Hydrochloric Acid → Benzene, 1-(1,1-dimethylethoxy)-4-fluoro-2-nitro-

A tetrahydrofuran (THF) solution (20 ml) of potassium tert-butoxide (3.55 g, 31.6 mmol) was cooled in an methanol-ice bath, and 4.2 g of 2,5-difluoronitrobenzene (26.4 mmol) was further added. The mixture was heated to room temperature, stirred for 96 hours, and further stirred at 60° C. for 1 hour. Water (2 ml) and 2N-hydrochloric acid (2 ml) were added to the reaction mixture while cooling with an ice water bath, and subsequently water was added. The resulting mixture was extracted with ethyl acetate. The organic layer was concentrated under reduced pressure, and the residue was then purified using silica gel column chromatography (n-hexane:ethyl acetate=19:1). The purified product was concentrated under reduced pressure to thereby obtain 4.5 g of oily orange 1-tert-butoxy-4-fluoro-2-nitrobenzene (yield: 80%).

1. stirringfurther stirred at 60° C. for 1 hour
2. temperaturewhile cooling with an ice water bath
3. extractionThe resulting mixture was extracted with ethyl acetate
4. concentrationThe organic layer was concentrated under reduced pressure
5. customthe residue was then purified
6. concentrationThe purified product was concentrated under reduced pressure

ORD record

ord-9cfdd2a16e4d463b95b4f6c6c8521f5c

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09045464B2