Methanol → 5-[[4-[[(4E)-6-hydroxy-4-methoxyimino-2,5,7,8-tetramethyl-3H-chromen-2-yl]methoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione

HRID 1030367Notes

Reaction equation

HRID 1030367 reaction equation
[OH:1][C:2]1[C:3]([CH3:32])=[C:4]2[C:9](=[C:10]([CH3:13])[C:11]=1[CH3:12])[O:8][C:7]([CH2:15][O:16][C:17]1[CH:30]=[CH:29][C:20]([CH2:21][CH:22]3[S:26][C:25](=[O:27])[NH:24][C:23]3=[O:28])=[CH:19][CH:18]=1)([CH3:14])[CH2:6][C:5]2=O.Cl.[CH3:34][O:35][NH2:36].CO.C(=O)([O-])[O-].[K+].[K+]>C(OCC)(=O)C>[OH:1][C:2]1[C:3]([CH3:32])=[C:4]2[C:9](=[C:10]([CH3:13])[C:11]=1[CH3:12])[O:8][C:7]([CH2:15][O:16][C:17]1[CH:18]=[CH:19][C:20]([CH2:21][CH:22]3[S:26][C:25](=[O:27])[NH:24][C:23]3=[O:28])=[CH:29][CH:30]=1)([CH3:14])[CH2:6]/[C:5]/2=[N:36]\[O:35][CH3:34]

Participants

6

Reactant 4

HCID 887MethanolHCID 11430Potassium CarbonateHCID 521874O-Methylhydroxylamine hydrochlorideHCID 98252415-[4-(6-Hydroxy-2,5,7,8-tetramethyl-4-oxochroman-2-ylmethoxy)benzyl]thiazolidine-2,4-dione

Product 1

HCID 884915535-[[4-[[(4E)-6-hydroxy-4-methoxyimino-2,5,7,8-tetramethyl-3H-chromen-2-yl]methoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

A mixture of 1 g of 5-[4-(6-hydroxy-2,5,7,8-tetramethyl-4-oxochroman-2-ylmethoxy)benzyl]thiazolidine-2,4-dione (prepared as described in Example 22 of copending U.S. Ser. No. 644,996), 0.6 g of methoxyamine hydrochloride and 5 g of methanol was allowed to stand for 10 days at room temperature. At the end of this time, ethyl acetate and an aqueous solution of potassium carbonate were added. The organic layer was separated and dried over anhydrous sodium sulfate. The solvent was distilled off and the residue was purified by silica gel column chromatography eluted with a 3:1 by volume mixture of hexane and ethyl acetate, to give the title compound softening at 72°-76° C.

Workup

  1. customprepared
  2. customThe organic layer was separated
  3. dry with materialdried over anhydrous sodium sulfate
  4. distillationThe solvent was distilled off
  5. customthe residue was purified by silica gel column chromatography
  6. washeluted with a 3:1 by volume mixture of hexane and ethyl acetate

Sources & evidence

ORD record
ord-cee559df400c429993bdd2c3a45a8397
Source dataset
uspto-grants-1992_04
Patent number
US05104888

Reaction notes

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