Ammonia → 2-[(2R)-2-({[tert-butyl(dimethyl)silyl]oxy}methyl)-5-oxo-1-pyrrolidinyl]acetamide

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Reaction Steps

To a solution of the compound 66 (13.7 g) in methanol (91 mL) was added 28% ammonia (91 mL) at room temperature and the solution was stirred overnight. The reaction solution was concentrated. Brine and ethyl acetate were added thereto and the solution was separated. The aqueous layer was extracted with ethyl acetate. The combined organic layer was dried over anhydrous sodium sulfate and concentrated. The obtained residue was purified by column chromatography on silica gel (ethyl acetate:methanol=1:0→97:3→95:5→90:10) to give the title compound (10.1 g) having the following physical data.

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