1: 1 h / Heating 2: 1) NaBH4, Sn(CH3)3Cl / 1) EtOH, below 15 deg C, irradiation, 3 h, 2) MeCOMe, 15 min 3: 25percent aq. NaOH 4: LiAlH4 / diethyl ether / 2.5 h / Heating 5: fuming sulfuric acid, 96percent aq. H2SO4 / 2 h / 20 °C 6: LiAlH4 / diethyl ether / 2 h / Heating 7: pyridinium fluorochromate / CH2Cl2 / Ambient temperature View Scheme

1: 1 h / Heating 2: 1) NaBH4, Sn(CH3)3Cl / 1) EtOH, below 15 deg C, irradiation, 3 h, 2) MeCOMe, 15 min 3: 25percent aq. NaOH View Scheme

1: 91 percent / diethyl ether / 1 h / -3 °C / with a vibromixer 2: 55 percent / various solvent(s) / 130 °C View Scheme

1: 1 h / Heating 2: 1) NaBH4, Sn(CH3)3Cl / 1) EtOH, below 15 deg C, irradiation, 3 h, 2) MeCOMe, 15 min View Scheme