期刊
ACS CATALYSIS
卷 12, 期 3, 页码 2045-2051出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c05484
关键词
hydrogen-atom transfer; photoredox catalysis; aminium radical; C-H alkylation; redox mediator
资金
- JSPS KAKENHI [20K22527, JP17H06450, JP21H05026]
- Grants-in-Aid for Scientific Research [20K22527] Funding Source: KAKEN
A series of HAT catalysts based on the DABCO structure were designed for photoinduced HAT catalysis, enabling efficient and site-selective C-H alkylation. The addition of substituents adjacent to a nitrogen atom on the catalyst further improved the site selectivity according to mechanistic studies.
A series of hydrogen-atom transfer (HAT) catalysts based on the readily available and tunable 1,4-diazabicyclo[2.2.2]-octane (DABCO) structure was designed, and their photoinduced HAT catalysis ability was demonstrated. The combination of our HAT catalyst with an acridinium-based organophotoredox catalyst enables efficient and site-selective C-H alkylation of substrates ranging from unactivated hydrocarbons to complex molecules. Notably, a HAT catalyst with additional substituents adjacent to a nitrogen atom further improved the site selectivity. Mechanistic studies suggested that the N-substituent of the catalyst plays a crucial role, assisting in the generation of a dicationic aminium radical as an active species for the HAT process.
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