1: 2.) acetic anhydride / 1.) benzene, 1 h, reflux; 2.) 5 h, reflux 2: lithium aluminium hydride View Scheme

1: 2.) acetic anhydride / 1.) benzene, 1 h, reflux; 2.) 5 h, reflux 2: 94 percent / boron tribromide / CH2Cl2 / 2 h / Ambient temperature 3: 77 percent / potassium carbonate / dimethylformamide 4: 78 percent / LiAlH4 / tetrahydrofuran / Heating 5: 85 percent / H2 / 10percent Pd-C / acetic acid View Scheme