1: 1.) triethylamine 2.) sodium azide / 1.) acetone, water, -5 deg C, 30 min, 2.) acetone, water, -5 deg C, 10 min 2: toluene / 0.17 h / Heating 3: 8N aq. HCl / 0.5 h / Heating 4: 30 percent / BBr3 / CH2Cl2 / 4 h / Ambient temperature View Scheme