1: 73 percent / water / aq. NaOH / dioxane / 18 h / 110 °C 2: 83 percent / PCC, NaOAc / CH2Cl2 / 2.5 h / Ambient temperature 3: 58 percent / BF3*MeOH / 17 h / Ambient temperature 4: BBr3 / CH2Cl2 / 18 h / -78 °C 5: 40 percent / Fremy's salt, KH2PO4 / H2O; acetone / 0.5 h / Ambient temperature View Scheme

1: 73 percent / water / aq. NaOH / dioxane / 18 h / 110 °C 2: 83 percent / PCC, NaOAc / CH2Cl2 / 2.5 h / Ambient temperature 3: 58 percent / BF3*MeOH / 17 h / Ambient temperature View Scheme

With  sodium hydroxide; water in  1,4-dioxane  Heating;   

Multi-step reaction with 2 steps 1: 73 percent / water / aq. NaOH / dioxane / 18 h / 110 °C2: 83 percent / PCC, NaOAc / CH2Cl2 / 2.5 h / Ambient temperature