p-Nitrobenzyl alpha-[4-mercapto-3-phenoxyacetamido-2-oxoazetidin-1-yl]-alpha-(2-bromo-1-hydroxyethylidene)acetate → p-Nitrobenzyl 3-hyroxy-7-phenoxyacetamido-3-cephem-4-carboxylate

HRID 1679226Notes

Reaction equation

HRID 1679226 reaction equation
[SH:1][CH:2]1[N:5]([C:6](=[C:20]([OH:23])[CH2:21]Br)[C:7]([O:9][CH2:10][C:11]2[CH:16]=[CH:15][C:14]([N+:17]([O-:19])=[O:18])=[CH:13][CH:12]=2)=[O:8])[C:4](=[O:24])[CH:3]1[NH:25][C:26](=[O:35])[CH2:27][O:28][C:29]1[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=1>C1C=CC=CC=1>[OH:23][C:20]1[CH2:21][S:1][C@@H:2]2[CH:3]([NH:25][C:26](=[O:35])[CH2:27][O:28][C:29]3[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=3)[C:4](=[O:24])[N:5]2[C:6]=1[C:7]([O:9][CH2:10][C:11]1[CH:16]=[CH:15][C:14]([N+:17]([O-:19])=[O:18])=[CH:13][CH:12]=1)=[O:8]

Participants

3

Reactant 1

HCID 86735550p-Nitrobenzyl alpha-[4-mercapto-3-phenoxyacetamido-2-oxoazetidin-1-yl]-alpha-(2-bromo-1-hydroxyethylidene)acetate

Product 1

HCID 67616247p-Nitrobenzyl 3-hyroxy-7-phenoxyacetamido-3-cephem-4-carboxylateYield 66.3%

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

To a solution of p-nitrobenzyl α-[4-mercapto-3-phenoxyacetamido-2-oxoazetidin-1-yl]-α-(2-bromo-1-hydroxyethylidene)acetate (106 mg) in benzene (5ml) is added silica gel F-254 (500 mg) distributed by E. Merck Ag., and the mixture is shaken at room temperature for 1 hour. The insoluble material is removed by filtration, and washed several times with chloroform. The filtrate and washed solution are combined and evaporated under reduced pressure to give p-nitrobenzyl 3-hydroxy-7-phenoxyacetamido-3-cephem-4-carboxylate (60 mg). Yield: 66.3%. m.p. 95.5°-99.5° C IR: νmaxCHC13 3400, 1785, 1685, 1605. NMR: δCDC13 2.03s2H, 4.60s2H, 5.07+5.37ABq(4)2H, 5.37d(4)1H, 5.68dd(9;4)1H, 6.83-8.32m9H.

Workup

  1. customThe insoluble material is removed by filtration
  2. washwashed several times with chloroform
  3. washThe filtrate and washed solution
  4. customevaporated under reduced pressure

Sources & evidence

ORD record
ord-27059023c71c41cbb664c2a6c26859c5
Source dataset
uspto-grants-1978_03
Patent number
US04079181

Reaction notes

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