1: 95 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 2: 98 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 3: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

sodium hydroxide in ethanol 1 h; Heating;