6-Aminohexanoic Acid → Methyl 6-aminohexanoate

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Reaction Steps

To a suspension of 6-aminohexanoic acid (10.0 g, 76.2 mmol) in methanol (300 mL), was added 5.51 g of concentrated sulfuric acid. The mixture was heated and reacted for 8 hours, while the water formed along with the progress of esterification distilled off with methanol and 60 mL of methanol was added four times on cue. The reaction mixture was cooled, and the pH of the mixture was adjusted to 6.2 by adding 28% methanol solution of sodium methoxide. The solvent was distilled off, the residue was added to 500 mL of water, and the pH of the mixture was adjusted to 10.3 by adding sodium carbonate. After extraction with 350 mL of dichloromethane for three times, the extract was dried over anhydrous magnesium sulfate. Thereafter, the solvent was distilled off, thereby to yield methyl 6-aminohexanoate.

Provenance & Evidence