Ethanol → 5-[8-Methoxy-1-(4-carboxybenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl]thiazolidine-2,4-dione

HRID 504034Notes

Reaction equation

HRID 504034 reaction equation
[OH-].[Li+].C(O)C.[CH3:6][O:7][C:8]1[CH:9]=[CH:10][C:11]([CH2:30][CH:31]2[S:35][C:34](=[O:36])[NH:33][C:32]2=[O:37])=[C:12]2[C:17]=1[N:16]([CH2:18][C:19]1[CH:24]=[CH:23][C:22]([C:25]([O:27]C)=[O:26])=[CH:21][CH:20]=1)[C:15](=[O:29])[CH2:14][CH2:13]2>C1COCC1>[CH3:6][O:7][C:8]1[CH:9]=[CH:10][C:11]([CH2:30][CH:31]2[S:35][C:34](=[O:36])[NH:33][C:32]2=[O:37])=[C:12]2[C:17]=1[N:16]([CH2:18][C:19]1[CH:20]=[CH:21][C:22]([C:25]([OH:27])=[O:26])=[CH:23][CH:24]=1)[C:15](=[O:29])[CH2:14][CH2:13]2

Participants

5

Reactant 3

HCID 702EthanolHCID 3939Lithium HydroxideHCID 580267165-[8-Methoxy-1-(4-methoxycarbonylbenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl]thiazolidine-2,4-dione

Product 1

HCID 866139425-[8-Methoxy-1-(4-carboxybenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl]thiazolidine-2,4-dioneYield 97%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

35 ml of an aqueous 1 N-lithium hydroxide solution was added to a mixed ethanol (200 ml) and THF (200 ml) solution of 4.0 g of 5-[8-methoxy-1-(4-methoxycarbonylbenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl]thiazolidine-2,4-dione, followed by stirring at room temperature overnight. The solvent was distilled off under reduced pressure, hydrochloric acid was added to the residue, and the insoluble matter thus formed was collected by filtration. The collected insoluble matter was purified by silica gel column chromatography (n-hexane:ethyl acetate=1:1→1:3), and recrystallized from ethyl acetate, giving 3.75 g (97% yield) of 5-[8-methoxy-1-(4-carboxybenzyl)-2-oxo-1,2,3,4-tetrahydroquinolin-5-ylmethyl]thiazolidine-2,4-dione as a white powder.

Workup

  1. distillationThe solvent was distilled off under reduced pressure, hydrochloric acid
  2. additionwas added to the residue
  3. customthe insoluble matter thus formed
  4. filtrationwas collected by filtration
  5. customThe collected insoluble matter was purified by silica gel column chromatography (n-hexane:ethyl acetate=1:1→1:3)
  6. customrecrystallized from ethyl acetate

Sources & evidence

ORD record
ord-7d7ea7590fdf4b1a97f16c4927d790d8
Source dataset
uspto-grants-2010_08
Patent number
US07777038B2

Reaction notes

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