1: 2,6-Dibromopyridine With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 0.5 h; 2: formic acid methyl ester in tetrahydrofuran T=-78°C; 2 h; 3: With ammonium chloride in tetrahydrofuran; water

1: 2,6-Dibromopyridine With n-butyllithium in tetrahydrofuran T=-78°C; 2: N,N-dimethyl-formamide in tetrahydrofuran Further stages.;

sodium chlorite; sodium dihydrogenphosphate; 2-methyl-but-2-ene in water; tert-butyl alcohol T=20°C; 2 h;