期刊
ACS CATALYSIS
卷 12, 期 24, 页码 15707-15714出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c04741
关键词
alkylation; cobalt; dihydropyridine; heterocycles; radical reaction
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2022R1A4A1018930]
- [2020R1A2C3005357]
- National Research Foundation of Korea [2022R1A4A1018930] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, a cobalt(II)-catalyzed method for C-H alkylation and acylation of N-heterocycles using 1,4-dihydropyridines (DHPs) as alkylating and acylating agents was reported. The combination of KBrO3 and a Co(II) catalyst successfully generated alkyl and acyl radicals from DHPs. This method was applicable to various heterocycles and demonstrated selectivity in modifying drug candidates and synthesizing bioactive molecules on a gram scale.
The rapid incorporation of alkyl and acyl groups into C-H bonds of N-heterocycles is in demand for the development of lead candidates in drug discovery. Herein, we report the cobalt(II)-catalyzed C-H alkylation and acylation of N-heterocycles with 1,4-dihydropyridines (DHPs) as alkylating and acylating agents. Notably, a combination of KBrO3 and a Co(II) catalyst was successfully employed for the generation of alkyl and acyl radicals from DHPs. A series of heterocycles, including azauracils, quinoxalinones, pyrazinones, pyridones, quinolones, quinazolinones, xanthines, chromones, and azine N-oxides, were compatible under the developed conditions. The applicability of the developed protocol in challenging contexts is highlighted by the selective modification of drug candidates as well as the gram-scale synthesis of bioactive molecules. Combined mechanistic investigations aided the elucidation of a plausible reaction mechanism.
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