n-butyl-magnesium chloride; 1,4-diaza-bicyclo[2.2.2]octane; lead(II) bis(pentane-2,4-dionate) in tetrahydrofuran T=25°C; 20 h;

With  1.) CuCN 1.) ether, -80 deg C, 30 min at -30 deg C; 2.) ether, -60 deg C, 0.5 h;  Yield given. Multistep reaction;