[CH3:1][N:2]1[CH2:6][CH2:5][N:4]([CH2:7][CH2:8][OH:9])[C:3]1=[O:10].[C:11](OC(=O)C)(=[O:13])[CH3:12].C(N(CC)CC)C>ClCCl.CN(C)C1C=CN=CC=1>[CH3:1][N:2]1[CH2:6][CH2:5][N:4]([CH2:7][CH2:8][O:9][C:11](=[O:13])[CH3:12])[C:3]1=[O:10]Reaction of 1-methyl-3-(2-hydroxyethyl)-2-imidazolidinone (13 g) with acetic anhydride (9.2 g) in dichloromethane (60 ml) in the presence of triethylamine (9 g) and 4-dimethylaminopyridine (0.1 g) for 18 hours at ambient temperature gave 1-methyl-3-(2-acetoxyethyl)-2-imidazolidinone as an oil.
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