1: With phosphorus pentachloride in dichloromethane T=0°C; intramolecular Friedel-Crafts cyclisation; 1 h; Inert atmosphere; 2: With tin(IV) chloride in dichloromethane T=0°C; intramolecular Friedel-Crafts cyclisation; 5 h; Inert atmosphere; regioselective reaction;