Table 3. Optimization studies of photoredox catalyzed trifluoromethylation of dipeptide ^a .

^aProduct % is the total yield of two products 5A and 5B (the average of two reactions), using biphenyl as an internal standard. Condition: 5 (0.01 mmol), cat. 4 (0–20 mol%), NaSO₂CF₃ (4–24 equivalents) in CH₃CN : 10% AcOH (aq) mixture (0.1 M).