反应详情

温度

10 °C

1-(3-Fluoro-4-methanesulfonyl-phenyl)-propan-2-one (Example 64c) (1.0 g, 4.34 mmol) is dissolved in dioxane (35 ml) and the solution is cooled to 10° C. at which point the mixture is semi frozen. Bromine (0.067 ml, 1.2 mmol, 0.3 eq.) is added slowly and the mixture is stirred for an additional 15 min in a semi frozen state. The mixture is then allowed to warm to room temperature and the solvent is removed to give a brown oil containing starting material and 1-bromo-1-(3-fluoro-4-methanesulfonyl-phenyl)-propan-2-one. This material is dissolved in ethanol (30 ml) and N-acetylthiourea (0.369 g, 3.1 mmol) is added in one portion. The mixture is stirred at 60° C. for 30 minutes then allowed to cool whereupon the product crystallised. Filtration affords the title compound as a white solid.

1. temperatureis semi frozen
2. temperaturefrozen state
3. temperatureto warm to room temperature
4. customthe solvent is removed
5. customto give a brown oil
6. additioncontaining
7. stirringThe mixture is stirred at 60° C. for 30 minutes
8. temperatureto cool whereupon the product
9. customcrystallised
10. filtrationFiltration