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A mixture of (E)-4-(pyridin-4-ylmethyleneamino) isobenzofuran-1(3H)-one (1.71 g, 7.18 mmol) and benzaldehyde (837 mg, 7.9 mmol) in ethyl propionate (50 mL) was cooled to 0° C. Then a solution of sodium ethoxide in ethanol [sodium (660 mg, 28.7 mmol) in ethanol (35 mL)] was added drop-wise. After the addition, the mixture was stirred at room temperature for 2 hr. The mixture was quenched with water (20 mL) and solvent was removed in vacuum. The residue was dissolved in water, and then extracted with ethyl acetate (150 mL×4). The combined organic layers were washed with brine, dried over anhydrous sodium sulfate, and concentrated to give crude product. The crude product was purified by chromatography (silica gel, petroleum ether/ethyl acetate=5:1 to 1:1) to give ethyl 4-oxo-3-phenyl-2-(pyridin-4-yl)-1,2,3,4-tetrahydroquinoline-5-carboxylate (340 mg, yield 13%). LC-MS (ESI) m/z: 373 (M+1)+.

1. additionAfter the addition
2. customThe mixture was quenched with water (20 mL) and solvent
3. customwas removed in vacuum
4. dissolutionThe residue was dissolved in water
5. extractionextracted with ethyl acetate (150 mL×4)
6. washThe combined organic layers were washed with brine
7. dry with materialdried over anhydrous sodium sulfate
8. concentrationconcentrated
9. customto give crude product
10. customThe crude product was purified by chromatography (silica gel, petroleum ether/ethyl acetate=5:1 to 1:1)