1: carbon tetrabromide; triphenylphosphine / dichloromethane / 2 h / 0 °C / |Inert atmosphere 2: tri-n-butyl-tin hydride; 2,2'-azo-bisisobutyronitrile / benzene / 0.5 h / 80 °C / |Inert atmosphere 3: ethanol; sodium tetrahydroborate / 1 h / |Inert atmosphere View Scheme