acetic acid in water T=80°C; 1 h;

1: 90 percent / LDA / tetrahydrofuran / -78 deg C, 5 min, RT 2: 84 percent / potassium carbonate / methanol / 0.92 h / Ambient temperature 3: 23 percent / aluminum chloride / 12 h / 100 - 120 °C View Scheme

1: Irradiation 2: 90 percent / LDA / tetrahydrofuran / -78 deg C, 5 min, RT 3: 84 percent / potassium carbonate / methanol / 0.92 h / Ambient temperature 4: 23 percent / aluminum chloride / 12 h / 100 - 120 °C View Scheme

1: 84 percent / potassium carbonate / methanol / 0.92 h / Ambient temperature 2: 23 percent / aluminum chloride / 12 h / 100 - 120 °C View Scheme

1: 82 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 2: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

1: 90 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 2: 82 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 3: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

1: 20percent aqueous NaOH / ethanol / 12 h / Heating 2: 77 percent / diethyl ether; methanol; CHCl3 / 0.17 h / 0 °C 3: 94 percent / AcOH, polyphosphoric acid / acetonitrile / 12 h / Ambient temperature 4: 87 percent / NH2OH*HCl, NaOAc / ethanol / 1 h / Heating 5: 55 percent / xylene / 24 h / Heating 6: 90 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 7: 82 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 8: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

1: 1.5 h / 180 °C 2: 20percent aqueous NaOH / ethanol / 12 h / Heating 3: 77 percent / diethyl ether; methanol; CHCl3 / 0.17 h / 0 °C 4: 94 percent / AcOH, polyphosphoric acid / acetonitrile / 12 h / Ambient temperature 5: 87 percent / NH2OH*HCl, NaOAc / ethanol / 1 h / Heating 6: 55 percent / xylene / 24 h / Heating 7: 90 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 8: 82 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 9: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

1: 77 percent / diethyl ether; methanol; CHCl3 / 0.17 h / 0 °C 2: 94 percent / AcOH, polyphosphoric acid / acetonitrile / 12 h / Ambient temperature 3: 87 percent / NH2OH*HCl, NaOAc / ethanol / 1 h / Heating 4: 55 percent / xylene / 24 h / Heating 5: 90 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 6: 82 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 7: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

1: 94 percent / AcOH, polyphosphoric acid / acetonitrile / 12 h / Ambient temperature 2: 87 percent / NH2OH*HCl, NaOAc / ethanol / 1 h / Heating 3: 55 percent / xylene / 24 h / Heating 4: 90 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 5: 82 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 6: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme