Abstract
The direct aerobic oxidation of secondarty C(sp3)-H bonds was achieved in the presence of N-hydroxyphthalimide (NHPI) and cerium ammonium nitrate (CAN) under mild conditions. Various benzylic methylenes could be oxidized to carbonyl compounds in satisfied selectivity while saturated cyclic alkanes could be further oxidized to the corresponding lactones with the catalytic system. Remarkably, 25% of isochroman was converted to corresponding ketone with a selectivity of 96%. The reaction was initiated by hydrogen atom abstraction from NHPI by cerium and nitrates under oxygen atmosphere to form PINO radicals. 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO) addition experiments showed that the oxidation proceeded via a complex radical chain mechanism and an ion pathway.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 21573196), the Fundamental Research Funds of the Central Universities, and the National High Technology Research and Development Program (863 Program) of China (Grant No. SS2015AA020601). L. Wang gratefully acknowledge the financial support for this research by the Zhejiang Province Postdoctoral Science Foundation (No. ZJ2020159).
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LW: Conceptualization, Methodology, Investigation, Formal analysis, Data curation, Writing-Original Draft. YZ: Validation, Formal analysis, Data curation, Writing-Reviewing & Editing. HY: Writing-Reviewing & Editing. RD: Writing-Reviewing & Editing. JY: Writing-Reviewing & Editing, Supervision. HL: Writing-Reviewing & Editing, Supervision.
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Wang, L., Zhang, Y., Yuan, H. et al. Selective Aerobic Oxidation of Secondary C (sp3)-H Bonds with NHPI/CAN Catalytic System. Catal Lett 151, 1663–1669 (2021). https://doi.org/10.1007/s10562-020-03406-6
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DOI: https://doi.org/10.1007/s10562-020-03406-6