Diisopropylethylamine → Ethyl 4-(4-chlorophenyl)-3-oxobutanoate

Temperature

60 °C

To a suspension of potassium ethyl malonate (17.12 g, 100.6 mmol) in acetonitrile (150 mL) were added N,N-diisopropylethylamine (28 mL, 160 mmol) and magnesium chloride (12.11 g, 127.2 mmol). The resulting mixture was stirred for 1 hour. A solution of 4-chlorophenylacetyl chloride (10.12 g, 53.53 mmol) in acetonitrile (100 mL) was then added and the mixture was heated to 60° C. and stirred for 20 hours. The mixture was cooled to room temperature and concentrated under reduced pressure. The residue was suspended in 1N aqueous HCl (250 mL) and was extracted with EtOAc (100 mL×2). The combined organic phases were dried Over anhydrous MgSO4 and insoluble materials were removed by filtration. The filtrate was concentrated under reduced pressure and the residue was purified by column chromatography on silica, elution with a 0%-80% mixture of EtOAc in hexane (linear gradient, 45 min) to obtain ethyl 4-(4-chlorophenyl)-3-oxobutanoate (5.0 g, 39%) as a yellow oil. LC/MS (FA) ES− 239. 1H NMR (d6-DMSO, 400 MHz): δ: 7.37 (2H, d, J=13.8 Hz), 7.20 (2H, d, J=13.8 Hz), 4.07 (2H, q, J=7.2 Hz), 3.89 (2H, s), 3.66 (2H, s), 1.17 (3H, t, J=7.2 Hz).

1. stirringstirred for 20 hours
2. temperatureThe mixture was cooled to room temperature
3. concentrationconcentrated under reduced pressure
4. extractionwas extracted with EtOAc (100 mL×2)
5. dry with materialThe combined organic phases were dried Over anhydrous MgSO4 and insoluble materials
6. customwere removed by filtration
7. concentrationThe filtrate was concentrated under reduced pressure
8. customthe residue was purified by column chromatography on silica, elution with a 0%-80% mixture of EtOAc in hexane (linear gradient, 45 min)

ORD record

ord-bb24f4dedfaa4fc08fa0c4fa51adaefc

Source dataset

uspto-grants-2014_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08796268B2