1: 60 percent / tetrahydrofuran / -78 °C 2: 87 percent / LiAlH4 / diethyl ether / 1 h / 0 deg C to r.t. 3: 93 percent / p-toluenesulfonic acid / H2O; tetrahydrofuran / 0.5 h / Ambient temperature 4: 94 percent / triethylamine 5: 88 percent / m-chloroperbenzoic acid / tetrahydrofuran View Scheme