1: pyridine / 0 - 20 °C 2: 89 percent / sodium azide / dimethylformamide / 24 h / 20 °C 3: 85 percent / hydrogen / Pd/charcoal / ethyl acetate / 1 h / Heating 4: 0.70 g / NaHCO3 / ethyl acetate; H2O / 3 h 5: 94 percent / HCl / methanol; H2O / Heating 6: sodium periodate / methanol / 3 h 7: 12 mg / hydrogen; glacial acetic acid / Pd-C / ethanol View Scheme