1: N-pentylindole With dimethylaluminum chloride in hexane; dichloromethane T=0°C; Friedel-Crafts reaction; 1 h; Inert atmosphere; 2: C11H6Cl2O in hexane; dichloromethane T=0 - 20°C; Friedel-Crafts reaction; 6 h; Inert atmosphere;