Phosphorus oxychloride → 7-[2-(2-Formamido-5-bromothiazol-4-yl)-2-methoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-ylthiomethyl)-3-cephem-4-carboxylic acid

HRID 256432Notes

Reaction equation

HRID 256432 reaction equation
[NH2:1][CH:2]1[C:19](=[O:20])[N:4]2[C:5]([C:16]([OH:18])=[O:17])=[C:6]([CH2:9][S:10][C:11]3[S:12][CH:13]=[N:14][N:15]=3)[CH2:7][S:8][C@H:3]12.C[Si](CC(N)=O)(C)C.P(Cl)(Cl)(Cl)=O.[CH:34]([NH:36][C:37]1[S:38][C:39]([Br:49])=[C:40]([C:42](=[N:46][O:47][CH3:48])[C:43](O)=[O:44])[N:41]=1)=[O:35]>C(OCC)(=O)C.CN(C)C=O>[CH:34]([NH:36][C:37]1[S:38][C:39]([Br:49])=[C:40]([C:42](=[N:46][O:47][CH3:48])[C:43]([NH:1][CH:2]2[C:19](=[O:20])[N:4]3[C:5]([C:16]([OH:18])=[O:17])=[C:6]([CH2:9][S:10][C:11]4[S:12][CH:13]=[N:14][N:15]=4)[CH2:7][S:8][C@H:3]23)=[O:44])[N:41]=1)=[O:35]

Participants

7

Reactant 4

HCID 24813Phosphorus oxychlorideHCID 357676Acetamide, 2-(trimethylsilyl)-HCID 128891877-Amino-3-(1,3,4-thiadiazol-2-ylthiomethyl)-3cephem-4-carboxylic acidHCID 538011022-(2-Formamido-5-bromothiazol-4-yl)-2-methoxyiminoacetic acid

Product 1

HCID 1317153387-[2-(2-Formamido-5-bromothiazol-4-yl)-2-methoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-ylthiomethyl)-3-cephem-4-carboxylic acidYield 59.6%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent2×

Procedure

A solution of 7-amino-3-(1,3,4-thiadiazol-2-ylthiomethyl)-3-cephem-4-carboxylic acid (syn isomer, 1.1 g.) and trimethylsilylacetamide (3.4 g.) in dry ethyl acetate (30 ml.) and a mixture of dimethylformamide (0.3 ml.), phosphoryl chloride (0.35 ml.), 2-(2-formamido-5-bromothiazol-4-yl)-2-methoxyiminoacetic acid (syn isomer, 1.0 g.) and dry ethyl acetate (30 ml.) were treated in a similar manner to that of Example 1-(1) to give 7-[2-(2-formamido-5-bromothiazol-4-yl)-2-methoxyiminoacetamido]-3-(1,3,4-thiadiazol-2-ylthiomethyl)-3-cephem-4-carboxylic acid (syn isomer, 1.2 g.).

Workup

  1. additionwere treated in a similar manner to that of Example 1-(1)

Sources & evidence

ORD record
ord-8b709a4d5a5547869888ecf39d0398b4
Source dataset
uspto-grants-1987_10
Patent number
US04703046

Reaction notes

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