1: 71 percent / HCl / dioxane / 12 h 2: 1.) sodium periodate, 2.) NaBH4 / 1.) H2O, dioxane, room temperature, 20 min, 2.) room temperature, 30 min View Scheme

1: 71 percent / HCl / dioxane / 12 h 2: 1.) sodium periodate, 2.) NaBH4 / 1.) H2O, dioxane, room temperature, 20 min, 2.) room temperature, 30 min 3: 90 percent / trifluoromethanesulfonic acid / acetone / 1 h / Ambient temperature View Scheme

1: 79 percent / KH / tetrahydrofuran / 1.) r.t., 0.5 h, 2.) -20 deg C, 0.5 h 2: 44 percent / H2 / 5percent Pd/C / diethyl ether / 2 h View Scheme