[OH:1][CH:2](CO)[CH2:3][C:4]1[C:5]([O:16][CH3:17])=[CH:6][C:7]2[CH2:12][O:11][C:10](=[O:13])[N:9]([CH3:14])[C:8]=2[CH:15]=1.O.I([O-])(=O)(=O)=O.[Na+]>O1CCCC1.CO.C(OCC)(=O)C>[CH3:17][O:16][C:5]1[C:4]([CH2:3][CH:2]=[O:1])=[CH:15][C:8]2[N:9]([CH3:14])[C:10](=[O:13])[O:11][CH2:12][C:7]=2[CH:6]=1280 mg of 7-(2,3-dihydroxypropyl)-6-methoxy-1-methyl-1,4-dihydrobenz[d][1,3]oxazin-2-one was dissolved in 4 ml of tetrahydrofuran and 4 ml of methanol. Thereafter, 8 ml of water containing 0.29 g of sodium metaperiodate was added to the reaction solution while cooling on ice, and the obtained mixture was then stirred at room temperature for 30 minutes. The reaction solution was diluted with ethyl acetate and then washed with a saturated sodium chloride aqueous solution. The organic layer was dried over magnesium sulfate and then concentrated under a reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate), so as to obtain 167 mg of (6-methoxy-1-methyl-2-oxo-1,4-dihydro-2H-benz[d][1,3]oxazin-7-yl)acetaldehyde.
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