stable 2,2,2-trifluoroethylated carbocation reaction intermediates were observed by 1H, 13C, and 19F NMR spectroscopy. Under treatment with aluminium bromide, the reaction of 3,3,3-trifluoro-1-phenylpropyne with benzene formed 1,3,3-triphenylindene. The hydration of aryl(trifluoromethyl) alkynes in sulfuric or trifluoroaceticacids smoothly produced