Phosphorus oxychloride → 7-[2-Methoxyimino-3,3-dimethoxy-4-bromobutyramido)-3-hydroxycepham-4-carboxylic acid

HRID 1154829Notes

Reaction equation

HRID 1154829 reaction equation
[NH2:1][CH:2]1[C:13](=[O:14])[N:4]2[CH:5]([C:10]([OH:12])=[O:11])[CH:6]([OH:9])[CH2:7][S:8][C@H:3]12.C[Si](CC(N)=O)(C)C.[CH3:23][O:24][N:25]=[C:26]([C:30]([O:35][CH3:36])([O:33][CH3:34])[CH2:31][Br:32])[C:27](O)=[O:28].P(Cl)(Cl)(Cl)=O>C(Cl)Cl.CN(C)C=O>[CH3:23][O:24][N:25]=[C:26]([C:30]([O:35][CH3:36])([O:33][CH3:34])[CH2:31][Br:32])[C:27]([NH:1][CH:2]1[C:13](=[O:14])[N:4]2[CH:5]([C:10]([OH:12])=[O:11])[CH:6]([OH:9])[CH2:7][S:8][C@H:3]12)=[O:28]

Participants

7

Reactant 4

HCID 24813Phosphorus oxychlorideHCID 357676Acetamide, 2-(trimethylsilyl)-HCID 13072520(6R)-7-amino-3-hydroxy-8-oxo-5-thia-1-azabicyclo[4.2.0]octane-2-carboxylic acidHCID 539961982-Methoxyimino-3,3-dimethoxy-4-bromobutyric acid

Product 1

HCID 867380927-[2-Methoxyimino-3,3-dimethoxy-4-bromobutyramido)-3-hydroxycepham-4-carboxylic acidYield 79.8%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Procedure

7-Amino-3-hydroxycepham-4-carboxylic acid (2.18 g, purity 84.8%), trimethylsilylacetamide (10.5 g.), 2-methoxyimino-3,3-dimethoxy-4-bromobutyric acid (syn isomer, 3.24 g.), N,N-dimethylformamide (1.1 ml), phosphorus oxychloride (1.36 ml) and methylene chloride (50 ml.) were treated in a similar manner to that of Example 25 (1) to give 7-[2-methoxyimino-3,3-dimethoxy-4-bromobutyramido]-3-hydroxycepham-4-carboxylic acid (syn isomer, 3.75 g.).

Sources & evidence

ORD record
ord-c7b5d05c70ed416db38d626657f04e1a
Source dataset
uspto-grants-1981_11
Patent number
US04298529

Reaction notes

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