1: 2,6-(OPtBu2)2C5H3N With NiII chloride hexahydrate in ethanol T=20°C; 0.25 h; Inert atmosphere; 2: With lithium triethylborohydride in tetrahydrofuran; pentane T=20°C; 2 h; Inert atmosphere; 3: benzaldehyde Further stages;