trichlorophosphate 1.) 0-5 deg C, 15 min, 2.) 110-120 deg C, 2.5 h;

1: 98 percent / NaH / tetrahydrofuran / 18 h / 80 °C 2: 71 percent / 1.) POCl3 / 1.) 0-5 deg C, 15 min, 2.) 110-120 deg C, 2.5 h View Scheme

1: 79 percent / HCl(g) / ethanol / 0.5 h / Heating 2: 98 percent / NaH / tetrahydrofuran / 18 h / 80 °C 3: 71 percent / 1.) POCl3 / 1.) 0-5 deg C, 15 min, 2.) 110-120 deg C, 2.5 h View Scheme