To a stirred solution of 1-(4-(1-(trimethylsilyloxy)vinyl)phenyl)-1H-1,2,4-triazole (6 g, 23 mmol) and 1-(1-bromo-2,2,2-trifluoro-ethyl)-3,5-dichlorobenzene (7.1 g, 34.7 mmol) in 1,2-dichlorobenzene (30 mL) was degassed with argon. To this CuCl (0.23 g, 2.31 mmol) and 2,2-bipyridyl (0.73 g, 4.63 mmol) was added to the above reaction mixture and the resultant reaction mixture was heated to 180° C. for 18 h. After completion of the reaction (by TLC), the reaction mixture was absorbed onto silica gel and purified by column chromatography (SiO2; 10% EtOAc in petroleum ether) to afford title compound as a solid (3 g, 31%): 1H NMR (400 MHz, CDCl3) δ 8.67 (s, 1H), 8.15 (s, 1H), 8.10 (d, J=8.3 Hz, 2H), 7.82 (d, J=8.3 Hz, 2H), 7.33 (m, 1H), 7.30 (m, 2H), 4.20 (m, 1H), 3.63 (m, 2H); ESIMS m/z 412.14 ([M−H]−).
