1.1: TFA / 1 h / 20 °C 1.2: 0.798 mg / K2CO3 / acetone / 3.5 h / Heating 2.1: 100 percent / LiAlH4 / tetrahydrofuran / 0.5 h / 0 °C 3.1: PBr3 / tetrahydrofuran / 1 h / -78 °C 3.2: 72 percent / LiAlH4 / tetrahydrofuran / 1.92 h 4.1: 49 percent / PBr3 / tetrahydrofuran / 1 h / 60 °C 5.1: 99 percent / n-Bu3SnH / toluene / 12 h / Heating View Scheme