反应详情

温度

50 °C

To the solution of 2-fluoro-4-(trifluoromethyl)benzoic acid (1 kg, 4.805 mol, 1.00 equivalent “eq.”) and CuCl (14.26 g, 0.144 mol, 0.03 eq.) in t-BuOH (11.7 L) was added triethylamine (TEA, 533.8 g, 5.286 mol, 1.10 eq.) dropwise at room temperature (rt). Then the solution was heated to 50° C. and diphenylphosphoryl azide (DPPA, 1393 g, 5.045 mol, 1.05 eq.) was added dropwise to the solution at 50-60° C. After heating at 80˜85° C. overnight the solution was concentrated under vacuum. The residual was dissolved in H2O and filtered. The filtrate was extracted with ethyl acetate. The organic layers was dried with Na2SO4, filtered and concentrated under vacuum. The residual was dissolved in tert-Butyl methyl ether (TBME) and HCl (gas) was bubbled in for 2 hours. The filtrate was collected and dissolved in water and basified with 2 M NaOH. The solution was extracted with TBME. The organic layers were dried and concentrated under vacuum to give 2-fluoro-4-(trifluoromethyl) aniline (498 g, 58%) as a red oil.

1. temperatureAfter heating at 80˜85° C. overnight the solution
2. concentrationwas concentrated under vacuum
3. dissolutionThe residual was dissolved in H2O
4. filtrationfiltered
5. extractionThe filtrate was extracted with ethyl acetate
6. dry with materialThe organic layers was dried with Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under vacuum
9. dissolutionThe residual was dissolved in tert-Butyl methyl ether (TBME)
10. customHCl (gas) was bubbled in for 2 hours
11. customThe filtrate was collected
12. dissolutiondissolved in water and basified with 2 M NaOH
13. extractionThe solution was extracted with TBME
14. customThe organic layers were dried
15. concentrationconcentrated under vacuum