Hydrochloric Acid → (3R,4S)-4-[(R)-1-phenyl-ethylamino]-tetrahydrothiophene-3-carboxylic acid

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Reaction Steps

A solution of Preparation of (3R,4S)-4-[(R)-1-phenyl-ethylamino]-tetrahydrothiophene-3-carboxylic acid methyl ester (673 mg, 2.54 mmol) in tetrahydrofuran (5 mL) was treated with 1.0 M sodium hydroxide solution (5.0 mL, 5.0 mmol) and the heterogeneous mixture was stirred at room temperature. After 75 min, the now homogeneous solution was treated with 1.0 M hydrochloric acid (5.0 mL, 5.0 mmol) and concentrated in vacuo. The residue was dissolved in water and lyophilized to provide the product, along with sodium chloride, as a fluffy white solid (928 mg, quantitative), used without further purification.

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