1: 3,5-difluoro-aniline With n-butyllithium; chloro-trimethyl-silane in tetrahydrofuran; hexane T=-78 - 23°C; 2: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 5 h; 3: N,N-dimethyl-formamide in tetrahydrofuran; hexane T=-78 - 23°C;

pyridine in dichloro difluoro methane T=20°C; 18 h;