1.1: NaH / dimethylformamide / Heating 2.1: O-mesitylenesulfonylhydroxylamine / CH2Cl2 / 0.5 h / 20 °C 2.2: 78 percent / potassium carbonate / CH2Cl2 / 12 h / 20 °C View Scheme

sodium hydride in N,N-dimethyl-formamide Heating;