Catalytic C–H α-Trifluoromethylation of α,β-Unsaturated Carbonyl Compounds
摘要:
A copper(I)-catalyzed, regioselective C-H alpha-trifluoromethylation of alpha,beta-unsaturated carbonyl compounds using Togni's reagent was developed. Diverse substrates, including enones as well as alpha,beta-unsaturated esters, thioesters, and amides, stereospecifically afforded the corresponding (E)-alpha-trifluoromethylated products in moderate to high yields. Further, this method was applied to the C-H trifluoromethylation of drugs.
Stereoselective Synthesis of α-Trifluoromethyl Enones by Au<sup>I</sup>/Cu<sup>I</sup>-Co-Catalyzed Tandem 1,3-Acyloxy Migration/Trifluoromethylation Reaction of Propargyl Acetates
AuI/CuI-co-catalyzed tandem 1,3-acyloxy migration/trifluoromethylation reaction of propargyl esters to give α-trifluoromethyl enones in moderate yields and with excellent stereoselectivity is described. It is proposed that the reaction proceeds through the 1,3-acyloxy migration of the propargyl esters catalyzed by AuI to produce an allenic intermediate, followed by its trifluoromethylation to give