Water → 1-(3,4,5-Trimethoxybenzyl)-3-(4-(trifluoromethyl)phenylmethyl)-2-oxopyrrolidine

HRID 323431Notes

Reaction equation

[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:13]=[C:14]([O:18][CH3:19])[C:15]=1[O:16][CH3:17])[CH2:6][N:7]1[CH2:11][CH2:10][CH2:9][C:8]1=[O:12].C([Li])(CC)C.[F:25][C:26]([F:36])([F:35])[C:27]1[CH:34]=[CH:33][C:30]([CH2:31]Br)=[CH:29][CH:28]=1.O>O1CCCC1.C(OCC)(=O)C.CCCCCC>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:13]=[C:14]([O:18][CH3:19])[C:15]=1[O:16][CH3:17])[CH2:6][N:7]1[CH2:11][CH2:10][CH:9]([CH2:31][C:30]2[CH:29]=[CH:28][C:27]([C:26]([F:25])([F:35])[F:36])=[CH:34][CH:33]=2)[C:8]1=[O:12]

Participants

Conditions

Temperature: -78 °C

Procedure

Combine 1-(3,4,5-trimethoxybenzyl)-2-oxopyrrolidine (1.76 g, 6.63 mmol) and tetrahydrofuran (10 mL). Cool to −78° C. using a dry-ice/acetone bath. Add dropwise a solution of sec-butyllithium (5.10 mL, 1.3 M in hexane, 6.63 mmol). After 45 minutes, slowly add a solution of 4-(trifluoromethyl)benzyl bromide (1.58 g, 6.63 mmol) in tetrahydrofuran (5 mL). After 5 hours, add water (10 mL) and warm to ambient temperature. Separate the layers and extract the aqueous layer three times with ethyl acetate. Dry the combined organic layers over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 1/1 ethyl acetate/hexane to give the title compound: Rf=0.35 (silica gel, 1/1 ethyl acetate/hexane).

Workup

waitAfter 5 hours
temperaturewarm to ambient temperature
customSeparate the layers
extractionextract the aqueous layer three times with ethyl acetate
dry with materialDry the combined organic layers over Na2SO4
filtrationfilter
customevaporate in vacuo
customto give a residue

Sources & evidence

ORD record: ord-7656bc41e59e488bb8ca28b5fd34e8c2
Source dataset: uspto-grants-2001_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06211199B1

Reaction notes

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