Hydrochloric Acid → Methyl 4-(2-acetylaminophenyl)butanoate

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Methyl 4-(2-aminophenyl)butanoate hydrochloride (7.20 g, 0.037 mol) synthesized by a known method by documents (Synthetic communications, 26(18), 3443 (1996)) and triethylamine (5.06 g, 0.05 mol) were dissolved in tetrahydrofuran (60 ml). Acetyl chloride (3.51 g, 0.045 mol) was added dropwise to the mixture, which was stirred at room temperature for 30 minutes. Ethyl acetate and 1N hydrochloric acid were added to the reaction mixture, and extraction was conducted. The organic layer was washed with water, concentrated and dried. A mixed solution of ethyl acetate-n-hexane (1:1) was added to the residue. The crystallized product was collected by filtration, to give methyl 4-(2-acetylaminophenyl)butanoate (6.40 g) as a white powder.

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