[CH3:1][S:2](Cl)(=[O:4])=[O:3].C(N(CC)CC)C.[CH3:13][O:14][C:15]1[CH:30]=[C:29]([O:31][CH3:32])[CH:28]=[CH:27][C:16]=1[CH2:17][N:18]1[CH2:22][C:21]([CH2:24][OH:25])([CH3:23])[CH2:20][C:19]1=[O:26]>C(Cl)Cl.O>[CH3:1][S:2]([O:25][CH2:24][C:21]1([CH3:23])[CH2:20][C:19](=[O:26])[N:18]([CH2:17][C:16]2[CH:27]=[CH:28][C:29]([O:31][CH3:32])=[CH:30][C:15]=2[O:14][CH3:13])[CH2:22]1)(=[O:4])=[O:3]Methanesulfonyl chloride (305 mg, 2.65 mmol) and triethylamine (540 mg, 5.35 mmol) were added to a solution of 1-(2,4-dimethoxybenzyl)-4-(hydroxymethyl)-4-methylpyrrolidin-2-one (500 mg, 1.75 mmol) in DCM (5 mL) at 0° C. The mixture was stirred at room temperature for 16 hours and then diluted with water and extracted with ethyl acetate. The organic layer was dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (ethyl acetate/petroleum ether) to give [1-(2,4-dimethoxybenzyl)-3-methyl-5-oxopyrrolidin-3-yl]methyl methanesulfonate. MS ESI calc'd. for C16H24NO6S [M+H]+ 358. found 358. 1H NMR (400 MHz, CDCl3): δ 7.15 (d, J=8.4 Hz, 1H), 6.46-6.44 (m, 2H), 4.41 (s, 2H), 4.02-3.96 (m, 2H), 3.81 (s, 3H), 3.80 (s, 3H), 3.22 (d, J=6.4 Hz, 1H), 2.99-2.95 (m, 4H), 2.41 (d, J=16.8 Hz, 1H), 2.24 (d, J=16.8 Hz, 1H), 1.19 (s, 3H).
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