sodium tetrahydroborate in isopropyl alcohol 10 h; Reflux;

1: 68 percent 2: 77 percent / phosphorus oxychloride / 1.83 h / 0 °C 3: 67 percent / p-toluenesulfonic acid / H2O; ethanol / 1.) reflux 1 h, 2.) heating 3.3 h View Scheme