1: 3-(4,4,4-trifluoro-3-(nitromethyl)butanoyl)oxazolidin-2-one With hydrogen in ethanol; ethyl acetate T=20°C; P=760.051 Torr; 24 h; 2: di-tert-butyl dicarbonate With 4-(N,N-dimethlyamino)pyridine; triethylamine in dichloromethane T=20°C;

4-(N,N-dimethlyamino)pyridine in acetonitrile

4-(N,N-dimethlyamino)pyridine; triethylamine in tetrahydrofuran 3 h; Ambient temperature;

oxygen; N(Et)4ClO4 1.) -1.0 V vs SCE, MeCN, 2.) room temperature, overnight; Yield given. Multistep reaction;

potassium carbonate in methanol; water 1.5 h; Ambient temperature;