Direct C(sp
<sup>3</sup>
)−H Trifluoromethylation of Unactivated Alkanes Enabled by Multifunctional Trifluoromethyl Copper Complexes
作者:Geunho Choi、Geun Seok Lee、Beomsoon Park、Dongwook Kim、Soon Hyeok Hong
DOI:10.1002/anie.202012263
日期:2021.3
photoinduced reaction, the source of a trifluoromethyl radical as a hydrogen atom transfer reagent, and the source of a trifluoromethyl anion for functionalization. The reaction was initiated by the generation of reactive electrophilic carbon‐centered CF3 radical through photoinduced homolytic cleavage of bpyCu(CF3)3, followed by hydrogenabstraction from an unactivated C(sp3)−H bond. Comprehensive mechanistic
Copper-mediated chemoselective trifluoromethylation at the benzylic :position by the use of shelf-stable electrophilic trifluoromethylating reagents 3 in good to high yields under mild conditions is described for the first time. The generality of this trifluoromethylation for a wide variety of benzyl bromides facilitates the rapid creation of structural diversity of medicinal candidates in drug discovery.