Fig. 3: Substrate scope of asymmetric cycloaddition of BCBs and benzosulfonimides.

Conditions: A (2.0 equiv), D (0.1 mmol), Ni(NTf₂)₂/L₃-PisEPh (1.2:1, 10 mol%) and 3 Å MS (25 mg) in CH₂Cl₂ (3.0 mL) at 10 °C under N₂ atmosphere and irradiation (20 W LED, λ_max = 365 nm). Yield of isolated product. Ee was determined by UPC².