borane-THF in tetrahydrofuran T=-78°C; 1 h;

Multi-step reaction with 2 steps 1: 70 percent / BH3*THF / tetrahydrofuran / 1 h / -78 °C2: 89 percent / NaBH4 / methanol / 18 h / Ambient temperature  

With  borane-THF in  tetrahydrofuran T=0°C; 1 h;   

Multi-step reaction with 3 steps 1: 95 percent / NaH / tetrahydrofuran / 4 h / Heating2: 63 percent / titanium tetra-iso-propoxide / Heating3: 96 percent / K2CO3 / dimethylformamide / 16 h / Ambient temperature