1,8-diazabicyclo[5.4.0]undec-7-ene in tetrahydrofuran 16 h; Heating;

Multi-step reaction with 3 steps 1: 89 percent / K2CO3 / tetrahydrofuran; methanol / 72 h / 20 °C2: 56 percent / 30 percent aq. H2O2 / acetic acid / 19 h / 20 °C3: 88 percent / NaBH4 / ethanol  

Multi-step reaction with 3 steps 1: DBU / tetrahydrofuran; propan-2-ol / 4 h / Ambient temperature2: p-TsOH / ethanol / 2 h / Heating3: NaOH / ethane-1,2-diol / 1 h / Heating