1: 80 percent / pyridine / 20 h / 60 °C 2: 80 percent / n-Bu4NF 3: 82 percent / p-toluenesulfonic acid / dioxane / 2 h / 23 °C 4: 78 percent / NaOH / acetonitrile; methanol; H2O 5: pyridine, (N,N-dimethylamino)pyrydine / CH2Cl2 / 1 h / 5 °C 6: tertbutylammonium fluoride / tetrahydrofuran / 5 h / 5 °C 7: 41 percent / Dowex 50W x 2-100 / methanol / 1 h / 23 °C 8: 80 percent / sat. NH3 in MeOH / 16 h / 20 °C View Scheme