1: NaN3 / ethanol / 40 h / Ambient temperature 2: 57 percent / methanol / 6 h / Ambient temperature 3: 71 percent / K2CO3 / acetonitrile; H2O / 5 h / Ambient temperature 4: 65 percent / diisopropylcarbodiimide, 4-(N,N-dimethylamino)pyridine / dimethylformamide; CH2Cl2 / 17 h / Ambient temperature 5: n-Bu3P, H2O / dimethylformamide / 5 h View Scheme