Table 2. Visible Light Photoredox-Catalyzed Reductive Coupling of α-Ketoesters^a.

^aReaction conditions: α-ketoester (0.3 mmol), HEH (0.165 mmol), Na₂-EY (2 mol %), THF/H₂O (6.0 mL, 95:5 v/v), room temperature, N₂, 10 W white LEDs, 2–4 h [monitored by thin-layer chromatography (TLC)].

^bdl and meso compounds can be separated by column chromatography.

^cAlcohol product was isolated.