1: 3-bromo-pyridine With n-butyllithium; zinc(II) chloride−TMEDA in tetrahydrofuran; toluene T=-78°C; 2: 2,6-Dibromopyridine With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran; toluene T=20°C; 24 h;