Reaktion #90311

Reaktionsgleichung

3-Bromo-1-(4-isopropoxyphenyl)-1H-1,2,4-triazole

cesium carbonate

1-iodo-4-(trifluoromethyl)benzene

→

title compound

Ausbeute 64.0%

3-bromo-1-(4-(trifluoromethyl)phenyl)-1H-1,2,4-triazole

Ausbeute 64.0%

Lösungsmittel

dimethylsulfoxide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigethe solution was degassed with nitrogen for 10 minutes
2. 2
   TemperaturAfter cooling to room temperature
3. 3
   workup.ADDITIONthe reaction mixture was diluted with ethyl acetate
4. 4
   Filtrationfiltered through Celite®
5. 5
   FiltrationThe resulting filter cake
6. 6
   Waschenwas rinsed with additional ethyl acetate (100 mL)
7. 7
   workup.ADDITIONSaturated aqueous ammonium chloride was added to the filtrate which
8. 8
   SonstigeThe layers were separated
9. 9
   Extraktionthe aqueous layer was extracted with ethyl acetate (2×50 mL)
10. 10
    TrocknenThe combined organic extracts were dried over anhydrous magnesium sulfate
11. 11
    Einengenconcentrated onto Celite®
12. 12
    SonstigePurification by silica gel chromatography

Vorschrift

3-Bromo-1-(4-isopropoxyphenyl)-1H-1,2,4-triazole (7.15 g, 48.3 mmol), copper(I) iodide (1.25 g, 6.56 mmol), cesium carbonate (18.9 g, 58.0 mmol), and 1-iodo-4-(trifluoromethyl)benzene (8.29 g, 30.5 mmol) were added to dimethylsulfoxide (50 mL) and the solution was degassed with nitrogen for 10 minutes. The solution was heated at 100° C. for 20 hours. After cooling to room temperature, the reaction mixture was diluted with ethyl acetate and filtered through Celite®. The resulting filter cake was rinsed with additional ethyl acetate (100 mL). Saturated aqueous ammonium chloride was added to the filtrate which was then stirred for 30 minutes. The layers were separated and the aqueous layer was extracted with ethyl acetate (2×50 mL). The combined organic extracts were dried over anhydrous magnesium sulfate and concentrated onto Celite®. Purification by silica gel chromatography using 0-100% ethyl acetate/hexanes as eluent provided the title compound as a white solid (5.64 g, 64%): mp 87-89° C.; 1H NMR (400 MHz, CDCl3) δ 8.53 (s, 1H), 7.85-7.77 (m, 4H); ESIMS m/z 292.0 ([M+H]+).

Quelle