1: 97 percent / SO3*pyridine, NEt3 / dimethylsulfoxide / 1.5 h / Ambient temperature 2: 89 percent / xylene / 90 h / Heating 3: H2 / 10percent Pd/C / ethanol / 6 h / 2250.2 Torr / Ambient temperature 4: 43.8 mg / 10percent aq.KOH / methanol / 4 h / Ambient temperature 5: 86 percent / CF3CO2H / 1.17 h / Ambient temperature View Scheme