Reaktion #80578

Reaktionsgleichung

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

sodium bicarbonate

2-bromoacetophenone

→

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

Ausbeute 57.0%

Lösungsmittel

isopropanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added
2. 2
   Sonstigethe solvent was removed
3. 3
   workup.DISSOLUTIONThe residue was redissolved in methylene chloride
4. 4
   Waschenwashed with aqueous sodium bicarbonate and water
5. 5
   Trocknendried over sodium sulfate
6. 6
   Filtrationfiltered
7. 7
   Einengenconcentrated in vacuo
8. 8
   SonstigeThe crude product (1.2 g) was chromatographed on silica gel with toluene/ethyl acetate (75/25)

Vorschrift

To a mixture of 4-chloro-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide (Example 1, Step 1) (400 mg, 1.29 mmol) and sodium bicarbonate (216 mg, 2.59 mmol) in isopropanol (25 mL), 2-bromoacetophenone (780 mg, 3.87 mmol) was added. After heating the reaction mixture at 55° C. for 20 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 (1.2 g) was chromatographed on silica gel with toluene/ethyl acetate (75/25) to give pure 2-(4-chlorophenyl)-1-[4-(methylsulfonyl)phenyl]-4-phenyl-1H-imidazole (300 mg, 57%) as a white solid: mp (DSC) 202° C. Anal. Calc'd. for C22H17N2SO2Cl: C, 63.78, H, 4.28, N, 6.76, S, 7.74. Found: C, 63.69, H, 4.11, N, 6.68, S, 7.65. ##STR28##

Quelle