1: 2-bromo-pyridine With isopropylmagnesium chloride in tetrahydrofuran T=0 - 20°C; 2 h; 2: With zinc dibromide in tetrahydrofuran T=20°C; 2.75 h; 3: 5-bromo-1,3-benzenedicarbonitrile With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=50°C; 6 h;