triethylamine in benzene 1 h, 5 deg C; 1 h, room temperature;

1: 42 percent / NaOH / H2O / 30 h / Heating 2: 30 percent / n-butylamine / acetic acid / 4 h / Heating 3: SOCl2 / 0.33 h / Heating 4: 55 percent / triethylamine / benzene / 1 h, 5 deg C; 1 h, room temperature View Scheme

1: 30 percent / n-butylamine / acetic acid / 4 h / Heating 2: SOCl2 / 0.33 h / Heating 3: 55 percent / triethylamine / benzene / 1 h, 5 deg C; 1 h, room temperature View Scheme

1: SOCl2 / 0.33 h / Heating 2: 55 percent / triethylamine / benzene / 1 h, 5 deg C; 1 h, room temperature View Scheme