sodium carbonate in methanol; water Ambient temperature;

1: 95 percent / triethylamine, 4-(dimethylamino)pyridine / acetonitrile / 2 h / Ambient temperature 2: 43 percent / borane / 1,2-dimethoxy-ethane / 0.33 h 3: 100 percent / Na2CO3 / H2O; methanol / Ambient temperature View Scheme

1: 95 percent / triethylamine, 4-(dimethylamino)pyridine / acetonitrile / 2 h / Ambient temperature 2: 43 percent / borane / 1,2-dimethoxy-ethane / 0.33 h 3: 100 percent / Na2CO3 / H2O; methanol / Ambient temperature View Scheme

1: 43 percent / borane / 1,2-dimethoxy-ethane / 0.33 h 2: 100 percent / Na2CO3 / H2O; methanol / Ambient temperature View Scheme