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A mixture of (E)-4-(4-((dimethylamino)methyl)benzylideneamino)isobenzofuran-1(3H)-one (588 mg, 2 mmol) and 4-chlorobenzaldehyde (281 mg, 2 mmol) in anhydrous ethyl propionate (25 mL) was cooled to 0° C. The sodium methoxide in methanol solution (sodium (115 mg, 5 mmol) in anhydrous ethanol (10 mL)) was added dropwise and the mixture was stirred at 25° C. for 3 hr. The resulting mixture was quenched with water (5 mL), and then evaporated under reduced pressure. The residue was extracted with ethyl acetate (100 mL×3) and the combined organic layers were dried over anhydrous sodium sulfate and concentrated to give crude product, which was purified by column chromatography (silica gel, dichloromethane to dichloromethane/methanol=30:1) to give the title compound (260 mg, yield 28%) as a yellow solid. LC-MS (ESI) m/z: 463 (M+1)+.

1. customThe resulting mixture was quenched with water (5 mL)
2. customevaporated under reduced pressure
3. extractionThe residue was extracted with ethyl acetate (100 mL×3)
4. dry with materialthe combined organic layers were dried over anhydrous sodium sulfate
5. concentrationconcentrated
6. customto give crude product, which
7. customwas purified by column chromatography (silica gel, dichloromethane to dichloromethane/methanol=30:1)