1: 88 percent / diborane / tetrahydrofuran / 15 h / Ambient temperature 2: 74 percent / MnO2 / CHCl3 / 5 h / Heating 3: ethanol / 0.5 h / Ambient temperature View Scheme

1: 74 percent / MnO2 / CHCl3 / 5 h / Heating 2: ethanol / 0.5 h / Ambient temperature View Scheme

in ethanol 0.5 h; Ambient temperature; Yield given;