Hydrochloric Acid → 2-Hydroxy-3-phenylcarbonyloxypropyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate hydrochloride

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2-Hydroxy-3-phenylcarbonyloxypropyl (2S)-3-(3,4-dihydroxyphenyl)-2-[(tert-butoxy)carbonylamino]propanoate (2.05 g, 4.3 mmol) was treated with 4.0M HCl in 1,4-dioxane at room temperature for 30 min. The reaction mixture was concentrated to dryness under reduced pressure and purified by prep-HPLC. The HPLC fractions were pooled, treated with 10 mL of 0.5N HCl, and dried by lyophilization to yield 0.85 g (48%) of the title compound as a white solid. 1H NMR (400 MHz, D2O): δ 3.11 (t, J=6.6 Hz, 2H), 4.38-4.44 (m, 6H), 6.60 (dd, J=2.2, 7.8 Hz, 1/2H), 6.61 (dd, J=2.4, 8.0 Hz, 1/2H), 6.70 (d, J=2.0 Hz, 1/2H), 6.71 (d, J=2.0 Hz, 1/2H), 6.77 (d, J=8.0 Hz, 1/2H), 6.78 (d, J=8.0 Hz, 1/2H), 7.46-7.52 (m, 2H), 7.60-7.68 (m, 1H), 7.96-8.02 (m, 2H); MS (ESI) m/z 376.15 (M+H)+.

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