Effects of B2pin2 and PCy3 on copper-catalyzed trifluoromethylation of substituted alkenes and alkynes with the Togni reagent
作者:Pär G. Janson、Nadia O. Ilchenko、Alberto Diez-Varga、Kálmán J. Szabó
DOI:10.1016/j.tet.2014.12.077
日期:2015.2
The copper-catalyzed oxytrifluoromethylation of phenylacetylenes and C–H trifluoromethylation of quinones were studied. It was found that both reactions are accelerated by B2pin2 and PCy3 additives. The two reactions have different substituent effects. The oxytrifluoromethylation is faster in the presence of electron-donating groups, while the C–H trifluoromethylation is faster with electron-withdrawing
Electrophilic Trifluoromethylation by Copper-Catalyzed Addition of CF<sub>3</sub>-Transfer Reagents to Alkenes and Alkynes
作者:Pär G. Janson、Ibrahim Ghoneim、Nadia O. Ilchenko、Kálmán J. Szabó
DOI:10.1021/ol3011419
日期:2012.6.1
Regio- and stereoselective Cu-catalyzed addition of the above hypervalentiodinereagent to alkynes and alkenes was achieved. In the presence of CuI, the reaction is suitable to perform trifluoromethyl-benzoyloxylation and trifluoromethyl-halogenation of alkenes and alkynes. Electron-donating substituents accelerate the process, and alkenes react faster than alkynes emphasizing the electrophilic character