1: 78 percent / LiBH4 / tetrahydrofuran / 0.5 h / 20 °C 2: 86 percent / LiCl, MsCl, s-collidine / dimethylformamide / 2 h / 0 - 20 °C 3: 79 percent / tetrahydrofuran / 12 h / Ambient temperature 4: 91 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 3 h / 20 °C 5: 73 percent / TPAP, NMO, 4 Angstroem sieves / CH2Cl2 / 3 h 6: 85 percent / tetrahydrofuran; hexane / 2 h / 0 - 20 °C View Scheme

1: 78 percent / LiBH4 / tetrahydrofuran / 0.5 h / 20 °C 2: 86 percent / LiCl, MsCl, s-collidine / dimethylformamide / 2 h / 0 - 20 °C 3: 79 percent / tetrahydrofuran / 12 h / Ambient temperature 4: 91 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 3 h / 20 °C 5: 73 percent / TPAP, NMO, 4 Angstroem sieves / CH2Cl2 / 3 h View Scheme