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

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

sodium tetrahydroborate; trimethylstannyl chloride 1) EtOH, below 15 deg C, irradiation, 3 h, 2) MeCOMe, 15 min; Multistep reaction;