反应详情

To a suspension of 4-(methylsulfonyl)aniline, (2.82 g, 16.5 mmol) in toluene (150 mL), trimethylaluminum (2M solution in toluene, 12.5 mL, 24.7 mmol) was added over 15 minutes. The reaction mixture was warmed to room temperature and stirred for 2.5 hours. A solution of 3-fluoro-4-methoxybenzonitrile (5 g, 33 mmol) in toluene (100 mL) was added over 10 minutes and the reaction mixture was heated to 80–85° C. After 20 hours, the reaction mixture was cooled to room temperature and poured over a slurry of silica gel in chloroform. After filtration, the residue was washed with a mixture of methylene chloride/methanol (2/1). The combined filtrates were concentrated in vacuo and the resulting yellowish solid was stirred with a mixture of hexane/ether (2/1, 1000 mL). The intermediate was filtered and washed with more hexane/ether (2/1). The pale yellow solid 3-fluoro-4-methoxy-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide (3.95 g, 74%) was used in the next reaction without further purification: mp (DSC) 195° C. Anal. Calc'd. for C15H15N2SO3F: C, 55.89; H, 4.69; N, 8.69. Found: C, 55.92; H, 4.74; N, 8.53.

1. additionwas added over 15 minutes
2. temperaturethe reaction mixture was heated to 80–85° C
3. waitAfter 20 hours
4. temperaturethe reaction mixture was cooled to room temperature
5. filtrationAfter filtration
6. washthe residue was washed with a mixture of methylene chloride/methanol (2/1)
7. concentrationThe combined filtrates were concentrated in vacuo
8. stirringthe resulting yellowish solid was stirred with a mixture of hexane/ether (2/1, 1000 mL)
9. filtrationThe intermediate was filtered
10. washwashed with more hexane/ether (2/1)
11. customThe pale yellow solid 3-fluoro-4-methoxy-N-[4-(methylsulfonyl)phenyl]benzenecarboximidamide (3.95 g, 74%) was used in the next reaction without further purification