hydrogenchloride T=110 - 120°C; 2.5 h;

1: 54 percent / trimethyl borate, BH3*Me2S / tetrahydrofuran / 1.5 h / Ambient temperature 2: 86 percent / LiBr, p-TsOH / Ambient temperature 3: 1.) Mg, 1,2-dibromoethane / 1.) THF, reflux, 6.5 h, 2.) THF, RT, overnight 4: 90 percent / MnO2 / CHCl3 / 1 h / Heating 5: 51 percent / KOH, hydrazine hydrate / ethane-1,2-diol / 2 h / 200 °C 6: 58 percent / aq. HCl / 2.5 h / 110 - 120 °C View Scheme