fig4

Figure 4. The scope of 1-diazonaphthalen-2(1H)-ones. Standard conditions: 1 (0.1 mmol), 2 (0.2 mmol), Pd₂(dba)₃·CHCl₃ (5 mol%) and L8(20 mol%) in 2.0 mL anhydrous DCM at rt under the irradiation of 6 W blue LEDs for 24 h. Isolated yields. ^aChiral ligand L9(10 mol%) was used instead of L8. ee: Enantiomer excess; dr: diastereoisomer ratio; dba: dibenzylideneacetone; DCM: dichloromethane; rt: room temperature; LEDs: light-emitting diodes.