A convenient, oxidant-free protocol was developed for the ortho trifluoromethylation of aniline via picolinamide assisted Fe-promoted C–H functionalization under ultraviolet irradiation. In this transformation acetone essentially acted as both a solvent to dissolve reactants and a low-cost radical initiator to efficiently generate a CF3 radical from Langlois’ reagent. A broad substrate scope was tolerated
Visible-Light Mediated <i>ortho</i>-Trifluoromethylation of Aniline Derivatives
作者:Chao Tian、Qiyue Wang、Xueqi Wang、Guanghui An、Guangming Li
DOI:10.1021/acs.joc.9b01987
日期:2019.11.1
trifluoromethylation of anilinederivatives by using a low-cost and stable Langlois reagent (CF3SO2Na) as the "CF3" source has been developed. In contrast to previous reports, this strategy allowed access to elusive trifluoromethyl lactams. Furthermore, mechanism experiments revealed that a copper/photoredox dual catalytic mechanism enabled general trifluoromethylation of anilinederivatives.