Pyridine <i>N</i>-oxides as HAT reagents for photochemical C–H functionalization of electron-deficient heteroarenes
作者:Łukasz W. Ciszewski、Dorota Gryko
DOI:10.1039/d2cc03772f
日期:——
PyridineN-oxides have only recently marked their presence in the photocatalysis field, mainly serving as oxypyridinium salt precursors. Herein, their unique reactivity as a hydrogen atom transfer reagent in photochemical, Minisci-type alkylation of electron-deficient heteroarenes is unveiled. The formation of an EDA complex between a heterocyclic substrate and N-oxide precludes the need for a photocatalyst
Oxidase‐Type C−H/C−H Coupling Using an Isoquinoline‐Derived Organic Photocatalyst
作者:Lei Zhang、Björn Pfund、Oliver S. Wenger、Xile Hu
DOI:10.1002/anie.202202649
日期:2022.5.9
An isoquinoline-derived diaryl ketone-type photocatalyst was designed and synthesized. This photocatalyst enabled visible-light-mediated dehydrogenative cross-coupling of heteroarenes with alkanes and aldehydes using air as the sole oxidant. An unconventional mechanism with “self-quenching” to generate an isoquinoline N-radical cation to trigger hydrogen atom transfer (HAT) is involved, according to