AlCl3, aluminium chloride; bromine; iron in dichloromethane T=0 - 20°C; 2 h;

1: 1-bromo-3,5-difluoro-benzene With (2,2,6,6-tetramethylpiperidinyl)MgCl*LiCl in tetrahydrofuran T=-20°C; 1 h; Inert atmosphereSchlenk technique; 2: methanethiosulfonic acid S-methyl ester in tetrahydrofuran T=25°C; Negishi Coupling; 1 h; Inert atmosphereSchlenk technique;

oxonereg; in methanol 12 h;