Acetic Acid → 4-Ethoxycarbonylfuran-2-carboxylic acid

3-Furancarboxylic acid ethyl ester (1.4 g, 10.0 mmol) was dissolved in acetic acid (10 mL), bromine (1.6 g, 10.0 mmol) was added, and the mixture was stirred overnight. The solvent was evaporated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=80/20). The obtained crude fraction was dissolved in N,N-dimethylformamide (15 mL), palladium acetate (0.18 g, 0.78 mmol), triphenylphosphine (0.41 g, 1.55 mmol), triethylamine (2.2 mL, 15.5 mmol), and water (0.7 mL, 38.8 mmol) were added, and the mixture was stirred at 80° C. overnight under a carbon monoxide atmosphere. 1N Hydrochloric acid was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The obtained residue was purified by high performance liquid chromatography to give the title compound (0.47 g).

1. customThe solvent was evaporated under reduced pressure
2. customthe obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate=80/20)
3. customThe obtained crude fraction
4. stirringthe mixture was stirred at 80° C. overnight under a carbon monoxide atmosphere
5. extractionthe mixture was extracted with ethyl acetate
6. washThe extract was washed with saturated brine
7. dry with materialdried over anhydrous sodium sulfate
8. concentrationconcentrated under reduced pressure
9. customThe obtained residue was purified by high performance liquid chromatography

ORD-Eintrag

ord-c374a461fb674ca48a3a55051d3c3d7a

Quelldatensatz

uspto-grants-2015_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09115107B2