1: 78 percent / potassium tert-butoxide / tetrahydrofuran; dimethylsulfoxide / 0.75 h / 23 °C 2: 77 percent / LiAlH4 / tetrahydrofuran / 3 h 3: 84 percent / pyridine / 4 °C 4: 77 percent / HgO, BF3*Et2O / 0.5 h 5: 94 percent / 0.2 M NaOMe / methanol / 16 h / 4 °C 6: 83 percent / 0.01 M trifluoroacetic acid / 24 h / 4 °C View Scheme

1: 67 percent / potassium tert-butoxide / tetrahydrofuran; dimethylsulfoxide / 0.75 h / 23 °C 2: 87 percent / LiAlH4 / tetrahydrofuran / 3 h 3: 86 percent / pyridine / 4 °C 4: 65 percent / HgO, BF3*Et2O / 0.5 h 5: 95 percent / NaOMe / methanol / 16 h / 4 °C 6: 73 percent / 0.01 M trifluoroacetic acid / 24 h / 4 °C View Scheme