[O:1]1CCO[CH:2]1[CH2:6][N:7]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([CH3:17])[CH:15]=2)[CH:10]=[CH:9][C:8]1=[O:18].FC(F)(F)C(O)=O.C(=O)([O-])O.[Na+]>C(OCC)(=O)C>[CH3:17][C:14]1[CH:15]=[C:16]2[C:11]([CH:10]=[CH:9][C:8](=[O:18])[N:7]2[CH2:6][CH:2]=[O:1])=[CH:12][CH:13]=1To 0.37 g of 1-(1,3-dioxolan-2-ylmethyl)-7-methylquinolin-2(1H)-one, 3.7 mL of a 90% aqueous trifluoroacetic acid solution was added, the mixture was stirred at room temperature for 1 hour, and the solvent was removed under reduced pressure. The residue thus obtained was added with ethyl acetate and an aqueous saturated sodium hydrogen carbonate solution. The organic layer was separated, and the aqueous layer was extracted twice with ethyl acetate. The organic layer and an extract were combined, the resultant solution was washed with an aqueous saturated sodium chloride solution and dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure to obtain 0.32 g of a brown oily substance, (7-methyl-2-oxoquinolin-1(2H)-yl)acetaldehyde.
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