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Triethylamine (1.47 g, 14.57 mmol) and methanesulfonyl chloride (1.25 g, 10.93 mmol) were added to a solution of rac-(4R,5S)-4-(hydroxymethyl)-1-(4-methoxybenzyl)-5-methylpyrrolidin-2-one (1.8 g, 7.29 mmol) in DCM (36 mL) at 0° C. The mixture was stirred at 0° C. for 1 hour, and then water (70 mL) was added and the mixture was extracted with ethyl acetate (100 mL×3). The combined organic layers were dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (ethyl acetate/petroleum ether) to afford [(2R,3S)-1-(4-methoxybenzyl)-2-methyl-5-oxopyrrolidin-3-yl]methyl rac-methanesulfonate. MS ESI calc'd. for C15H22NO5S [M+H]+ 328. found 328. 1H NMR (400 MHz, CDCl3): δ 7.17 (d, J=8.4 Hz, 2H), 6.86 (d, J=8.4 Hz, 2H), 4.96-4.91 (m, 1H), 4.10-4.05 (m, 2H), 3.91-3.86 (m, 1H), 3.81 (s, 3H), 3.36-3.30 (m, 1H), 2.92 (s, 3H), 2.76-2.68 (m, 1H), 2.39-2.29 (m, 1H), 2.27-2.20 (m, 1H), 1.24 (d, J=6.4 Hz, 3H).

1. extractionthe mixture was extracted with ethyl acetate (100 mL×3)
2. dry with materialThe combined organic layers were dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by chromatography on silica gel (ethyl acetate/petroleum ether)