1: 96 percent / BH3 / CBS catalyst R-oxazaborolidine (8) / tetrahydrofuran / 0.08 h 2: 92 percent / NaI / acetone / 72 h / Heating 3: 95 percent / Imidazole / dimethylformamide / 0.08 h / 23 °C 4: 88 percent / 6.5 h / 80 °C 5: 81 percent / KF, HCl / methanol / 2.5 h / 23 °C View Scheme