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0 °C

A mixture of 4-(4-isobutyrylpiperazine-1-carbonyl)benzaldehyde (950 mg, 3.3 mmol) and (E)-4-(4-(diethoxymethyl)benzylideneamino)isobenzofuran-1(3H)-one (1.018 g, 3 mmol) in ethyl propionate (40 mL) was cooled to 0° C. Then a solution of sodium methoxide in methanol [sodium (345 mg, 12 mmol) in methanol (8 mL)] was added dropwise. After the addition, the mixture was stirred at room temperature for 24 hr. The mixture was quenched with water (10 mL) and solvent was removed in vacuum. The residue was dissolved in water, and then extracted with ethyl acetate (100 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=10:1 to 1:10) to give methyl 2-(4-(diethoxymethyl)phenyl)-3-(4-(4-isobutyrylpiperazine-1-carbonyl)phenyl)-4-oxo-1,2,3,4-tetrahydroquinoline-5-carboxylate (491 mg, yield 25%).

1. additionAfter the addition
2. customThe mixture was quenched with water (10 mL) and solvent
3. customwas removed in vacuum
4. dissolutionThe residue was dissolved in water
5. extractionextracted with ethyl acetate (100 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=10:1 to 1:10)