反应详情

Under argon atmosphere, to a solution of 2-fluoro-4-iodoaniline 47 (20.0 g) and triethylamine (23.6 ml) in chloroform (200 ml) was added N,N-carbonyldiimidazole (27.4 g) with stirring under ice-cooling. After the completion of the addition, the mixture was stirred under ice-cooling for 15 min and at room temperature for 4 hrs. The reaction mixture was ice-cooled, and 28% aqueous ammonia (100 ml) was added dropwise. The mixture was stirred at room temperature for 1.5 hrs. The precipitated crystals were collected by filtration, washed with water and dried to give (2-fluoro-4-iodophenyl)-urea 78 (23.5 g, yield 98.8%) as pale-pink crystals.

1. temperaturecooling
2. additionAfter the completion of the addition
3. stirringthe mixture was stirred under ice-
4. temperaturecooled
5. stirringThe mixture was stirred at room temperature for 1.5 hrs
6. filtrationThe precipitated crystals were collected by filtration
7. washwashed with water
8. customdried