sodium hydroxide; palladium on activated charcoal; dihydrogen peroxide 1.) 45 deg C, 20 h, 2.) 25 deg C, 1 h;

1: 65 percent / pyridine / 15 h / Heating 2: 82 percent / 1.) 0.1N NaOH, 30percent H2O2, 2.) 10percent Pd/C / 1.) 45 deg C, 20 h, 2.) 25 deg C, 1 h View Scheme

1: 78 percent / K2CO3, O-(2,4-dinitrophenyl)hydroxylamine / dimethylformamide / 3 h / Ambient temperature 2: 1.) acetic anhydride / 1.) 0-50 deg C, 30 min, 2.) 25 deg C, 3.5 d 3: 90 percent / K2CO3 / dimethylformamide / 1.5 h / Ambient temperature 4: 91 percent / NaOH / H2O / 2 h / Heating 5: 65 percent / pyridine / 15 h / Heating 6: 82 percent / 1.) 0.1N NaOH, 30percent H2O2, 2.) 10percent Pd/C / 1.) 45 deg C, 20 h, 2.) 25 deg C, 1 h View Scheme

1: 65 percent / pyridine / 15 h / Heating 2: 82 percent / 1.) 0.1N NaOH, 30percent H2O2, 2.) 10percent Pd/C / 1.) 45 deg C, 20 h, 2.) 25 deg C, 1 h View Scheme

1: 91 percent / NaOH / H2O / 2 h / Heating 2: 65 percent / pyridine / 15 h / Heating 3: 82 percent / 1.) 0.1N NaOH, 30percent H2O2, 2.) 10percent Pd/C / 1.) 45 deg C, 20 h, 2.) 25 deg C, 1 h View Scheme

1: 1.) acetic anhydride / 1.) 0-50 deg C, 30 min, 2.) 25 deg C, 3.5 d 2: 90 percent / K2CO3 / dimethylformamide / 1.5 h / Ambient temperature 3: 91 percent / NaOH / H2O / 2 h / Heating 4: 65 percent / pyridine / 15 h / Heating 5: 82 percent / 1.) 0.1N NaOH, 30percent H2O2, 2.) 10percent Pd/C / 1.) 45 deg C, 20 h, 2.) 25 deg C, 1 h View Scheme

1: 90 percent / K2CO3 / dimethylformamide / 1.5 h / Ambient temperature 2: 91 percent / NaOH / H2O / 2 h / Heating 3: 65 percent / pyridine / 15 h / Heating 4: 82 percent / 1.) 0.1N NaOH, 30percent H2O2, 2.) 10percent Pd/C / 1.) 45 deg C, 20 h, 2.) 25 deg C, 1 h View Scheme