1: 2-bromo-5-fluoropyridine With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; 2: 2-cyclohexyloxy-4,4,5,5-tetramethyl-[1,3,2]dioxaborolan in tetrahydrofuran; hexane T=-78 - 0°C;