1: 1.) NaH / 1.) THF 2: 54 percent / dibal / diethyl ether / -78 - 0 °C 3: 1.) Pyr-SO3, 2.) LiAlH4 / 1.) THF 4: 97 percent / 48percent aq. HF / acetonitrile / 0 °C View Scheme

1: 1.) NaH / 1.) THF 2: 54 percent / dibal / diethyl ether / -78 - 0 °C 3: 1.) Pyr-SO3, 2.) LiAlH4 / 1.) THF View Scheme

1: 1.) NaH / 1.) THF 2: 14 percent / dibal / diethyl ether / -78 - 0 °C View Scheme