potassium carbonate; O-(2,4-dinitro-phenyl)-hydroxylamine in N,N-dimethyl-formamide 3 h; Ambient temperature;

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 View Scheme

acetic anhydride in formic acid

acetic anhydride 1.) 0-50 deg C, 30 min, 2.) 25 deg C, 3.5 d; Yield given. Multistep reaction;

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 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 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: 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: 75 percent / pyridine / 15 h / Heating View Scheme