1: 90 percent / NaN3; Bu4NI; 15-crown-5 / dioxane / 5 h / Heating 2: 84 percent / Ph3P / pyridine; aq. NH3 / 20 °C View Scheme

sodium azide; 15-crown-5; tetra-(n-butyl)ammonium iodide in 1,4-dioxane Mitsunobu-like reaction; 5 h; Heating;