in dichloromethane 1 h; Heating;

1: 88 percent / 30percent aq. H2O2, 20percent aq. NaOH / dimethylformamide / 0.5 h / Ambient temperature 2: 1.) NaH / 1.) DMF, RT, 5 min, 2.) DMF, 50 deg C, 17 h 3: 64 percent / NaBH4 / ethanol / 1 h / Ambient temperature 4: 64 percent / CH2Cl2 / 1 h / Heating View Scheme

1: 66 percent / acetic anhydride / 0.5 h / 50 °C 2: 88 percent / 30percent aq. H2O2, 20percent aq. NaOH / dimethylformamide / 0.5 h / Ambient temperature 3: 1.) NaH / 1.) DMF, RT, 5 min, 2.) DMF, 50 deg C, 17 h 4: 64 percent / NaBH4 / ethanol / 1 h / Ambient temperature 5: 64 percent / CH2Cl2 / 1 h / Heating View Scheme