Synthesis of trifluoromethylated acetylenes via copper-catalyzed trifluoromethylation of alkynyltrifluoroborates
摘要:
A new method for the synthesis of trifluoromethylated acetylenes is developed which involves the copper-catalyzed trifluoromethylation of alkynyltrifluoroborates with an electrophilic trifluoromethylating reagent. This method offers significant advantages such as efficiency and mild and base-free reaction conditions. A plausible mechanism is proposed. (c) 2012 Published by Elsevier Ltd.
An improved method for the efficient copper-mediated trifluoromethylation of terminalalkynes has been developed. This protocol highlights the convenient access to a variety of aryl-substituted trifluoromethylated alkynes by oxidativetrifluoromethylation with two equivalents of TMSCF3 at room temperature.
Synthesis of trifluoromethyl-group-containing cyclopentadienones by the palladium-catalyzed [2 + 2 + 1] cycloaddition of aryl- and trifluoromethyl-group substituted internal alkynes and carbon monoxide
We investigated the palladium-catalyzed [2 + 2 + 1] cycloaddition of aryl- and trifluoromethyl-group-substituted internal alkynes and carbon monoxide, and revealed that the PdBr2 effectively catalyzed the intended reaction. The PdBr2-catalyzed reaction smoothly proceeded and provided aryl- and trifluoromethyl-group-containing cyclopentadienone derivatives in up to 92% yield.