Hydrochloric Acid → 2-Fluoro-4-chloro-5-(2-methylcyclopentyl)oxyaniline

Temperature

90 °C

A solution of methyl N-(2-fluoro-4-chloro-5-hydroxyphenyl)carbamate (1.53 g, 6.98 mmol) synthesized by the process described in Reference Example 8, 2-methylcyclopentyl p-toluenesulfonate (1.78 g, 6.99 mmol) and N,N-dimethylformamide (15 ml) was charged into a 50 cc round-bottom flask, and then potassium hydroxide (400 mg, 7.15 mmol) in a powder form was added thereto, followed by stirring for 7 hours while heating on an oil bath at 80 to 100° C. After completion of the reaction, the reaction solution was cooled to room temperature, 2N hydrochloric acid (50 ml) was added thereto, and the mixture was extracted with ethyl acetate (20 ml×8). The organic layers were combined, washed with a saturated aqueous solution of sodium chloride and dried over anhydrous magnesium sulfate. The drying agent was removed by filtration, and the solvent was distilled off under reduced pressure to obtain a crude product (1.51 g). The product was purified by silica gel column chromatography (development solvent: hexane/ethyl acetate=17/3) to obtain 2-fluoro-4-chloro-5-(2-methylcyclopentyl)oxyaniline as a colorless oily substance (668 mg, 2.73 mmol, 40% yield).

1. additionwas charged into a 50 cc round-bottom flask
2. customAfter completion of the reaction
3. temperaturethe reaction solution was cooled to room temperature
4. extractionthe mixture was extracted with ethyl acetate (20 ml×8)
5. washwashed with a saturated aqueous solution of sodium chloride
6. dry with materialdried over anhydrous magnesium sulfate
7. customThe drying agent was removed by filtration
8. distillationthe solvent was distilled off under reduced pressure
9. customto obtain a crude product (1.51 g)
10. customThe product was purified by silica gel column chromatography (development solvent: hexane/ethyl acetate=17/3)

ORD record

ord-2fb7d7382538431bbde6a08aa99fcc09

Source dataset

uspto-grants-1995_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05464811