1: 83.6 percent / BH3*THF / tetrahydrofuran / Ambient temperature 2: 1.) NaNO2, AcOH, 2.) NaOH / 1.) H2O, 0 deg C, 10 min, rt, 15 min, 2.) MeOH, H2O, rt, 10 min 3: 80 percent / PCC / CH2Cl2 / 5 h / Ambient temperature View Scheme