[H-].[Na+].COP([CH2:9][C:10]([O:12]C)=[O:11])(OC)=O.[CH3:14][O:15][C:16]1[CH:17]=[CH:18][CH:19]=[C:20]2[C:25]=1[N:24]=[C:23]([CH:26]=O)[CH:22]=[CH:21]2.O.[OH-].[Li+]>O1CCCC1.O>[CH3:14][O:15][C:16]1[CH:17]=[CH:18][CH:19]=[C:20]2[C:25]=1[N:24]=[C:23](/[CH:26]=[CH:9]/[C:10]([OH:12])=[O:11])[CH:22]=[CH:21]2To a suspension of sodium hydride (60%) (0.8 mg, 20.0 mmol) in tetrahydrofuran (80 mL) was added methyl 2-(dimethoxyphosphoryl)acetate (2.65 mg, 12 mmol) dropwise at 0° C. After the addition was completed, the mixture was stirred for 30 min at 0° C. A solution of 8-methoxyquinoline-2-carbaldehyde (1.87 g, 10.0 mmol) in tetrahydrofuran (20 mL) was then added dropwise over a period of 50 min. The mixture was stirred at 0° C. for 1 h. A solution of lithium hydroxide hydrate (1.26 g, 30.0 mmol) in water (20 mL) was added cautiously to the solution. The resulting mixture was stirred at room temperature overnight. The reaction mixture was concentrated under reduced pressure. To the residue was added water (20 mL), and the pH of the aqueous layer was then adjust to 4 with 1 N hydrogen chloride solution. The precipitate was collected by filtration and then dried in vacuum to give 1.9 g of the product as a white solid. MS (ESI): m/z 230.1 [M+H]+.
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