Treatment of 1-(2-isothiocyanoaryl)-2-(2-furyl)ethane with anhydrous aluminum chloride under Friedel-Crafts conditions yielded a pyrrolo[1,2-a]quinoline derivative via electrophilic attack of the activated isothiocyano group onto the furan ring. The analogous diarylethane under these conditions underwent intramolecular cyclization leading to an eight-membered thioamide.