1: 2,6-dimethylbenzeneamine With ethyl bromide; iodine; magnesium in tetrahydrofuran T=40 - 60°C; 2: propyl (1-propylpiperidine)-2-carboxylate in tetrahydrofuran T=40 - 70°C; 3: With hydrogenchloride in water; ethyl acetate T=5 - 15°C;