1: 3-((2,4-dinitro)benzamido)benzoic acid With caesium carbonate in ethanol; water pH=6.5; 2: α-bromo-4-methylacetophenone in N,N-dimethyl-formamide 3 h;

1.1: thionyl chloride / 16 h / 0 °C 2.1: triethylamine; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; benzotriazol-1-ol / dichloromethane / 3 h 3.1: water; lithium hydroxide hydrate / tetrahydrofuran / 16 h 4.1: caesium carbonate / ethanol; water / pH 6.5 4.2: 3 h View Scheme

1.1: triethylamine; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; benzotriazol-1-ol / dichloromethane / 3 h 2.1: water; lithium hydroxide hydrate / tetrahydrofuran / 16 h 3.1: caesium carbonate / ethanol; water / pH 6.5 3.2: 3 h View Scheme

1.1: water; lithium hydroxide hydrate / tetrahydrofuran / 16 h 2.1: caesium carbonate / ethanol; water / pH 6.5 2.2: 3 h View Scheme