Photoredox Catalysis of Aromatic ß-Ketoesters for in Situ Production of Transient and Persistent Radicals for Organic Transformation.
Angew Chem Int Ed Engl
; 59(13): 5365-5370, 2020 Mar 23.
Article
em En
| MEDLINE
| ID: mdl-31957949
ABSTRACT
Radical formation is the initial step for conventional radical chemistry. Reported herein is a unified strategy to generate radicals in situ from aromatic ß-ketoesters by using a photocatalyst. Under visible-light irradiation, a small amount of photocatalyst fac-Ir(ppy)3 generates a transient α-carbonyl radical and persistent ketyl radical in situ. In contrast to the well-established approaches, neither stoichiometric external oxidant nor reductant is required for this reaction. The synthetic utility is demonstrated by pinacol coupling of ketyl radicals and benzannulation of α-carbonyl radicals with alkynes to give a series of highly substituted 1-naphthols in good to excellent yields. The readily available photocatalyst, mild reaction conditions, broad substrate scope, and high functional-group tolerance make this reaction a useful synthetic tool.
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MEDLINE
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En
Ano de publicação:
2020
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Article