1: C11H17BrN2 With tert.-butyl lithium in tetrahydrofuran; pentane T=-78°C; 0.25 h; 2: tri-isopropoxy-borane in tetrahydrofuran; pentane T=-78 - 20°C; 3: With water; sodium hydrogencarbonate in tetrahydrofuran; pentane T=20°C;