iron; ammonium chloride in tetrahydrofuran; ethanol; water 1 h; Heating / reflux;

1.1: AlCl3, aluminium chloride; sodium tetrahydroborate / ethyl acetate; methanol / 4 h / 0 °C 2.1: hydrogen / palladium 10 on activated carbon / methanol / 16 h / 20 °C / 2068.65 Torr 3.1: phosphorus oxytribromide / N,N-dimethyl-formamide / 0.33 h / Reflux 3.2: pH 7 - 8 View Scheme