反应详情

To a solution of methyl (E)-3-[4-(4-methylphenyl)-thiophen-2-yl)acrylate (2.40 g) in tetrahydrofuran (50 ml) was added 2N sodium hydroxide (6.0 ml) at room temperature, and the mixture was stirred for 6 days. Precipitated crystal was collected by filtration and washed with tetrahydrofuran. To the crystals was added 1N hydrochloric acid (20 ml), and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated sodium chloride solution, dried with magnesium sulfate and concentrated under reduced pressure to give (E)-3-[4-(4-methylphenyl)thiophen-2-yl]acrylic acid (1.24 g) as pale yellow crystals.

1. customPrecipitated crystal
2. filtrationwas collected by filtration
3. washwashed with tetrahydrofuran
4. additionTo the crystals was added 1N hydrochloric acid (20 ml)
5. extractionthe mixture was extracted with ethyl acetate
6. washThe organic layer was washed with saturated sodium chloride solution
7. dry with materialdried with magnesium sulfate
8. concentrationconcentrated under reduced pressure