Two-step conversion of carboxylic esters into distally fluorinated ketones via ring cleavage of cyclopropanol intermediates: application of sulfinate salts as fluoroalkylating reagents
作者:Yulia A. Konik、Marina Kudrjashova、Nele Konrad、Sandra Kaabel、Ivar Järving、Margus Lopp、Dzmitry G. Kananovich
DOI:10.1039/c7ob00680b
日期:——
used in the synthesis of distally fluorinated ketones. Cyclopropane ring cleavage reactions in methanol with aqueous tert-butyl hydroperoxide in the presence of a copper(II) acetate catalyst and sodium triflinate (Langlois reagent) afford β-trifluoromethyl ketones in 16–74% isolated yields. Sodium triflinate serves as a precursor of reactive trifluoromethyl copper species, enabling ring-opening trifluoromethylation
Simple access to β-trifluoromethyl-substituted ketones via copper-catalyzed ring-opening trifluoromethylation of substituted cyclopropanols
作者:Dzmitry G. Kananovich、Yulia A. Konik、Dzmitry M. Zubrytski、Ivar Järving、Margus Lopp
DOI:10.1039/c5cc02386f
日期:——
A variety of β-trifluoromethyl ketones have been easily prepared by CuCl-catalyzed ring-opening trifluoromethylation of cyclopropanols with Togni reagent.
Efficient Synthesis of β-CF<sub>3</sub>/SCF<sub>3</sub>-Substituted Carbonyls via Copper-Catalyzed Electrophilic Ring-Opening Cross-Coupling of Cyclopropanols
作者:Yong Li、Zhishi Ye、Tabitha M. Bellman、Teng Chi、Mingji Dai
DOI:10.1021/acs.orglett.5b00782
日期:2015.5.1
The first copper-catalyzed ring-opening electrophilic trifluoromethylation and trifluoromethylthiolation of cyclopropanols to form Csp3–CF3 and Csp3–SCF3 bonds have been realized. These transformations are efficient for the synthesis of β-CF3- and β-SCF3-substituted carbonyl compounds that are otherwise challenging to access. The reaction conditions are mild and tolerate a wide range of functional
Exploiting the inductive effect of the trifluoromethyl group: regioselective gold-catalyzed hydration of 2,2,2-trifluoroethyl-substituted alkynes
作者:Raphaël Gauthier、Nikolaos V. Tzouras、Steven P. Nolan、Jean-François Paquin
DOI:10.1039/d3cc02034g
日期:——
2-trifluoroethyl-substituted alkynes is highly regioselective, producing β-trifluoromethylketones as major products. This transformation illustrates the strong directing effect of the trifluoromethylgroup, through its inductive effect, in gold-catalyzed addition to alkynes.
Gammagammagamma-trifluorocarbonyl compounds are easily obtained in a good yield by introduction of the 1,1,1-trifluoroethyl moiety (CF3-CH2-) on the alpha-methylene group of a ketone.