C(O[C:4]([C:6]1[CH:7]=[C:8]2[CH:14]=[CH:13][O:12][C:9]2=[CH:10][N:11]=1)=[O:5])C.[O-]CC.[Na+].[C:19]([O:22][CH2:23][CH3:24])(=[O:21])[CH3:20].C(O)(=O)C>C1(C)C=CC=CC=1.O>[O:5]=[C:4]([C:6]1[CH:7]=[C:8]2[CH:14]=[CH:13][O:12][C:9]2=[CH:10][N:11]=1)[CH2:20][C:19]([O:22][CH2:23][CH3:24])=[O:21]5-Ethoxycarbonylfuro[2,3-c]pyridine(956 mg, 5.0 mmol) was dissolved in 10 mL of toluene, 510 mg (7.5 mmol) of sodium ethoxide was added at room temperature to the solution, and 661 mg (7.5 mmol) of ethyl acetate was then added dropwise at room temperature with stirring. After all the ethyl acetate had been added, the reaction mixture was heated to 80° C., and a reaction was carried out for 4 hours. The reaction solution was then cooled to 5° C. and was neutralized with 450 mg (7.5 mmol) of acetic acid as the temperature was held 5-10° C., the solution was stirred for 30 minutes as the temperature was maintained, 1 mL water was then added, and the solution was returned to room temperature. The organic layer was separated, the aqueous layer was extracted twice with 5 mL of methylene chloride, and the combined organic layer was dried with anhydrous magnesium sulfate and then concentrated in a rotary evaporator, and the resulting solids were recrystallized from a mixed solvent of toluene-hexane, giving 840 mg (72% yield) of ethyl β-oxo-5-furo[2,3-c]pyridinepropionate in a purity of 99% by HPLC.
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