1.1: acetic anhydride / |Inert atmosphere 1.2: |Inert atmosphere 2.1: pyridine / dichloromethane / 15 h / 0 °C / |Inert atmosphere 3.1: calcium carbonate; water / tetrahydrofuran / 24 h / 60 °C / |Inert atmosphere View Scheme

2,2,6,6-tetramethyl-1-piperidinyloxy, free radical; CuCl2·2H2O in acetonitrile T=20°C; 8 h; Molecular sieve; chemoselective reaction;