期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 30, 页码 8828-8832出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201501556
关键词
diamines; photosensitizers; pinacol coupling; proton-coupled electron transfer; radical anions
Ketyl radical and amino radical anions, valuable reactive intermediates for CC bond-forming reactions, are accessible through a CO/CNR umpolung. However, their utilization in catalysis remains largely underdeveloped owing to the high reduction potential of carbonyl compounds and imines. In the context of photoredox catalysis, tertiary amines are commonly employed as sacrificial co-reducing agents. Herein, an additional role of the amine is proposed, in which it is essential for the organocatalytic substrate activation. The combination of photoredox catalysis and carbonyl/imine activation enables the reductive coupling of aldehydes, ketones, and imines under mild reaction conditions.
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