1: With [2,2']bipyridinyl; sodium tetrahydroborate; cobalt(II) dibromide in ethanol T=0 - 20°C; 3 h; 2: With water in ethanol 1 h;

1.1: sodium azide; ammonium chloride / water; methanol / 23 h / 70 °C 2.1: pyridine / 21 h / 0 - 20 °C / Inert atmosphere 3.1: [2,2']bipyridinyl; sodium tetrahydroborate / cobalt(II) dibromide / ethanol / 3 h / 0 - 20 °C 3.2: 1 h View Scheme

1.1: pyridine / 21 h / 0 - 20 °C / Inert atmosphere 2.1: [2,2']bipyridinyl; sodium tetrahydroborate / cobalt(II) dibromide / ethanol / 3 h / 0 - 20 °C 2.2: 1 h View Scheme