Ethyl Acetate → 7beta-[2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetamido]-3-(1-methyl-1-piperazinio)methyl-3-cephem-4-carboxylate

HRID 5525Notes

Reaction equation

HRID 5525 reaction equation
FC(F)(F)C(O)=O.[NH2:8][C:9]1[S:13][N:12]=[C:11]([C:14](=[N:32][O:33][CH3:34])[C:15]([NH:17][C@@H:18]2[C:30](=[O:31])[N:20]3[C:21]([C:27]([OH:29])=[O:28])=[C:22]([CH2:25]Cl)[CH2:23][S:24][C@H:19]23)=[O:16])[N:10]=1.[CH3:35][N:36]1[CH2:41][CH2:40][N:39](C(OC(C)(C)C)=O)[CH2:38][CH2:37]1.C(OCC)(=O)C>CN(C)C=O>[NH2:8][C:9]1[S:13][N:12]=[C:11]([C:14](=[N:32][O:33][CH3:34])[C:15]([NH:17][C@@H:18]2[C:30](=[O:31])[N:20]3[C:21]([C:27]([O-:29])=[O:28])=[C:22]([CH2:25][N+:36]4([CH3:35])[CH2:41][CH2:40][NH:39][CH2:38][CH2:37]4)[CH2:23][S:24][C@H:19]23)=[O:16])[N:10]=1

Participants

5

Reactant 3

HCID 8857Ethyl AcetateHCID 114013941-Boc-4-methylpiperazineHCID 1317181337beta-[2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetamido]-3-chloromethyl-3-cephem-4-carboxylic acid trifluoroacetate

Product 1

HCID 1317181317beta-[2-(5-Amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetamido]-3-(1-methyl-1-piperazinio)methyl-3-cephem-4-carboxylate

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of 7β-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetamido]-3-chloromethyl-3-cephem-4-carboxylic acid trifluoroacetate (syn isomer) in N,N-dimethylformamide (150 ml) was added 1-methyl-4-tert-butoxycarbonylpiperazine (30 g). After being stirred at room temperature for 30 minutes, the mixture was added dropwise to ethyl acetate (1.5 l). The resulting precipitate was collected by filtration, washed with ethyl acetate and diisopropyl ether. To a solution of the above precipitate in a mixture of methylene chloride (6e ml) and anisole (20 ml) was added dropwise trifluoroacetic acid (40 ml) under ice-cooling. The reaction mixture was stirred at room temperature for 2 hours and added to diisopropyl ether (1.5 l) under stirring. The resultant precipitate was collected by filtration and dissolved in aqueous sodium bicarbonate, and the solution was adjusted to pH 4.0 with hydrochloric acid and subjected to column chromatography on "Diaion HP-20" (Trademark:prepared by Mitsubishi Chemical Industries) with 5% aqueous isopropyl alcohol as an eluent. The eluate was lyophilized to give 7β-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-methoxyiminoacetamido]-3-(1-methyl-1-piperazinio)methyl-3-cephem-4-carboxylate (syn isomer) (12.00 g).

Workup

  1. filtrationThe resulting precipitate was collected by filtration
  2. washwashed with ethyl acetate and diisopropyl ether
  3. additionTo a solution of the above precipitate in a mixture of methylene chloride (6e ml) and anisole (20 ml)
  4. additionwas added dropwise trifluoroacetic acid (40 ml) under ice-
  5. temperaturecooling
  6. stirringThe reaction mixture was stirred at room temperature for 2 hours
  7. additionadded to diisopropyl ether (1.5 l)
  8. stirringunder stirring
  9. filtrationThe resultant precipitate was collected by filtration
  10. dissolutiondissolved in aqueous sodium bicarbonate
  11. custom" (Trademark:prepared by Mitsubishi Chemical Industries) with 5% aqueous isopropyl alcohol as an eluent

Sources & evidence

ORD record
ord-6f6c5d046c9e4fcab21226b8290da43a
Source dataset
uspto-grants-1993_09
Patent number
US05244890

Reaction notes

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