8-Hydroxyquinoline → 3-(4-bromophenyl)-1-(4-(trifluoromethoxy)phenyl)-1 H-1,2,4-triazole

Participants

Reaction Conditions

Reaction Steps

To a solution of 1-iodo-4-(trifluoromethoxy)benzene (15.0 g, 52.0 mmol) in dimethylformamide (90 mL) and water (10 mL) was added 3-(4-bromophenyl)-1H-1,2,4-triazole (C51) (11.0 g, 49.0 mmol), cesium carbonate (34.0 g, 104 mmol), copper(I) iodide (2.80 g, 14.7 mmol), and 8-hydroxyquinoline (2.20 g, 15.0 mmol), and the solution was heated at 140° C. for 8 hours. The cooled solution was decanted from a layer of solid, diluted with a ammonium hydroxide (1 N, 100 mL) solution, and extracted with of diethyl ether (2×100 mL). The combined organic layer was dried and concentrated, and the brown solid was eluted through a short silica gel column using 20% ethyl acetate/hexanes as eluent to give the title compound as a light tan solid (9.50 g, 50%): mp 111-113° C.; 1H NMR (400 MHz, CDCl3) δ 8.56 (s, 1H), 8.07 (d, J=8.6 Hz, 2H), 7.79 (d, J=8.8 Hz, 2H), 7.62 (d, J=8.6 Hz, 2H), 7.39 (d, J=8.8 Hz, 2H); ESIMS m/z 384 ([M+H]+).

Provenance & Evidence