期刊
ACS CATALYSIS
卷 -, 期 -, 页码 3085-3092出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c05881
关键词
copper catalysis; single-electron transfer; 3-functionalized oxindole; oxygenation; divergent synthesis
We report a copper-catalyzed selective single-electron transfer strategy for the oxidative rearrangement of 3-substituted indoles using air as the terminal oxidant. This method provides a streamlined approach to access 3-hydroxyl-, 3-alkoxyl-, and 3-hygrogenous-2-oxindoles via a 3-radical-2-hydroxyl indoline intermediate. The protocol demonstrates high chemoselectivity, good functional group tolerance, and broad application potential in the modular synthesis of biologically 3-functionalized oxindole derivatives.
Oxidative rearrangement of 3-substituted indoles is a fundamental organic transformation for the synthesis of 2-oxindole scaffolds. However, this time-consuming and complex task produces a single type of product via two-electron oxidation using stoichiometric chemical oxidants. Herein, we report a unified and efficient copper-catalyzed selective single-electron transfer strategy for three oxidation reactions of 3-substituted indoles using air (O2) as the terminal oxidant, providing a streamlined and practical synthetic approach to access 3-hydroxyl-, 3-alkoxyl-, and 3hygrogenous-2-oxindoles via a 3-radical-2-hydroxyl indoline intermediate. This copper catalysis protocol demonstrates high chemoselectivity, good functional group tolerance, and broad application potential in the modular synthesis of biologically 3-functionalized oxindole derivatives.
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