1: AgNTf2 / 1,2-dichloro-ethane / 1 h / 25 °C / Inert atmosphere 2: sodium tetrahydroborate / tetrahydrofuran; 1,2-dichloro-ethane / 12 h / 25 °C / Inert atmosphere View Scheme

1: N-bromosuccinmide; silver nitrate / acetone / 2 h / 20 °C / Inert atmosphere 2: CuSO4‵5H2O; 1,10-phenanthroline; potassium carbonate / toluene / 12 h / 80 °C / Inert atmosphere 3: AgNTf2 / 1,2-dichloro-ethane / 1 h / 25 °C / Inert atmosphere 4: sodium tetrahydroborate / tetrahydrofuran; 1,2-dichloro-ethane / 12 h / 25 °C / Inert atmosphere View Scheme

1: CuSO4‵5H2O; 1,10-phenanthroline; potassium carbonate / toluene / 12 h / 80 °C / Inert atmosphere 2: AgNTf2 / 1,2-dichloro-ethane / 1 h / 25 °C / Inert atmosphere 3: sodium tetrahydroborate / tetrahydrofuran; 1,2-dichloro-ethane / 12 h / 25 °C / Inert atmosphere View Scheme