Hydrochloric Acid → [2-Hydroxy-3-methyl-1-(3-oxo-propylcarbamoyl)-butyl]-carbamic acid benzyl ester

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To a solution of [1-(3,3-diethoxy-propylcarbamoyl)-2-hydroxy-3-methyl-butyl]-carbamic acid benzyl ester (350 mg, 0.854 mmol) in anhydrous tetrahydrofuran (2 ml) was added 0.5N hydrochloric acid (2 ml). The resulting solution was stirred for 20 minutes at room temperature. The aqueous layer was basified to pH 8 with sodium bicarbonate solution, and extracted with ethyl acetate (3×40 mL). The combined extracts were washed with saturated sodium chloride, dried over magnesium sulfate, filtered and concentrated in vacuo to provide [2-hydroxy-3-methyl-1-(3-oxo-propylcarbamoyl)-butyl]-carbamic acid benzyl ester (266 mg, 93%) as a white solid.

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