Hydrochloric Acid → HCID 28401656, Verbindung

Concentrated hydrochloric acid (5.8 ml) was added to an ethanol solution (100 ml) of N-(5-bromo-2-cyclopentyloxyphenyl)acetamide (3.4 g, 11.4 mmol), and the resulting mixture was stirred for 3 hours while heating under reflux. After the reaction mixture was cooled to room temperature, a 5N sodium hydroxide solution (14.2 ml) was added to obtain a pH of 11. The resulting mixture was then extracted with dichloromethane. The organic layer was washed with a saturated sodium chloride aqueous solution, and then concentrated under reduced pressure. The residue was then purified by silica gel column chromatography (n-hexane:ethyl acetate=4:1). The purified product was concentrated under reduced pressure to thereby obtain 2.97 g of oily pale yellow 5-bromo-2-cyclopentyloxyaniline (yield: 100%).