1: 30percent aq. H2O2 / acetic acid / 12 h / 80 °C 2: Ac2O / 1 h / Heating 3: 1.) NaH / 1.) DMF, 50 deg C, 0.5 h, 2.) DMF, 50 deg C, 2 h View Scheme

sodium hydride 1.) DMF, 50 deg C, 0.5 h, 2.) DMF, 50 deg C, 2 h; Yield given. Multistep reaction;