bromine; sodium acetate in acetic acid 0.25 h; Heating;

1: 83 percent / POCl3 / 0.5 h / Heating 2: 99 percent / Sodium azide / dimethylformamide / 18 h / Ambient temperature 3: 97 percent / H2 / 5percent Pd/C / ethanol / 10 h / 1520 Torr / Ambient temperature View Scheme

trichlorophosphate 0.5 h; Heating;