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

1: CH2Cl2 / 25 °C 2: 1.) NaH / 1.) THF, 2.) THF, 25 deg C View Scheme

sodium hydride 1.) THF, 2.) THF, 25 deg C; Multistep reaction;

chlorosulfonic acid T=0°C;