1: α-bromo-methylpyridine With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran; diethyl ether; pentane T=-115°C; Inert atmosphere; 2: chloro-diphenylphosphine in tetrahydrofuran; diethyl ether; pentane T=-70°C; Inert atmosphere;