boron trifluoride diethyl etherate; water in acetone 10 h; Ambient temperature;

With  lithium aluminium tetrahydride in  tetrahydrofuran T=0°C; 0.5 h;   

Multi-step reaction with 5 steps 1: 63 percent / NaNO2 / dimethylformamide / 7 h / Ambient temperature2: 74 percent / Amberlist A-21 / 16 h / Ambient temperature3: 76 percent / pyridinium chlorochromate, 3 A molecular sieves / CH2Cl2 / 24 h / Ambient temperature4: 97 percent / methanol / 10 h / Ambient temperature5: 95 percent / LiAlH4 / tetrahydrofuran / 0.5 h / 0 °C  

Multi-step reaction with 4 steps 1: 74 percent / Amberlist A-21 / 16 h / Ambient temperature2: 76 percent / pyridinium chlorochromate, 3 A molecular sieves / CH2Cl2 / 24 h / Ambient temperature3: 97 percent / methanol / 10 h / Ambient temperature4: 95 percent / LiAlH4 / tetrahydrofuran / 0.5 h / 0 °C  

Multi-step reaction with 3 steps 1: 76 percent / pyridinium chlorochromate, 3 A molecular sieves / CH2Cl2 / 24 h / Ambient temperature2: 97 percent / methanol / 10 h / Ambient temperature3: 95 percent / LiAlH4 / tetrahydrofuran / 0.5 h / 0 °C  

Multi-step reaction with 2 steps 1: 97 percent / methanol / 10 h / Ambient temperature2: 95 percent / LiAlH4 / tetrahydrofuran / 0.5 h / 0 °C