1: ethyl indole-6-carboxylate With sodium hydride in N,N-dimethyl-formamide T=0°C; 1 h; 2: methyl iodide in N,N-dimethyl-formamide T=0 - 20°C; 2.5 h;

1: NaOH / ethanol; H2O / 8 h / Heating 2: triethylamine; diphenylphosphorazidate / benzene / 1 h / 20 °C 3: chlorobenzene / 1 h / Heating View Scheme

sodium hydroxide in ethanol; water 8 h; Heating;