1: 2-hydroxy-5-bromo-benzoic aldehyde With sodium hydride in N,N-dimethyl-formamide T=10 - 35°C; 0.5 h; 2: trifluoromethylsulfonyloxy-2,2,2-trifluoroethane in N,N-dimethyl-formamide T=65°C; 2 h;