Scissoring Enaminone C═C Double Bond by Free Radical Process for the Synthesis of α-Trifluoromethyl Ketones with CF3SO2Na

The C═C double bond cleavage on tertiary enaminones, enabling the formation of a new C-CF₃ bond, has been realized as a practical method for the synthesis of α-trifluoromethyl ketones with only the promotion of TBHP and ambient heating. Control experiments support that the reactions proceed via a featured free radical process. The deuterium labeling experiment employing D₂O indicates that water participated in the product formation by donating the hydrogen atom for the newly generated α-C-H bond in the product.

Photoinduced synthesis of α-trifluoromethylated ketones through the oxidative trifluoromethylation of styrenes using CF3SO2Na as a trifluoromethyl reagent without an external photoredox catalyst

A photoinduced strategy to access α-CF₃-substituted ketones by styrenes with sodium trifluoromethanesulfinate (CF₃SO₂Na) without an external photocatalyst was developed.