Figure 2. Substrate scope on conjugations of N-protected amino acids and phenanthridines*.

^*Reaction conditions: under Ar atmosphere and irradiation of visible light, N-protected amino acid-OPht (1) (0.45 mmol for synthesis of 3a–p; 0.30 mmol for synthesis of the others), substituted 2-isocyanobiphenyl (2) (0.15 mmol), [Ru(bpy)₃]Cl₂ (1.5 μmol), DIPEA (0.06 mmol), K₂CO₃ (0.18 mmol), DMF (2.0 mL), temperature (rt, ~25 ^oC), time (1.5–6 h) in a sealed Schlenk tube. ^†Isolated yield. Boc = tert-butyloxycarbonyl. Bzl = benzyl. Cbz = benzyloxycarbonyl.