Hydrochloric Acid → 4-[2-(Ethoxycarbonyl)vinyl]phenylacetic Acid

Temperatur

100 °C

To a stirred solution of 4-bromophenylacetic acid (43.0 g, 200 mmol) in dimethyl formamide (400 mL) in a round bottom flask under nitrogen atmosphere at room temperature was added ethyl acrylate (43.3 mL, 400 mmol), palladium diacetate (0.90 g, 4 mmol), triphenylphosphine (2.10 g, 8 mmol), and diisopropylethylamine (87.2 mL, 500 mmol). The reaction mixture was heated to 100° C. for 43 hours, cooled to room temperature, and hydrochloric acid (1N, 1 L) was added. To the reaction mixture was added ethyl acetate (500 mL), the aqueous layer was extracted with ethyl acetate (2×500 mL), and the combined organic layers washed with hydrochloric acid (1N, 500 mL), water (500 mL) and saturated sodium chloride solution (250 mL), then dried over sodium sulfate, filtered and evaporated in vacuo to provide the title compound as a mixture of cis and trans isomers (46.9 g, 100%).

1. temperaturecooled to room temperature
2. extractionthe aqueous layer was extracted with ethyl acetate (2×500 mL)
3. washthe combined organic layers washed with hydrochloric acid (1N, 500 mL), water (500 mL) and saturated sodium chloride solution (250 mL)
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. customevaporated in vacuo

ORD-Eintrag

ord-ae3a27a6a14e4911884c7cdd1a995f47

Quelldatensatz

uspto-grants-2003_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06613911B2