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
A sequential highly stereoselective hydroboration and Suzuki–Miyaura cross-coupling reaction of fluoroalkylated internal acetylenes: a practical one-pot synthesis of fluoroalkylated trisubstituted alkenes
The one-pot synthesis of trisubstitutedalkenes starting from fluoroalkylated internal alkynes was investigated. Hydroboration of the alkynes proceeded in a highly regio- and stereoselective manner to give the corresponding vinylboranes in excellent yields. Without isolation, treatment of the vinylboranes with various aryl halides under the Suzuki-Miyaura cross-coupling conditions gave the fluoroalkylated
photoredox-catalyzed directC-Htrifluoromethylation of alkenes under mild reaction conditions. In particular, trifluoromethylation of triphenylethene derivatives, from which synthetically valuable tetrasubstituted CF3-alkenes are obtained, have never been reported so far. Remarkably, the present facile and straightforward protocol is extended to double trifluoromethylation of alkenes.
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