反应详情

To a mixture of methyl 4-(cyanoacetyl)benzoate (10.29 g), p-toluenesulfonyl chloride (11.58 g) and dichloromethane (110 mL) was added dropwise triethylamine (7.68 g) under ice-cooling. After stirring under ice-cooling for 2.5 hrs, the mixture was diluted with dichloromethane (100 mL), washed with water (150 mL), dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (eluent, hexane:methyl acetate=9:1→1:1) to give the title compound (17.60 g) as a mixture of (E)-form and (Z)-form (6:5).

1. temperaturecooling
2. temperaturecooling for 2.5 hrs
3. washwashed with water (150 mL)
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (eluent, hexane:methyl acetate=9:1→1:1)