1: 5-bromo-2-(trifluoromethyl)pyridine With n-butyllithium; diisopropylamine in tetrahydrofuran; hexanes T=-78 - -60°C; 0.0166667 h; Cooling with acetone-dry ice; 2: carbon dioxide in tetrahydrofuran; hexanes T=-78 - 20°C; 1 h; Cooling with acetone-dry ice; 3: With hydrogenchloride; sodium hydroxide more than 3 stages;