Photocatalytic carbocarboxylation of styrenes with CO2 for the synthesis of γ-aminobutyric esters
Organic & Biomolecular Chemistry(2021)
Abstract
Metal-free photoredox-catalyzed carbocarboxylation of various styrenes with carbon dioxide (CO2) and amines to obtain gamma-aminobutyric ester derivatives has been developed (up to 91% yield, 36 examples). The radical anion of (2,3,4,6)-3-benzyl-2,4,5,6-tetra(9H-carbazol-9-yl)benzonitrile (4CzBnBN) possessing a high reduction potential (-1.72 V vs. saturated calomel electrode (SCE)) easily reduces both electron-donating and electron-withdrawing group-substituted styrenes.
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Key words
photocatalytic carbocarboxylation,styrenes,synthesis
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