Diisopropyl Ether → Sodium 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate

HRID 569398Notes

Reaction equation

HRID 569398 reaction equation
[NH2:1][C:2]1[S:3][CH:4]=[C:5]([C:7](=[N:25][O:26][CH3:27])[C:8]([NH:10][CH:11]2[C:23](=[O:24])[N:13]3[C:14]([C:20]([OH:22])=[O:21])=[C:15]([CH:18]=[CH2:19])[CH2:16][S:17][C@H:12]23)=[O:9])[N:6]=1.C(=O)(O)[O-].[Na+:32].[C:33]([O:39][CH2:40]I)(=[O:38])[C:34]([CH3:37])([CH3:36])[CH3:35].C(OC(C)C)(C)C>CN(C)C=O.O.C(OCC)(=O)C>[NH2:1][C:2]1[S:3][CH:4]=[C:5]([C:7](=[N:25][O:26][CH3:27])[C:8]([NH:10][CH:11]2[C:23](=[O:24])[N:13]3[C:14]([C:20]([O-:22])=[O:21])=[C:15]([CH:18]=[CH2:19])[CH2:16][S:17][C@H:12]23)=[O:9])[N:6]=1.[Na+:32].[NH2:1][C:2]1[S:3][CH:4]=[C:5]([C:7](=[N:25][O:26][CH3:27])[C:8]([NH:10][CH:11]2[C:23](=[O:24])[N:13]3[C:14]([C:20]([O:22][CH2:40][O:39][C:33](=[O:38])[C:34]([CH3:37])([CH3:36])[CH3:35])=[O:21])=[C:15]([CH:18]=[CH2:19])[CH2:16][S:17][C@H:12]23)=[O:9])[N:6]=1

Participants

9

Reactant 4

HCID 7914Diisopropyl EtherHCID 104401Iodomethyl pivalateHCID 516892Sodium BicarbonateHCID 1317131687-[2-(2-Aminothiazol-4-yl)-2-methoxyimino-acetamido]-3-vinyl-3-cephem-4-carboxylic acid

Product 2

HCID 131713178Sodium 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylateHCID 131713179Pivaloyloxymethyl 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6228DimethylformamideSolvent2×HCID 8857Ethyl AcetateSolvent

Procedure

Sodium 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (2.9 g), which was prepared from 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylic acid and sodium bicarbonate in substantially the same manner as that of Example 78-(1), was dissolved in N,N-dimethylformamide (30 ml), and thereto was added dropwise a solution of iodomethyl pivalate (1.62 g) in N,N-dimethylformamide (5 ml) under ice-cooling with stirring, and the stirring was continued at the same temperature for 10 minutes. To the reaction mixture were added ethyl acetate (200 ml) and water (150 ml), followed by separating out the organic layer, which was washed with a saturated aqueous solution of sodium bicarbonate and an aqueous solution of sodium chloride, and then dried over anhydrous magnesium sulfate. Removal of the solvent gave an oil, which was pulverized with diisopropyl ether to obtain pivaloyloxymethyl 7-[2-(2-aminothiazol-4-yl)-2-methoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer)(2.1 g).

Workup

  1. temperaturecooling
  2. customby separating out the organic layer, which
  3. washwas washed with a saturated aqueous solution of sodium bicarbonate
  4. dry with materialan aqueous solution of sodium chloride, and then dried over anhydrous magnesium sulfate
  5. customRemoval of the solvent
  6. customgave an oil, which

Sources & evidence

ORD record
ord-1224b9107d7e4029b82e5fabd92b6bcd
Source dataset
uspto-grants-1988_03
Patent number
US04731443

Reaction notes

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