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. 2023 Feb 8;145(5):2794-2799.
doi: 10.1021/jacs.2c13502. Epub 2023 Jan 25.

Anaerobic Hydroxylation of C(sp3)-H Bonds Enabled by the Synergistic Nature of Photoexcited Nitroarenes

Joshua M Paolillo  1 , Alana D Duke  1 , Emma S Gogarnoiu  1 , Dan E Wise  1 , Marvin Parasram  1
Affiliations

Anaerobic Hydroxylation of C(sp3)-H Bonds Enabled by the Synergistic Nature of Photoexcited Nitroarenes

Joshua M Paolillo et al. J Am Chem Soc. .

Abstract

A photoexcited-nitroarene-mediated anaerobic C-H hydroxylation of aliphatic systems is reported. The success of this reaction is due to the bifunctional nature of the photoexcited nitroarene, which serves as the C-H bond activator and the oxygen atom source. Compared to previous methods, this approach is cost- and atom-economical due to the commercial availability of the nitroarene, the sole mediator of the reaction. Because of the anaerobic conditions of the transformation, a noteworthy expansion in substrate scope can be obtained compared to prior reports. Mechanistic studies support that the photoexcited nitroarenes engage in successive hydrogen atom transfer and radical recombination events with hydrocarbons, leading to N-arylhydroxylamine ether intermediates. Spontaneous fragmentation of these intermediates leads to the key oxygen atom transfer products.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Scheme 1
Scheme 1. C–H Hydroxylation Approaches
Scheme 2
Scheme 2. Mechanistic Studies
Scheme 3
Scheme 3. Proposed Mechanism
See this image and copyright information in PMC

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