Journal
CHEMICAL SCIENCE
Volume 13, Issue 33, Pages 9560-9568Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2sc02606f
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Funding
- National Key Research and Development Program of China [2020YFA0210900]
- National Natural Science Foundation of China [21938001, 21878344]
- Guangdong Provincial Key RD Programme [2019B110206002]
- Local Innovative and Research Teams Project of the Guangdong Pearl River Talents Program [2017BT01C102]
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In this study, a biomimetic approach for the aerobic oxidation of C-sp(3)-H bonds was developed, which showed excellent efficiency and mild reaction conditions. The Cu-I-radical intermediate species generated from the catalyst played a critical role in the reaction rate, and the PINO mechanism was demonstrated for the C-sp(3)-H bond oxidation.
Developing highly efficient catalytic protocols for C-sp(3)-H bond aerobic oxidation under mild conditions is a long-desired goal of chemists. Inspired by nature, a biomimetic approach for the aerobic oxidation of C-sp(3)-H by galactose oxidase model compound (CuL)-L-II and NHPI (N-hydroxyphthalimide) was developed. The (CuL)-L-II-NHPI system exhibited excellent performance in the oxidation of C-sp(3)-H bonds to ketones, especially for light alkanes. The biomimetic catalytic protocol had a broad substrate scope. Mechanistic studies revealed that the Cu-I-radical intermediate species generated from the intramolecular redox process of (CuLH2)-L-II was critical for O-2 activation. Kinetic experiments showed that the activation of NHPI was the rate-determining step. Furthermore, activation of NHPI in the (CuL)-L-II-NHPI system was demonstrated by time-resolved EPR results. The persistent PINO (phthalimide-N-oxyl) radical mechanism for the aerobic oxidation of C-sp(3)-H bond was demonstrated.
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