1: pyridine; N-bromosuccinmide / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 2: tetrahydrofuran / -100 °C / Inert atmosphere 3: trifluoroacetic acid / dichloromethane / 1 h / 0 °C / Inert atmosphere 4: [Ru(bpyrz)3](PF6)2*2H2O / methanol; acetonitrile / 4 h / 20 °C / Air; Visible light; Irradiation View Scheme