1: 1) POCl3, DMF, 2) aq.HClO4 / 1) cooling, 15-16 h, 2) 0 deg C, 10-15 min 2: 100 percent / H2O / dimethylformamide / 0.08 h / Heating 3: 100 percent / NH3 / diethyl ether / 20 h 4: 100 percent / POCl3, DMF / 16 h / Ambient temperature View Scheme

1: 1) POCl3, DMF, 2) aq.HClO4 / 1) cooling, 15-16 h, 2) 0 deg C, 10-15 min 2: 100 percent / H2O / dimethylformamide / 0.08 h / Heating View Scheme

With  water in  N,N-dimethyl-formamide T=15 - 20°C; 0.166667 h;   

With  perchloric acid; N,N-dimethyl-formamide; trichlorophosphate  1) cooling, 15-16 h, 2) 0 deg C, 10-15 min;  Yield given. Multistep reaction;