1: 20percent aqueous NaOH / ethanol / 12 h / Heating 2: 86 percent / diethyl ether; methanol; CHCl3 / 0.17 h / 0 °C 3: 86 percent / AcOH, polyphosphoric acid / acetonitrile / 12 h / Ambient temperature 4: 77 percent / NH2OH*HCl, NaOAc / ethanol / 1 h / Heating 5: 51 percent / xylene / 24 h / Heating 6: 95 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 7: 98 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: 86 percent / diethyl ether; methanol; CHCl3 / 0.17 h / 0 °C 4: 86 percent / AcOH, polyphosphoric acid / acetonitrile / 12 h / Ambient temperature 5: 77 percent / NH2OH*HCl, NaOAc / ethanol / 1 h / Heating 6: 51 percent / xylene / 24 h / Heating 7: 95 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 8: 98 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 9: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

1: 20percent aqueous NaOH / ethanol / 14 h / Heating 2: pyridine / 12 h / Heating 3: 86 percent / diethyl ether; methanol; CHCl3 / 0.17 h / 0 °C 4: 86 percent / AcOH, polyphosphoric acid / acetonitrile / 12 h / Ambient temperature 5: 77 percent / NH2OH*HCl, NaOAc / ethanol / 1 h / Heating 6: 51 percent / xylene / 24 h / Heating 7: 95 percent / 10percent aqueous NaOH / ethanol / 1 h / Heating 8: 98 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 9: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

1: 98 percent / diphenylphosphoryl azide (DPPA), triethylamine / 0.5 h / 80 °C 2: 81 percent / AcOH / H2O / 1 h / 80 °C View Scheme

aluminium trichloride T=100 - 120°C; 12 h;

1: 40 percent / (CF3CO)2O; CF3COOH; H2O2 / Mo(CO)6 / CH2Cl2 / cooling 2: 96 percent / hydrazine monohydrate / Pd/C / tetrahydrofuran / 1 h / -20 °C 3: 37 percent / triethylamine / tetrahydrofuran / 0.5 h / -20 - 0 °C 4: 91 percent / triethylamine / tetrahydrofuran / 1 h / 0 °C 5: acetonitrile; H2O / 20 °C / pH 7.0 View Scheme

triethylamine in tetrahydrofuran T=-20 - 0°C; 0.5 h;

1: 40 percent / (CF3CO)2O; CF3COOH; H2O2 / Mo(CO)6 / CH2Cl2 / cooling 2: 96 percent / hydrazine monohydrate / Pd/C / tetrahydrofuran / 1 h / -20 °C View Scheme

dihydrogen peroxide; trifluoroacetic acid; trifluoroacetic anhydride; hexacarbonyl molybdenum in dichloromethane cooling;