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General conditions: 1a (0.8 mmol), 2a (0.2 mmol) and NaOH (0.4 mmol) in solvent (DMSO 1.0 mL + DMF 50.0 μL) were irradiated with blue LEDs (425 nm, 3 W × 2) for 24 h under an air atmosphere at 15 °C.
36 h.
