Table 2. Influence of Substituents on the Catalytic Enantioselective [2 + 2] Photocycloaddition Reactions between 2(1H)-Quinolones and Olefinsa.
Irradiation times varied between 6 and 18 h. The reactions were performed on a scale of 25 μmol. For detailed information, see the Supporting Information.
The reaction was performed on a scale of 0.15 mmol.