Methanesulfonic Acid → (2R)-2-phenylcarbonyloxypropyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)propanoate mesylate

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A solution of (2R)-2-phenylcarbonyloxypropyl (2S)-2-(tert-butoxycarbonyl)amino-3-(3,4-dihydroxyphenyl)propanoate 2 (10.5 g, 21.1 mmol) in 34 mL (6.0 eq) of 4.0 N HCl/1,4-dioxane was stirred at room temperature for 1 h. Methanesulfonic acid (1.48 mL, 22.8 mmol) was slowly added to the reaction mixture while stirred at room temperature. The solution was concentrated under vacuum to afford the mesylate salt 1 as a brown solid.

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