期刊
ADVANCED SYNTHESIS & CATALYSIS
卷 363, 期 11, 页码 2806-2812出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.202100168
关键词
Visible-light-induced; 2-Arylacylpyridine N-oxides; Fluorescein dimethylammonium; Decarboxylation acylation; Green synthetic strategy
资金
- Foundation for Engineering Technology Talent Training from Ministry of Education of China [19JDGC005]
- Research Project of the Natural Science Foundation of Heilongjiang Province of China [B2018012]
- College Students Innovative Entrepreneurial Training Plan Program of China [202010212013]
This study reports the development of a visible-light-induced catalytic system for the decarboxylative acylation of pyridine N-oxides with alpha-oxocarboxylic acids, using fluorescein dimethylammonium as a new type of photocatalyst. A series of 2-arylacylpyridine N-oxides were selectively synthesized by controlling the polarity of the reaction solvent. The disclosed catalytic system provides a green synthetic strategy for decarboxylative acylation without the use of additional oxidants or metal catalysts.
Herein, the development of a visible-light-induced catalytic system to achieve the decarboxylative acylation of pyridine N-oxides with alpha-oxocarboxylic acids, at room temperature and using the organic dye fluorescein dimethylammonium as a new type of photocatalyst, is reported. A series of 2-arylacylpyridine N-oxides were selectively synthesized in moderate to good yields by controlling the polarity of the reaction solvent. The developed strategy was successfully applied in the synthesis of an important intermediate of the drug, acrivastine, on a gram scale. Notably, this is the first time that fluorescein dimethylammonium has been used to catalyze the Minisci-type C-H decarboxylative acylation reaction. The mechanism of decarboxylative acylation was studied by capturing adducts of acyl radicals and 1,1-diphenylethylene to confirm a radical mechanism. The disclosed catalytic system provides a green synthetic strategy for decarboxylative acylation without the use of additional oxidants or metal catalysts.
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