Cesium carbonate → N-[3-(4-amino-2-nitrophenoxy)phenyl]-2,2,2-trifluoroacetamide

Temperatur

120 °C

To a solution of 2,2,2-trifluoro-N-(3-hydroxyphenyl)acetamide (5.0 g, 24.4 mmol) and 4-fluoro-3-nitroaniline (3.8 g, 24.4 mmol) in N,N-dimethylformamide (100 mL) was added cesium carbonate (8.0 g, 24.5 mmol), and the mixture was stirred at 120° C. for 16 hr. The reaction mixture was cooled to room temperature, insoluble material was filtered off, and the filtrate was diluted with ethyl acetate (250 mL), washed successively with water (250 mL) and saturated brine (250 mL×2), and dried over anhydrous sodium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=30/70→70/30), and the obtained solution was concentrated under reduced pressure to give the title compound (3.03 g, 36%) as a yellow powder.

1. temperatureThe reaction mixture was cooled to room temperature
2. filtrationinsoluble material was filtered off
3. additionthe filtrate was diluted with ethyl acetate (250 mL)
4. washwashed successively with water (250 mL) and saturated brine (250 mL×2)
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationInsoluble material was filtered off
7. concentrationthe filtrate was concentrated under reduced pressure
8. customThe obtained residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=30/70→70/30)
9. concentrationthe obtained solution was concentrated under reduced pressure

ORD-Eintrag

ord-a72fad7bf5c7469aa17d5d351313c7ca

Quelldatensatz

uspto-grants-2012_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08143258B2