1: sulfuric acid; acetic acid / 12 h / 0 - 20 °C / Inert atmosphere 2: trimethylsilylazide / tert-butyl alcohol / 10 h / Reflux; Inert atmosphere 3: hydrogen / ethanol / 15 h / 20 °C / 760.05 Torr / Inert atmosphere 4: tetrahydrofuran / 29 h / 50 °C / Inert atmosphere 5: methanol; sodium methylate / 1 h / 20 °C / Inert atmosphere 6: trifluoroacetic acid / dichloromethane / 2.5 h / 20 °C / Inert atmosphere View Scheme

1: sulfuric acid; acetic acid / 12 h / 0 - 20 °C / Inert atmosphere 2: trimethylsilylazide / tert-butyl alcohol / 10 h / Reflux; Inert atmosphere View Scheme

1: sulfuric acid; acetic acid / 12 h / 0 - 20 °C / Inert atmosphere 2: trimethylsilylazide / tert-butyl alcohol / 10 h / Reflux; Inert atmosphere 3: hydrogen / ethanol / 15 h / 20 °C / 760.05 Torr / Inert atmosphere View Scheme

sulfuric acid; acetic acid T=0 - 20°C; 12 h; Inert atmosphere;