carbon tetrabromide; triphenylphosphine in diethyl ether 3 h;

1: 92 percent / Jones reagent / acetone 2: oxalyl chloride / 0.5 h / Ambient temperature 3: N-hydroxypyridine-2-thione sodium salt, 4-dimethylaminopyridine, bromotrichloromethane / CCl4 / 0.25 h / Heating 4: 73 percent / lithium aluminium hydride / tetrahydrofuran / Heating View Scheme