Cobalt–Tertiary-Amine-Mediated Hydroxytrifluoromethylation of Alkenes with CF<sub>3</sub>Br and Atmospheric Oxygen
作者:Qiankun Li、Wu Fan、Deqian Peng、Bingyin Meng、Shaohan Wang、Rui Huang、Shihao Liu、Suhua Li
DOI:10.1021/acscatal.0c00498
日期:2020.4.3
The mild and efficient hydroxytrifluoromethylation of alkenes with bromotrifluoromethane (CF3Br) and atmospheric oxygen mediated by cobalt-tertiary amine is described. This reaction proceeds with broad substrate scope and good functional group compatibility. Mechanistic studies indicate that the reaction proceeds through a radical pathway, which is enabled by combination of the previously unexplored
Synergistic Lewis Acid and Photoredox-Catalyzed Trifluoromethylative Difunctionalization of Alkenes with Selenium Ylide-Based Trifluoromethylating Reagent
radical source in the presence of a synergistic catalyst including a Lewisacidscandium(III) trifluoromethanesulfonate (Sc(OTf)3) and a photoredox catalyst [fac-Ir(ppy)3] was described. Mechanistic studies showed that the role of Sc(OTf)3 in the reaction is to activate reagent 1 via Lewis acid–Lewis base interaction to form complex [Sc(OTf)3•3(1)], which was fully characterized by nuclear magnetic resonance