1: indole With diethylaluminium chloride in hexane; dichloromethane T=-78 - -10°C; 0.25 h; 2: 3-pyridinecarbonyl chloride hydrochloride in hexane; dichloromethane T=-10 - 20°C; Friedel-Crafts reaction; 2 h;

diethyl ether

T=5 - 10°C;