Diethyl Oxalate → Ethyl 2,4-dioxo-4-(3,4,5-trifluorophenyl)butanoate

HRID 1855471Notes

Reaction equation

CC(C)([O-])C.[K+].[F:7][C:8]1[CH:9]=[C:10]([C:16](=[O:18])[CH3:17])[CH:11]=[C:12]([F:15])[C:13]=1[F:14].[C:19](OCC)(=[O:25])[C:20]([O:22][CH2:23][CH3:24])=[O:21]>C(OCC)C>[O:25]=[C:19]([CH2:17][C:16](=[O:18])[C:10]1[CH:9]=[C:8]([F:7])[C:13]([F:14])=[C:12]([F:15])[CH:11]=1)[C:20]([O:22][CH2:23][CH3:24])=[O:21]

Participants

Conditions

Temperature: 0 °C

Procedure

Potassium tert.-butoxide (1.12 g, 10.0 mmol) was added to a solution of 1-(3,4,5-trifluoro-phenyl)-ethanone (1.74 g, 10.0 mmol) and diethyl oxalate (1.49 mL, 11.0 mmol) in diethyl ether (20 mL) cooled to 0° C. The heterogenous mixture was stirred for 15 min at 0° C. followed by 15 h at 20° C. The mixture was partitioned between 3 N hydrochloric acid (20 mL) and diethyl ether (50 mL). The organic layer was washed with brine (20 mL), dried over sodium sulfate and evaporated under reduced pressure and the residual oil was crystallized from diethyl ether/heptane to give the title compound as a white solid.

Workup

waitfollowed by 15 h at 20° C
customThe mixture was partitioned between 3 N hydrochloric acid (20 mL) and diethyl ether (50 mL)
washThe organic layer was washed with brine (20 mL)
dry with materialdried over sodium sulfate
customevaporated under reduced pressure
customthe residual oil was crystallized from diethyl ether/heptane

Sources & evidence

ORD record: ord-316803638d2a4065bcf714925f59f872
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08962834B2

Reaction notes

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