1: 57 percent / BH3 / tetrahydrofuran / 13 h / -15 °C 2: 92 percent / NEt3, 4-(dimethylamino)pyridine / CH2Cl2 / 72 h / Ambient temperature 3: 77 percent / NaH / hexamethylphosphoric acid triamide / 0 deg C, 1 h; room temperature, 16 h 5: 75 percent / toluene / 40 h / 130 °C 6: tetrabutylammonium fluoride / tetrahydrofuran / 1 h / Ambient temperature 7: Jones' reagent / acetone / 0.33 h / 0 °C View Scheme