Fig. 6: Substrate scope of α-ketoesters and α-ketoamides.
From: Visible-light photoredox-catalyzed umpolung carboxylation of carbonyl compounds with CO2

The standard conditions were used, as shown in Fig. 3, entry 7. Isolated yields of corresponding carboxylic acids or methyl esters 6 are shown. aIsolated yield of corresponding benzoate ester upon work up with BzCl. Bz benzoyl.