hydrogen fluoride in water; acetonitrile T=45°C; 8 h;

Multi-step reaction with 3 steps 1: 75 percent / 1,3-dicyclohexylcarbodiimide, 4-(dimethylamino)pyridine / CH2Cl2 / 72 h / Ambient temperature2: 10percent aq. HCl / tetrahydrofuran / 4 h / 50 °C3: pyridinium chlorochromate, aluminum oxide / CH2Cl2 / 8 h / Ambient temperature  

Multi-step reaction with 2 steps 1: 10percent aq. HCl / tetrahydrofuran / 4 h / 50 °C2: pyridinium chlorochromate, aluminum oxide / CH2Cl2 / 8 h / Ambient temperature  

Multi-step reaction with 5 steps 1: 42 percent / aluminum oxide / toluene / 0.5 h / Heating2: 77 percent / p-toluenesulfonic acid monohydrate / methanol / 12 h / Ambient temperature3: 75 percent / 1,3-dicyclohexylcarbodiimide, 4-(dimethylamino)pyridine / CH2Cl2 / 72 h / Ambient temperature4: 10percent aq. HCl / tetrahydrofuran / 4 h / 50 °C5: pyridinium chlorochromate, aluminum oxide / CH2Cl2 / 8 h / Ambient temperature