1: 95 percent / NaN3 / dimethylformamide / 48 h / 80 °C 2: 74 percent / K2CO3 / methanol; H2O / 12 h / Ambient temperature 3: 87 percent / toluene / 30 h / Heating 4: 1.) BH3, 2.) 30percent aq H2O2, aq NaOH / THF, 1.) room temp., overnight, 2.) ethanol, reflux 2 h 5: 85 percent / 6 N HCl / tetrahydrofuran / Ambient temperature; overnight View Scheme