1: 80 percent / MgSO4 / CH2Cl2 / 0.5 h 2: 1.) Et2AlCl / diethyl ether / 1.( r.t., 30 min; 2.) -78 deg C, 3 h 3: 89 percent / H2 / Pd(OH)2 / acetic acid; ethanol / 15 h / 760 Torr 4: 92 percent / 4.8 M HCl/dioxane / 20 h / Ambient temperature View Scheme