反应详情

温度

-20 °C

Methyl 3-(4-methoxyphenyl)propanoate (500 mg, 2.56 mmol) was dissolved in 30 mL of anhydrous dichloromethane. TiCl4 (2.1 mL, 19 mmol) and MeOCHCl2 (0.81 mL, 9.0 mmol) were added subsequently at −20° C. under Argon. The reaction mixture was stirred at −20° C. for 6 hours. Then the reaction mixture was slowly poured into a diluted hydrochloric acid solution. The dichloromethane layer was separated and washed with water followed by brine then dried over magnesium sulfate. The solvent was evaporated under reduced pressure. Then the crude residue was purified by column chromatography on silica gel (eluent: ethyl acetate/n-hexane=1/10) to obtain methyl 3-(3-formyl-4-methoxyphenyl)propanoate (ss-2) as a colorless oil (429 mg, 75% yield).

1. customThe dichloromethane layer was separated
2. washwashed with water
3. dry with materialthen dried over magnesium sulfate
4. customThe solvent was evaporated under reduced pressure
5. customThen the crude residue was purified by column chromatography on silica gel (eluent: ethyl acetate/n-hexane=1/10)