Photocatalyzed Benzylic Fluorination: Shedding “Light” on the Involvement of Electron Transfer
作者:Steven Bloom、Michael McCann、Thomas Lectka
DOI:10.1021/ol503094m
日期:2014.12.19
The photocatalyzed oxidation of benzylic compounds by 1,2,4,5-tetracyanobenzene (TCB) in the presence of Selectfluor provides a synthetically efficient route to electron deficient, less substituted, and otherwise inaccessible benzylic fluorides. The virtue of this system is multifold: it is metal-free and mild, and the reagents are inexpensive. Mechanistically, the data suggest the intimate formation of intermediate radical cations in the key radical forming step, as opposed to a concerted hydrogen atom transfer process.