1: NH2OH*HCl / H2O; methanol / 1 h / Heating 2: 1) MnO2, 2) Triethylamine / 1) CH2Cl2, 15 min, room temperature, 2) reflux, 15 min View Scheme

1: NaH (80percent suspension) / 2.5 h / Ambient temperature 2: NH2OH*HCl / H2O; methanol / 1 h / Heating 3: 1) MnO2, 2) Triethylamine / 1) CH2Cl2, 15 min, room temperature, 2) reflux, 15 min View Scheme

manganese(IV) oxide; triethylamine 1) CH2Cl2, 15 min, room temperature, 2) reflux, 15 min; Multistep reaction;

triethylamine 1) THF, reflux, 15 min, 2) reflux, 15 min; Multistep reaction;