4-Aminophenol → HCID 57541500, compound

Temperature

80 °C

At room temperature, p-aminophenol (0.51 g, 4.70 mmol, 1 eq) was dissolved in N,N-dimethylformamide (10 mL). To the resulted solution, potassium tert-butoxide (0.53 g, 4.70 mmol, 1 eq) was added in portions and the resulted mixture was stirred for 0.5 hours. Tert-butyl 4-chloropicolinate (1 g, 4.70 mmol, 1 eq) and potassium carbonate (45 mg, 0.33 mmol, 0.07 eq) were added, and the mixture was heated to 80° C. and stirred for 2 hours. The mixture was cooled to room temperature and ethyl acetate (50 mL) was added. The mixture was filtered to remove the undissolved material and the filtrate was washed with saturated brine (20 mL×2). The organic phase was dried over anhydrous sodium sulfate, concentrated under reduced pressure to remove the solvent. The residue was purified by column chromatography (dichloromethane:ethyl acetate=30:1) to give the title compound (805 mg, purity 96%, yield 60%).

1. stirringstirred for 2 hours
2. temperatureThe mixture was cooled to room temperature
3. filtrationThe mixture was filtered
4. customto remove the undissolved material
5. washthe filtrate was washed with saturated brine (20 mL×2)
6. dry with materialThe organic phase was dried over anhydrous sodium sulfate
7. concentrationconcentrated under reduced pressure
8. customto remove the solvent
9. customThe residue was purified by column chromatography (dichloromethane:ethyl acetate=30:1)

ORD record

ord-9939d6ac1b1f415b824086b9150f9eca

Source dataset

uspto-grants-2015_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09078933B2