1: 5-fluoro-1H-indole With n-butyllithium in tetrahydrofuran; hexane T=-78 - 0°C; 1 h; 2: benzenesulfonyl chloride in tetrahydrofuran; hexane T=0 - 20°C; 2.5 h;

1: 1.) AlCl3 / 1.) CH2Cl2, 25 deg C, 15 min, 2.) CH2Cl2, 25 deg C, 2 h 2: 85 percent / K2CO3 / methanol; H2O / 2 h / Heating View Scheme