1: pyridine-3,5-dicarboxylic acid With sodium hydride in DMF (N,N-dimethyl-formamide) T=0°C; 1 h; 2: benzyl bromide in DMF (N,N-dimethyl-formamide) T=60°C; 2 h;

sulfuric acid in water 2 h; Heating / reflux;

ammonia in water T=90°C; 6 h;