(4-Nitrophenyl)acetic acid → 1-(4-Nitrophenyl)propan-2-one

Temperatur

72.5 °C

t-butyl methyl ether (290 ml), ethanol (40 ml) and ethyl malonate (70.04 g, 0.437 mol) were added to magnesium ethoxide (50.00 g, 0.437 mol), which was heated to reflux for 30 minutes and returned to room temperature (hereinafter, abbreviated as Solution A). Thionyl chloride (104.04 g, 0.875 mol) was added to 4-nitrophenylacetic acid (66.00 g, 0.364 mol), which was stirred at 70-75° C. for 45 minutes. Thionyl chloride was distilled off under reduced pressure, followed by azeotropy with toluene (66 ml) two times. t-butyl methyl ether (132 ml) was added to the azeotropic residue to dissolve it, which was added dropwise to Solution A. After stirred at 65° C. for 30 minutes, the mixture was cooled to room temperature, and 2N hydrochloric acid (264 ml) was added thereto dropwise under cooling. The organic layer was separated, the aqueous layer was reverse-extracted with t-butyl methyl ether (132 ml), the organic layers were combined, and the solvent was distilled off under reduced pressure. Acetic acid (111 ml), water (74 ml) and concentrated sulfuric acid (14 ml) were added to the concentrated residue, and the mixture was refluxed at an outer temperature of 125° C. for 5 hours while stirring vigorously. After completion of the reaction, the mixture was ice-cooled, returned to room temperature, and t-butyl methyl ether (264 ml) and water (264 ml) were added thereto, followed by extraction. An aqueous saturated sodium hydrogen carbonate solution (264 ml) and ethyl acetate (80 ml) were added to the organic layer to wash the layer, followed by further washing with an aqueous saturated sodium bicarbonate solution (264 ml). After washed with brine (264 ml) twice, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography to give 4-nitrophenylacetone (48.96 g, 0.273 mol, 75%).

1. temperaturewas heated
2. temperatureto reflux for 30 minutes
3. customreturned to room temperature
4. distillationThionyl chloride was distilled off under reduced pressure
5. additiont-butyl methyl ether (132 ml) was added to the azeotropic residue
6. dissolutionto dissolve it, which
7. additionwas added dropwise to Solution A
8. stirringAfter stirred at 65° C. for 30 minutes
9. temperaturethe mixture was cooled to room temperature
10. addition2N hydrochloric acid (264 ml) was added
11. temperaturedropwise under cooling
12. customThe organic layer was separated
13. extractionthe aqueous layer was reverse-extracted with t-butyl methyl ether (132 ml)
14. distillationthe solvent was distilled off under reduced pressure
15. additionAcetic acid (111 ml), water (74 ml) and concentrated sulfuric acid (14 ml) were added to the concentrated residue
16. temperaturethe mixture was refluxed at an outer temperature of 125° C. for 5 hours
17. stirringwhile stirring vigorously
18. customAfter completion of the reaction
19. temperaturecooled
20. customreturned to room temperature
21. extractionfollowed by extraction
22. additionAn aqueous saturated sodium hydrogen carbonate solution (264 ml) and ethyl acetate (80 ml) were added to the organic layer
23. washto wash the layer
24. washby further washing with an aqueous saturated sodium bicarbonate solution (264 ml)
25. washAfter washed with brine (264 ml) twice
26. distillationthe solvent was distilled off under reduced pressure
27. customthe residue was purified by silica gel column chromatography

ORD-Eintrag

ord-fba89ff57d6a4cfab03b9d39be8ead71

Quelldatensatz

uspto-grants-2005_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06849738B2