反应详情

To a solution of 5-(5-methyl-1H-1,2,4-triazol-3-yl)-3-(4-(trifluoromethoxy)phenyl)-1,2,4-oxadiazole (311 mg, 1.0 mmol) in DMSO (5 mL), Cs2CO3 (652 mg, 2.0 mmol) and methyl 3-(bromomethyl)benzoate (252 mg, 1.1 mmol) were added at RT. The mixture was stirred at RT for 2 h. The resulting mixture was diluted with H2O (20 mL) and extracted with EtOAc (4×40 mL). The combined organic layers werewashed with H2O (20 mL) and brine (2×20 mL), dried over Na2SO4, filtered and concentrated under reduced pressure, and the residue was purified by a silica gelchromatography (EtOAc/Hexane 10% to 60% EtOAc) to give methyl 3-((5-methyl-3-(3-(4-(trifluoromethoxy)phenyl)-1,2,4-oxadiazol-5-yl)-1H-1,2,4-triazol-1-yl)methyl)benzoate as a white solid (310 mg, 68%). MS (ES+) C21H16F3N5O4 requires: 459. found: 460 [M+H]+; 1H NMR (600 MHz, CDCl3) δ 8.29 (d, J=8.8 Hz, 2H), 8.04 (d, J=7.4 Hz, 1H), 7.95 (s, 1H), 7.48 (t, J=7.5 Hz, 1H), 7.45 (d, J=7.8 Hz, 1H), 7.34 (d, J=8.3 Hz, 2H), 5.51 (s, 2H), 3.92 (s, 3H), 2.55 (s, 3H).

1. extractionextracted with EtOAc (4×40 mL)
2. dry with materialdried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customthe residue was purified by a silica gelchromatography (EtOAc/Hexane 10% to 60% EtOAc)