Acetic Anhydride → 7-(2-Methoxyimino-3,3-diethoxy-4-bromobutyramido)-3-cephem-4-carboxylic acid

HRID 1702085Notes

Reaction equation

HRID 1702085 reaction equation
[CH3:1][O:2][N:3]=[C:4]([C:21]([O:27][CH2:28][CH3:29])([O:24][CH2:25][CH3:26])[CH2:22][Br:23])[C:5]([NH:7][CH:8]1[C:19](=[O:20])[N:10]2[CH:11]([C:16]([OH:18])=[O:17])[CH:12](O)[CH2:13][S:14][C@H:9]12)=[O:6].C(OC(=O)C)(=O)C.C([O-])(=O)C.[Na+]>C(C(C)=O)C(C)C>[CH3:1][O:2][N:3]=[C:4]([C:21]([O:27][CH2:28][CH3:29])([O:24][CH2:25][CH3:26])[CH2:22][Br:23])[C:5]([NH:7][CH:8]1[C:19](=[O:20])[N:10]2[C:11]([C:16]([OH:18])=[O:17])=[CH:12][CH2:13][S:14][C@H:9]12)=[O:6]

Participants

5

Reactant 3

HCID 7918Acetic AnhydrideHCID 517045Sodium AcetateHCID 867380937-(2-Methoxyimino-3,3-diethoxy-4-bromobutyramido)-3-hydroxycepham-4-carboxylic acid

Product 1

HCID 1317125347-(2-Methoxyimino-3,3-diethoxy-4-bromobutyramido)-3-cephem-4-carboxylic acidYield 69.7%

Reagents, catalysts & solvents 1

HCID 7909Methyl Isobutyl KetoneSolvent

Procedure

7-(2-Methoxyimino-3,3-diethoxy-4-bromobutyramido)-3-hydroxycepham-4-carboxylic acid (syn isomer, 5 g), acetic anhydride (4.55 ml), sodium acetate (1.45 g), and methyl isobutyl ketone (50 ml) were treated in a similar manner to that of Example 43 to give 7-(2-methoxyimino-3,3-diethoxy-4-bromobutyramido)-3-cephem-4-carboxylic acid (syn isomer, 3.36 g).

Sources & evidence

ORD record
ord-9e5397e85ff14acd896d9f01f59d1ee2
Source dataset
uspto-grants-1983_04
Patent number
US04379922

Reaction notes

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