[H-].[Na+].[CH3:3]N(C)C=O.[OH:8][CH2:9][C:10]1[O:15][CH2:14][N:13]([C:16]([CH3:24])([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[CH3:17])[C:12](=[O:25])[C:11]=1[C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1.CI>O>[CH3:3][O:8][CH2:9][C:10]1[O:15][CH2:14][N:13]([C:16]([CH3:17])([C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[CH3:24])[C:12](=[O:25])[C:11]=1[C:26]1[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1Sodium hydride (60% in oil, 0.11 g) was suspended in diformaldahyde (2 ml), cooled with ice; then a dimethylformamide solution (6 ml) of 6-hydroxymethyl-3-(1-methyl-1-phenylethyl)-5-phenyl-2,3-dihydro-4H-1,3-oxazin-4-one (Compound No. 53, 0.8 g) was added slowly thereto. After stirring the mixture, methyl iodide (0.71 g) was added, and the mixture was stirred again at room temperature. The reaction mixture was poured into water, and extracted with ethyl acetate. The organic layer was rinsed with saturated saline solution, and dried with magnesium sulfate, and the solvent was evaporated. The crude product was purified by silica gel chromatography to afford the captioned compound (0.56 g, yield 67%).
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