Sodium Hydroxide → ((2R,3R)-3-benzyloxy-2-t-butoxycarbonylaminobutoxy)acetic acid

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Reaction Steps

A 2 N sodium hydroxide solution (250 mL) was added to a methanol (250 mL) solution of (R)-3-((R)-1-benzyloxyethyl)-5-oxomorpholine-4-carboxylic acid t-butyl ester (40 g), and stirring was continued for 3 hours at room temperature. The methanol was removed under a vacuum, and ether was added, and the aqueous layer was partitioned. The aqueous layer was washed with ether, and the pH was adjusted to approximately pH 4 with a 5% citric acid solution. The resultant was extracted twice with ethyl acetate and washed twice with water. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed under a vacuum, and the title compound (42.1 g) was obtained. The physical property values are as follows.

Provenance & Evidence