تفاعل #80582

معادلة التفاعل

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

sodium bicarbonate

4-chlorophenacyl bromide

→

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

المردود 55.0%

المذيبات

isopropanol

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONwas added
2. 2
   درجة الحرارةAfter heating the reaction mixture at 80°-85° C. for 18 hours
3. 3
   أخرىthe solvent was removed
4. 4
   workup.DISSOLUTIONThe residue was redissolved in methylene chloride
5. 5
   غسيلwashed with aqueous sodium bicarbonate and water
6. 6
   تجفيفdried over sodium sulfate
7. 7
   ترشيحfiltered
8. 8
   تركيزconcentrated in vacuo
9. 9
   أخرىThe crude product was chromatographed (silica gel, hexane/ethyl acetate, 6/4)

الإجراء التجريبي

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 (30 mL), 4-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-bis-(4-chlorophenyl)-1-[4-(methylsulfonyl)phenyl]-1H-imidazole (545 mg, 55%) as a pale yellow solid: mp 169°-171° C. Anal. Calc'd. for C22H16N2SO2Cl12 : C, 59.60, H, 3.64, N, 6.32, S, 7.23. Found: C, 59.86, H, 3.80, N, 6.10, S, 7.27.

المصدر