N-bromosuccinmide in toluene T=60°C; 2 h;

1: N-methoxyamine hydrochloride With potassium carbonate in water; ethyl acetate 2: 2-nitrobenzoic acid chloride in water; ethyl acetate T=0 - 20°C; 4 h;

1.1: thionyl chloride; N,N-dimethyl-formamide / 3 h / 60 °C 2.1: potassium carbonate / ethyl acetate; water 2.2: 4 h / 0 - 20 °C View Scheme