Ethyl Acetate → 1-(3,4,5-Trimethoxybenzyl)-2-oxopyrrolidine

HRID 323259

Reaction equation

[NH:1]1[CH2:5][CH2:4][CH2:3][C:2]1=[O:6].C[Si]([N-][Si](C)(C)C)(C)C.[K+].S(O[CH2:22][C:23]1[CH:28]=[C:27]([O:29][CH3:30])[C:26]([O:31][CH3:32])=[C:25]([O:33][CH3:34])[CH:24]=1)(=O)(=O)C.C(OCC)(=O)C>O1CCCC1>[CH3:34][O:33][C:25]1[CH:24]=[C:23]([CH:28]=[C:27]([O:29][CH3:30])[C:26]=1[O:31][CH3:32])[CH2:22][N:1]1[CH2:5][CH2:4][CH2:3][C:2]1=[O:6]

Participants

Conditions

Temperature: -78 °C

Procedure

Combine 2-pyrrolidinone (2.85 g, 33.5 mmol) and tetrahydrofuran (70 mL). Cool to −78° C. using a dry-ice/acetone bath. Add a solution of potassium bis(trimethylsilyl)amide (67 mL, 0.5 M in toluene, 33.5 mol). After 45 minutes, add a solution of 3,4,5-trimethoxybenzyl mesylate (8.8 g, 32.02 mmol) in tetrahydrofuran (60 mL). After the addition of 3,4,5-trimethoxybenzyl mesylate is complete, heat to reflux. After 18 hours, cool the reaction mixture and partition between water and ethyl acetate. Separate the aqueous layer and extract 4 times with ethyl acetate. Dry the combined organic layers over Na2SO4, filter, and concentrate in vacuo to obtain a residue. Chromatograph the residue on silica gel eluting with ethyl acetate to give the title compound: Rf=0.35 (silica gel, ethyl acetate).

Workup

temperatureheat to reflux
waitAfter 18 hours
temperaturecool the reaction mixture
custompartition between water and ethyl acetate
customSeparate the aqueous layer
extractionextract 4 times with ethyl acetate
dry with materialDry the combined organic layers over Na2SO4
filtrationfilter
concentrationconcentrate in vacuo
customto obtain a residue

Sources & evidence

ORD record: ord-a3c903c1840e48eaab629b6bd9865ccc
Source dataset: uspto-grants-2001_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06211199B1

Linked notes

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