manganese triacetate in acetic acid T=70°C; 3 h;

1: 2,3-dihydroindole With n-butyllithium in diethyl ether; hexane T=0 - 20°C; 1 h; Inert atmosphereSchlenk technique; 2: N,N-diethyl carbamoyl chloride in diethyl ether; hexane T=0 - 20°C; 14 h; Inert atmosphereSchlenk technique;

2,2,6,6-tetramethyl-1-piperidinyloxy, free radical; caesium carbonate in N,N-dimethyl-formamide T=80°C; 1 h; Inert atmosphere;

in pyridine; water

1: dichloromethane; acetonitrile / 24 h / 20 °C / Inert atmosphere 2: 2,2,6,6-tetramethyl-1-piperidinyloxy, free radical; caesium carbonate / N,N-dimethyl-formamide / 1 h / 80 °C / Inert atmosphere View Scheme