1: m-trifluoro-methyl-phenyl-magnesium bromide With titanium tetraethoxide in tetrahydrofuran T=20°C; 0.5 h; Inert atmosphere; 2: 3-bromo-5-pyridine-carboxylic acid With tributylphosphine; cobalt(II) chloride in tetrahydrofuran T=20°C; Inert atmosphere; chemoselective reaction;