Dimethylamine → N-[(1R)-3-(Dimethylamino)-1-(hydroxymethyl)-3-oxopropyl]carbamic acid phenylmethyl ester

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A solution of (R)-benzyl-5-oxotetrahydrofuran-3-ylcarbamate (INTERMEDIATE 3, 18.4 g, 7.8 mmol) in THF (100 ml) was purged, at room temperature, with gaseous dimethylamine for 5 minutes. After stirring at room temp for 14 hours, the reaction mixture was concentrated to dryness, and purified by column chromatography (silica gel, eluting first with 50% ethyl acetate/hexanes followed by 100% acetone) to give the title product (20 g, yield: 91.5%).

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