Late-stage functionalization of peptides and medicinally relevant molecules^a.

^aReaction conditions: thioureas (0.3 mmol), peptides or drugs (0.6 mmol), K₂CO₃ (0.6 mmol), DP4 (1 mol%), in EtOH–H₂O (9 : 1; 3.0 mL), air atmosphere, a.t., 435–440 nm blue LED, isolated yields. 4.0 equiv. of K₂CO₃ was used for 74–78.