12.8 g (88.8 mmol) 4-cyanophenylisocyanat were dissolved in 500 ml diethyl ether at rt. 9.6 g (88.8 mmol) o-phenylene diamine were added with stirring. After stirring overnight, the reaction mixture was filtrated and the solid washed with diethylether. The so prepared mono-urea derivative was sufficient pure for further reactions. 3.78 (15 mmol) were dissolved in 30 ml anhydrous dry DMF, 3.44 g (15 mmol) 4-(1-bromoethyl)-benzoic acid and 2 g potassium carbonate were added and stirred for 3 days at rt. The solvent was removed under reduced pressure, the product dissolved in ethyl acetate and extracted with 1 m HCl, water and brine. The organic phase was dried over sodium sulfate and the solvent removed under reduced pressure.
