Pyridine → [(4E)-4-acetyloxyimino-2-[[4-[(2,4-dioxo-1,3-thiazolidin-5-yl)methyl]phenoxy]methyl]-2,5,7,8-tetramethyl-3H-chromen-6-yl] acetate

HRID 1030363Notes

Reaction equation

HRID 1030363 reaction equation
[OH:1][C:2]1[C:3]([CH3:33])=[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=[N:31]\[OH:32].[C:34](OC(=O)C)(=[O:36])[CH3:35].N1[CH:46]=[CH:45]C=CC=1.C(=O)([O-])[O-:48].[K+].[K+]>C(OCC)(=O)C>[C:34]([O:1][C:2]1[C:3]([CH3:33])=[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:31]\[O:32][C:45](=[O:48])[CH3:46])(=[O:36])[CH3:35]

Participants

6

Reactant 4

HCID 1049PyridineHCID 7918Acetic AnhydrideHCID 11430Potassium CarbonateHCID 883935005-[[4-[[(4E)-6-hydroxy-4-hydroxyimino-2,5,7,8-tetramethyl-3H-chromen-2-yl]methoxy]phenyl]methyl]-1,3-thiazolidine-2,4-dione

Product 1

HCID 19822205[(4E)-4-acetyloxyimino-2-[[4-[(2,4-dioxo-1,3-thiazolidin-5-yl)methyl]phenoxy]methyl]-2,5,7,8-tetramethyl-3H-chromen-6-yl] acetate

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

A mixture of 1 g of 5-{4-[6-hydroxy-4-(E)-hydroxyimino-2,5,7,8tetramethylchroman-2-ylmethoxy ]benzyl}thiazolidine-2,4-dione (prepared as described in Example 13), 1.3 g of acetic anhydride and 10 ml of pyridine was allowed to stand for 8 days at room temperature, after which it was heated for 8 hours at 60°-80° C. An aqueous solution of potassium carbonate and ethyl acetate were then added to the reaction mixture. 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 4:1 by volume mixture of hexane and ethyl acetate, to give the title compound, softening at 93°-97° C.

Workup

  1. temperatureafter which it was heated for 8 hours at 60°-80° C
  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 4:1 by volume mixture of hexane and ethyl acetate

Sources & evidence

ORD record
ord-bdcb02b237e94afabf36defd6c96ce6a
Source dataset
uspto-grants-1992_04
Patent number
US05104888

Reaction notes

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