1: 60 percent / pyridinium p-toluenesulfonate / CH2Cl2 / 5 h / Ambient temperature 2: 90 percent / CeCl3*7H2O, NaBH4 / methanol / 0.17 h / 0 °C 3: 87 percent / diethyl azodicarboxylate, triphenylphosphine / tetrahydrofuran / 5 h / Ambient temperature 4: 100 percent / potassium carbonate / methanol / 2 h / Ambient temperature 5: 100 percent / 4-dimethylaminopyridine, pyridine / CH2Cl2 / 1 h / 0 °C 6: 96 percent / acetic acid, water / tetrahydrofuran / 24 h / Ambient temperature 7: 91 percent / PCC, sodium acetate, Celite / CH2Cl2 / 1 h / Ambient temperature View Scheme