Benzyl Bromide → 1-(7-Benzyloxy-8-nitro-1,2,4,5-tetrahydro-benzo[d]azepin-3-yl)-2,2,2-trifluoro-ethanone

1.30 g (4.27 mmol) 2,2,2-trifluoro-1-(7-hydroxy-8-nitro-1,2,4,5-tetrahydro-benzo[d]azepin-3-yl)-ethanone are placed in 20 ml DMF and at room temperature 0.65 g (4.70 mmol) potassium carbonate and 0.508 ml (4.27 mmol) benzylbromide are added and the mixture is stirred for 3 h. Then it is filtered and the filtrate is concentrated by evaporation i.vac., the residue is triturated with water, suction filtered and dried at 45° C. in the circulating air dryer.