pyridine; 4-(N,N-dimethlyamino)pyridine in dichloromethane T=45°C;

1: propane-2-sulfonic acid (2,4-difluoro-phenyl)-amide With n-butyllithium in tetrahydrofuran; hexane 1.66667 h; Cooling with acetone-dry ice; 2: N,N-dimethyl-formamide in tetrahydrofuran; hexane T=20°C;