Reaktion #80583

Reaktionsgleichung

4-chloro-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide

sodium bicarbonate

3-chlorophenacyl bromide

→

2-(4-chlorophenyl)-4-(3-chlorophenyl)-1-[4-(methylsulfonyl)phenyl]-1H-imidazole

Ausbeute 53.0%

Lösungsmittel

isopropanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   TemperaturAfter heating the reaction mixture at 80°-85° C. for 18 hours
3. 3
   Sonstigethe solvent was removed
4. 4
   workup.DISSOLUTIONThe residue was redissolved in methylene chloride
5. 5
   Waschenwashed with aqueous sodium bicarbonate and water
6. 6
   Trocknendried over sodium sulfate
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated in vacuo
9. 9
   SonstigeThe crude product was chromatographed (silica gel, hexane/ethyl acetate, 6/4)

Vorschrift

To a mixture of 4-chloro-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide (Example 1, Step 1) (700 mg, 2.24 mmol) and sodium bicarbonate (376 mg, 4.48 mmol) in isopropanol (35 mL), 3-chlorophenacyl bromide (1.05 g, 4.48 mmol) was added. After heating the reaction mixture at 80°-85° C. for 18 hours, the solvent was removed. The residue was redissolved in methylene chloride and washed with aqueous sodium bicarbonate and water. The organic fractions were combined, dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was chromatographed (silica gel, hexane/ethyl acetate, 6/4) to give 2-(4-chlorophenyl)-4-(3-chlorophenyl)-1-[4-(methylsulfonyl)phenyl]-1H-imidazole (525 mg, 53%) as a pale yellow solid: mp 156°-159° C. Anal Calc'd. for C22H16N2SO2Cl2 : C, 59.60, H, 3.69, N, 6.32, S, 7.23. Found: C, 59.43, H, 3.59, N, 6.15, S, 7.16.

Quelle