hydrogenchloride in pyridine T=0°C; 4 h; Title compound not separated from byproducts;

1: 90 percent / SOCl2 / CCl4 / 1 h / Heating 2: 65 percent / 2.) aq. HCl / CHCl3 / 1.) reflux, 6 h; 2.) reflux, 6 h 3: 2.) aq. HCl / pyridine / 4 h / 0 °C View Scheme

1: 65 percent / 2.) aq. HCl / CHCl3 / 1.) reflux, 6 h; 2.) reflux, 6 h 2: 2.) aq. HCl / pyridine / 4 h / 0 °C View Scheme

1: 1.) Mg turnings / 1.) THF, -10 deg C, 1 h; 2.) -60 deg C 2: 90 percent / SOCl2 / CCl4 / 1 h / Heating 3: 65 percent / 2.) aq. HCl / CHCl3 / 1.) reflux, 6 h; 2.) reflux, 6 h 4: 2.) aq. HCl / pyridine / 4 h / 0 °C View Scheme