1: 90 percent / triethylamine / tetrahydrofuran / Ambient temperature; overnight 2: 96 percent / H2 / 5percent Pd-on-carbon / acetic acid; ethanol / 1.5 h / 40 °C / 2280 Torr 3: 1M diborane / tetrahydrofuran / 1 h / Heating View Scheme