pyridine; 4-(N,N-dimethlyamino)pyridine 0.5 h; Heating;

1: 87 percent / 1 M HCl / ethanol / 3 h / Heating 2: 63 percent / P2S5, S8, H2O / pyridine / 0.58 h / Heating 3: 90 percent / NH3 / ethanol / 72 h / 140 °C 4: 76 percent / 4-dimethylaminopyridine, pyridine / 0.5 h / Heating View Scheme