n-butyllithium; sulfuric acid in tetrahydrofuran; hexane

potassium carbonate in N,N-dimethyl-formamide T=60°C; 2 h;

1: 2-mercaptoacetic acid methyl ester; 2-fluoro-3-(trifluoromethyl)benzaldehyde With potassium carbonate in N,N-dimethyl-formamide T=140°C; 2 h; 2: With hydrogenchloride in water 3: methanol With oxalyl dichloride T=80°C; 2 h;

pyridine; 4-(N,N-dimethlyamino)pyridine; hydrazine T=100°C; 24 h;

sulfuric acid; nitric acid T=20°C; 0.5 h;