Hydrochloric Acid → 1-(3,4,5-Trimethoxybenzyl)-3-(phenylmethyl)-3-(2-hydroxyethyl)-2-oxopyrrolidine

HRID 323262Notes

Reaction equation

[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:30]=[C:31]([O:35][CH3:36])[C:32]=1[O:33][CH3:34])[CH2:6][N:7]1[CH2:11][CH2:10][C:9]([CH2:22][C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)([CH2:12][CH2:13][O:14][Si](C(C)(C)C)(C)C)[C:8]1=[O:29].O1CCCC1.[F-].C([N+](CCCC)(CCCC)CCCC)CCC.Cl>C(OCC)(=O)C.CCCCCC>[CH3:36][O:35][C:31]1[CH:30]=[C:5]([CH:4]=[C:3]([O:2][CH3:1])[C:32]=1[O:33][CH3:34])[CH2:6][N:7]1[CH2:11][CH2:10][C:9]([CH2:22][C:23]2[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=2)([CH2:12][CH2:13][OH:14])[C:8]1=[O:29]

Participants

Conditions

Temperature: 0 °C

Procedure

Combine 1-(3,4,5-trimethoxybenzyl)-3-(phenylmethyl)-3-(2-(t-butyldimethylsilyloxy)ethyl)-2-oxopyrrolidine (1.0 g, 1.95 mmol) and tetrahydrofuran (5 mL). Cool to 0° C. using a ice bath. Add a solution of tetrabutylammonium fluoride (3.90 mL, 1 M in THF, 3.90 mmol). After the addition is complete, warm to ambient temperature. After 1.5 hours, add aqueous 1 M hydrochloric acid solution (20 mL). Extract three 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 1/1 ethyl acetate/hexane to give the title compound: Rf=0.27 (silica gel, 1/1 ethyl acetate/hexane).

Workup

additionAfter the addition
temperaturewarm to ambient temperature
extractionExtract three 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-c8721eb2bb0f4b058c7a0746d73cacdf
Source dataset: uspto-grants-2001_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06211199B1

Reaction notes

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