[NH2:1]C(OCC)=O.C(=O)([O-])[O-].[K+].[K+].[CH3:13][O:14][CH2:15][CH:16]1[CH2:20][O:19][C:18](=O)[O:17]1>CN(C)C=O>[CH3:13][O:14][CH2:15][CH:16]1[O:17][C:18](=[O:19])[NH:1][CH2:20]1Urethane (10.0 g, 113 mmol) was dissolved in N,N-dimethylformamide (40 ml), and thereto were added potassium carbonate (20.8 g, 151 mmol) and 4-methoxymethyl-1,3-dioxolan-2-one (10.0 g, 75.7 mmol), in order. The mixture was stirred for 100 hours at 140° C. under an atmosphere of argon. After filtering off the insoluble materials, the filtrate was condensed in vacuo, and the residue was purified by silica gel chromatography give the subject 5-methoxymethyloxazolidin-2-one (2.3g, yield 23.1%).
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