1: 70 percent / 40percent aq. MeNH2 / 72 h / Ambient temperature 2: 63 percent / LiAlH4 / tetrahydrofuran / 3 h / Heating 3: 83 percent / 72 h / Ambient temperature View Scheme

1: 1) Na / 1) THF, 0 deg C, 2 h, 2) -75 deg C, 18 h, THF 2: 70 percent / 40percent aq. MeNH2 / 72 h / Ambient temperature 3: 63 percent / LiAlH4 / tetrahydrofuran / 3 h / Heating 4: 83 percent / 72 h / Ambient temperature View Scheme

1: 63 percent / LiAlH4 / tetrahydrofuran / 3 h / Heating 2: 83 percent / 72 h / Ambient temperature View Scheme

72 h; Ambient temperature;