Phenethyl bromide → HCID 9909367, compound

HRID 1636893Notes

Reaction equation

[CH:1]1[C:9]2[C:8]3[CH:10]=[CH:11][CH:12]=[CH:13][C:7]=3[O:6][C:5]=2[CH:4]=[CH:3][C:2]=1[C:14](=[O:22])[CH:15]([F:21])[CH:16]([F:20])[C:17]([OH:19])=[O:18].C([N-]C(C)C)(C)C.[Li+].[CH2:31](Br)[CH2:32][C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1>O1CCCC1>[CH:1]1[C:9]2[C:8]3[CH:10]=[CH:11][CH:12]=[CH:13][C:7]=3[O:6][C:5]=2[CH:4]=[CH:3][C:2]=1[C:14](=[O:22])[CH:15]([F:21])[C:16]([F:20])([CH2:31][CH2:32][C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1)[C:17]([OH:19])=[O:18]

Participants

Conditions

Temperature: -78 °C

Procedure

To a solution of 4-dibenzofuran-2-yl-2,3-difluoro-4-oxo-butyric acid (1 equivalent, Example 6) in tetrahydrofuran cooled to -78° C. is added dropwise a solution of lithium diisopropylamide (2 equivalents). After stirring at -78° C. for 30 minutes, a solution of phenethyl bromide (1 equivalent) in tetrahydrofuran is added. The cooling bath is removed, and the reaction mixture gradually warms to room temperature and is stirred overnight. To this solution is added aqueous HCl (1 M) and ethyl acetate. The layers are separated, and the organic portion is washed with brine, dried (MgSO4), and concentrated in vacuo. The title compound is obtained by separation from the reaction by-product using silica gel chromatography (elution with chloroform/methanol).

Workup

customThe cooling bath is removed
customgradually warms to room temperature
stirringis stirred overnight
additionTo this solution is added aqueous HCl (1 M) and ethyl acetate
customThe layers are separated
washthe organic portion is washed with brine
dry with materialdried (MgSO4)
concentrationconcentrated in vacuo

Sources & evidence

ORD record: ord-4396593bd6f14b1181c32e54f53dcc04
Source dataset: uspto-grants-2000_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06037361

Reaction notes

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