1: 68.3 percent / NaN3 / dimethylformamide / 6 h / 80 °C 2: 62.8 percent / bis(trimethylsilylacetamide); TMS triflate / acetonitrile / 171 h / 20 °C 3: 97 mg / NH3 / methanol / 18 h / 20 °C View Scheme