1: 2,6-Dibromopyridine With n-butyllithium in tetrahydrofuran; diethyl ether; hexane T=-95 - -90°C; Inert atmosphere; 2: trifluoro acetic acid methyl ester in tetrahydrofuran; diethyl ether; hexane T=-100 - -90°C; 0.5 h; Inert atmosphere;