Trifluoromethylation of Unactivated Alkenes with Me<sub>3</sub>SiCF<sub>3</sub> and <i>N</i>-Iodosuccinimide
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.9b00332
日期:2019.3.1
A novel approach to the trifluoromethylation of unactivated alkenes is presented. This reaction is promoted by N-iodosuccinimide (NIS) undervisiblelight irradiation without the need for photocatalysts. The mild conditions allow the direct synthesis of useful trifluoromethylated (E)-alkenes from readily available alkene feedstocks with excellent functional group tolerability. In addition, using easy-to-handle
Visible-Light-Induced Trifluoromethylation of Unactivated Alkenes with Tri(9-anthryl)borane as an Organophotocatalyst
作者:Jisu Moon、Yu Kyung Moon、Do Dam Park、Sukyung Choi、Youngmin You、Eun Jin Cho
DOI:10.1021/acs.joc.9b01624
日期:2019.10.18
applied as an organophotocatalyst for the visible-light-induced trifluoromethylation of unactivated alkenes with CF3I. The mild reaction conditions tolerated a variety of functional groups, and the reaction could be extended to perfluoroalkylations with C3F7I and C4F9I. Mechanistic studies revealed that the photoredox catalysis involves an oxidative quenching pathway.
A visible-light-mediated hydrotrifluoromethylation of unactivatedalkenes that uses the Umemoto reagent as the CF(3) source and MeOH as the reductant is disclosed. This effective transformation operates at room temperature in the presence of 5 mol % Ru(bpy)(3)Cl(2); the process is characterized by its operational simplicity and functional group tolerance.
Cooperative catalysis involving copper(ii) complex bearing redox ligands allows generation of CF˙3 radicals through ligand-based SET while metallic oxidation state is preserved.
铜(II)配合物参与的合作催化可以通过氧化还原配体产生CF˙3自由基,同时保持金属的氧化态。
Hydrotrifluoromethylation of Unactivated Alkenes and Alkynes Enabled by an Electron-Donor–Acceptor Complex of Togni’s Reagent with a Tertiary Amine
作者:Yuanzheng Cheng、Shouyun Yu
DOI:10.1021/acs.orglett.6b01301
日期:2016.6.17
and a tertiary amine has been introduced. The existence of this EDA complex was supported by NMR titration experiments. The hydrotrifluoromethylation of unactivated aliphatic alkenes and alkynes enabled by this EDA complex has also been developed. This hydrotrifluoromethylation protocol is operationally simple and promoted by a tertiary amine.