Metal-Free Fluorination of C(sp3)–H Bonds Using a Catalytic N-Oxyl Radical
摘要:
A direct conversion of C(sp(3))-H bonds to C(sp(3))-F bonds has been developed. In this process, a catalytic N-oxyl radical generated from N,N-dihydroxypyromellitimide abstracts hydrogen from the C(sp(3))-H bond and Selectfluor acts to trap the resulting carbon radical to form the C(sp(3))-F bond. This simple metal-free protocol enables the chemoselective introduction of a fluorine atom into various aromatic and aliphatic compounds and serves as a powerful tool for the efficient synthesis of fluorinated molecules.
Photoinduced Transition‐Metal and External Photosensitizer Free Benzylic Fluorination of Unactivated Alkylarenes
作者:Jiawen Lai、Xuan Xiao、Shixing Shao、Shuping Wang、Jian Kan、Weiping Su
DOI:10.1002/chem.202401669
日期:2024.9.5
The photocatalytic monofluorination of unactivated alkylarenes, potentially initiated via a single-electron transfer, offers a highly efficient and selective pathway with excellent substrate compatibility, enabling the scale-up synthesis of pharmaceutical molecules. Omitting transition-metal catalysts and photosensitizers simplifies late-stage drug modification and the purification process.