Abstract
The C(sp3)−H functionalization of naturally abundant alkanes is of great importance, whereas C−H bond oxidation of aryl ethers in a redox-neutral and environmental-friendly manner remains a challenge. Herein, we report a novel method of visible-light-driven C(sp3)−H bond oxidation of aryl ethers selectively into ester products using oxygen as the oxidant. During the photocatalytic reaction using Mes-10-phenyl-Acr+−BF4− catalyst, chlorine radicals are generated from a wide variety of chloride sources and can effectively activate aryl ether C(sp3)−H bonds into alkyl radicals through the hydrogen atom transfer process. Aryl ethers with different substituents can be oxidized to esters in good to excellent yields. This work presents a new photocatalytic strategy for C(sp3)−H oxidation of aryl ethers in a convenient and green manner.
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