borane-THF in tetrahydrofuran 2 h; Ambient temperature;

1: 60 percent / KOH / aq. ethanol / 96 h / Heating 2: 92 percent / 1 M BH3*THF / tetrahydrofuran / 2 h / Ambient temperature View Scheme

1: 61 percent / NaH / dimethylsulfoxide; diethyl ether 2: 60 percent / KOH / aq. ethanol / 96 h / Heating 3: 92 percent / 1 M BH3*THF / tetrahydrofuran / 2 h / Ambient temperature View Scheme