1: methanesulfonamide With thionyl chloride in benzene T=0°C; 24 h; Heating / reflux; 2: 4-bromo-2-methyl-phenylamine in benzene T=0°C; 3: With pyridine in benzene T=0°C; 80 h; Heating / reflux;

sulfuric acid; bromine; silver sulphate 0.5 h; Ambient temperature;