4-(N,N-dimethlyamino)pyridine; triethylamine in tetrahydrofuran; water T=20°C; 16 h; Inert atmosphere;

1: 2-bromo-benzenesulphonamide With potassium carbonate; caesium carbonate in N,N-dimethyl-formamide 0.5 h; 2: methyl iodide in N,N-dimethyl-formamide T=20°C; 1 h;