1: pyridin-4-yl methyl amine With n-butyllithium in tetrahydrofuran; hexane T=-10 - 0°C; Inert atmosphere; 2: carbon disulfide in tetrahydrofuran; hexane T=0 - 20°C; Inert atmosphere; 3: With iodine; potassium iodide in tetrahydrofuran; hexane; water T=0°C; Inert atmosphere;