1: With CuSO4‵5H2O; trifluoromethanesulfonyl azide; potassium carbonate in methanol; water T=20°C; pH=9.5; 2: With hydrogenchloride in water pH=2;

methyl(trimethylsilyl)trifluoroacetamide 1.) CH2Cl2, reflux, 2.) CH2Cl2, room temperature, 4 h; Yield given. Multistep reaction;