In an oven dried Schlenk tube 0.53 g of dibromide 1 (1.19 mmol) and 0.26 g of aniline-2-sulfonic acid were dissolved in 10 mL of DMF. The solution was degassed three times. Then 0.90 mL of Et 3 N (0.65 g, 6.45 mmol, 5.4 equiv.) was added with a syringe and the mixture was heated to 130 • C. After 24 hours the resulting mixture was cooled to room temperature and water (50 mL) was added.