Fig. 5: Scope of enantioselective B − H insertion with symmetric diazo compounds.

Conditions: ^a 2-arylpyridine-borane 1 (0.1 mmol, 1.0 equiv), symmetric diaryl diazomethane 2 (0.12 mmol, 1.2 equiv), Cu(MeCN)₄PF₆ (5 mol%), L1 (6 mol%), DCM (1 mL) at -35 °C for 9 h. ^b Isolated yield.