1: tetrafluoroboric acid (50percent) / CH2Cl2; H2O / 7 h / Heating 2: 82 percent / NaHCO3 / tetrahydrofuran; H2O / 4 h / Heating View Scheme

Multi-step reaction with 2 steps 1: 80 percent / m-chloroperbenzoic acid / CH2Cl2 2: 68 percent / lithium diisopropylamide, hexamethylphosphortriamide / tetrahydrofuran / -78 °C  

With  tetrafluoroboric acid in  dichloromethane; water 7 h;  Heating;  Yield given;