Zusammenfassung
The visible-light-mediated activation of vinyl chlorides derived from alpha-chloro ethyl cinnamates via oxidative quenching of excited photocatalyst fac-Ir(ppy)(3) is described. Upon photoelectron transfer and chloride extrusion, the corresponding vinyl radical can be efficiently trapped by enol acetates, giving rise to synthetically useful 1,4-dicarbonyl compounds in good to excellent yields. ...
Zusammenfassung
The visible-light-mediated activation of vinyl chlorides derived from alpha-chloro ethyl cinnamates via oxidative quenching of excited photocatalyst fac-Ir(ppy)(3) is described. Upon photoelectron transfer and chloride extrusion, the corresponding vinyl radical can be efficiently trapped by enol acetates, giving rise to synthetically useful 1,4-dicarbonyl compounds in good to excellent yields. This transformation is distinguished by mild and environmentally benign reaction conditions and can be performed on a multigram scale, in sharp contrast to contrasting alpha-bromo ethyl cinnamates, which show low conversion under the various conditions applied.
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