1: tri-isopropoxy-borane; 3-methoxybenzylnitrile With 2,2,6,6-tetramethylpiperidinyl-lithium in tetrahydrofuran; hexane T=-78 - 20°C; 2: 3-hydroxy-2,2-dimethylpropanol in tetrahydrofuran; hexane T=20°C; 1 h;