反应详情

To a suspension of 4-(methylsulfonyl)aniline (12 g, 70 mmol) in toluene (400 mL), trimethylaluminum (52.5 ml, 2M solution in toluene, 0.1 mol) was added over 15 minutes. The reaction mixture was warmed to room temperature and stirred for 3.5 hours. A solution of benzonitrile (14.5 g, 0.14 mol) in toluene (300 mL) was added over 10 minutes and the reaction mixture heated to 70–75° C. After 17 hours, the reaction mixture was cooled to room temperature and poured over a slurry of silica gel in chloroform. After filtration, the residue is washed with a mixture of methylene chloride/methanol (2/1). The combined filtrates are concentrated in vacuo and the resulting yellowish solid is stirred with a mixture of hexane/ether (2/1, 1000 mL). The intermediate is filtered and washed with more of hexane/ether (2/1). The yellowish solid N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide (16.7 g, 87%) was used in the next reaction without further purification.

1. additionwas added over 15 minutes
2. temperaturethe reaction mixture heated to 70–75° C
3. waitAfter 17 hours
4. temperaturethe reaction mixture was cooled to room temperature
5. filtrationAfter filtration
6. washthe residue is washed with a mixture of methylene chloride/methanol (2/1)
7. concentrationThe combined filtrates are concentrated in vacuo
8. stirringthe resulting yellowish solid is stirred with a mixture of hexane/ether (2/1, 1000 mL)
9. filtrationThe intermediate is filtered
10. washwashed with more of hexane/ether (2/1)
11. customThe yellowish solid N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide (16.7 g, 87%) was used in the next reaction without further purification