1: 1.) Et3N, MgSO4, 2.) LiAlH4 / 1.) THF, RT, overnight, 2.) THF, reflux, 1.5 h 2: BBr3 / CH2Cl2 / 23 °C 3: NaH / diethyl ether View Scheme

1.1: MgSO4 / tetrahydrofuran 1.2: 90 percent / LiAlH4 / tetrahydrofuran 2.1: BBr3 / CH2Cl2 / 3 h / 20 °C 3.1: NaH / tetrahydrofuran / 0.17 h / 20 °C 3.2: 3.22 g / tetrahydrofuran / 4.5 h View Scheme