反应详情

温度

63 °C

tert-Butyl 2-amino-5-fluorophenylcarbamate (30.5 g), toluene (300 mL), triethylamine (34.1 g) and ethyl 3,3,3-trifluoro-2-oxopropanoate (69.5 g) were charged into a reactor and warmed to 63° C. for 14 h, then cooled to ambient temperature. A 5% aq. NaOH solution (390 mL) was added, stirred, settled, and then the lower layer was separated. The organic layer extracted with another charge of 5% aq. NaOH solution (130 mL). To the combined aq. NaOH layers was charged 2-methyl-THF (390 mL) and concentrated HCl (77.9 g), keeping the temperature below 25° C. The layers were mixed, settled and separated. The acidic aq. layer was separated, and the organic layer was extracted with water (260 mL). The layers were separated and the organic layer was filtered to remove insoluble material. The product was isolated by switching the solvent to toluene by distillation (a total of 1.1 L toluene used). The final slurry was briefly warmed to 80° C. and then cooled −10° C. and filtered. The cake was washed with toluene (128 mL), then dried under vacuum at 60° C. To the crude solid was added ethanol (350 mL) and warmed to reflux to dissolve the solids. The solution was cooled to room temperature and concentrated to approximately 270 mL total volume by distillation. Water (250 g) was then added over 30 min. The slurry was filtered and washed with cold (1:1) ethanol: water (2×60 mL). The solid was dried under vacuum at 60° C. (26.1 g, 83% yield).

1. temperaturecooled to ambient temperature
2. customthe lower layer was separated
3. extractionThe organic layer extracted with
4. additionanother charge of 5% aq. NaOH solution (130 mL)
5. additionTo the combined aq. NaOH layers was charged 2-methyl-THF (390 mL) and concentrated HCl (77.9 g)
6. customthe temperature below 25° C
7. additionThe layers were mixed
8. customseparated
9. customThe acidic aq. layer was separated
10. extractionthe organic layer was extracted with water (260 mL)
11. customThe layers were separated
12. filtrationthe organic layer was filtered
13. customto remove insoluble material
14. customThe product was isolated
15. distillationby distillation (a total of 1.1 L toluene
16. temperatureThe final slurry was briefly warmed to 80° C.
17. temperaturecooled −10° C.
18. filtrationfiltered
19. washThe cake was washed with toluene (128 mL)
20. customdried under vacuum at 60° C
21. additionTo the crude solid was added ethanol (350 mL)
22. temperaturewarmed
23. temperatureto reflux
24. dissolutionto dissolve the solids
25. temperatureThe solution was cooled to room temperature
26. concentrationconcentrated to approximately 270 mL total volume by distillation
27. additionWater (250 g) was then added over 30 min
28. filtrationThe slurry was filtered
29. washwashed with cold (1:1) ethanol
30. customThe solid was dried under vacuum at 60° C. (26.1 g, 83% yield)