4-(N,N-dimethlyamino)pyridine; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride in dichloromethane T=70 - 80°C;

1: toluene-4-sulfonamide With N-bromosuccinmide; iron(II) chloride in acetonitrile T=20°C; 0.0166667 h; 2: S-ethyl 2-chloropyridine-3-carbothioate in acetonitrile T=45°C; 10 h;