Trifluoroacetic acid → (6R,7R)-7-[[(2Z)-2-(2-amino-5-chloro-1,3-thiazol-4-yl)-2-hydroxyiminoacetyl]amino]-8-oxo-3-(1H-pyrazol-4-ylmethylsulfanyl)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

HRID 1274973Notes

Reaction equation

HRID 1274973 reaction equation
FC(F)(F)C(O)=O.[NH2:8][C:9]1[S:10][C:11]([Cl:57])=[C:12](/[C:14](=[N:50]/[O:51]C2CCC=C2)/[C:15]([NH:17][C@@H:18]2[C:48](=[O:49])[N:20]3[C:21]([C:32]([O:34]C(C4C=CC=CC=4)C4C=CC=CC=4)=[O:33])=[C:22]([S:25][CH2:26][C:27]4[CH:28]=[N:29][NH:30][CH:31]=4)[CH2:23][S:24][C@H:19]23)=[O:16])[N:13]=1.C1(OC)C=CC=CC=1.C(OC(C)C)(C)C>ClCCl>[NH2:8][C:9]1[S:10][C:11]([Cl:57])=[C:12](/[C:14](=[N:50]/[OH:51])/[C:15]([NH:17][C@@H:18]2[C:48](=[O:49])[N:20]3[C:21]([C:32]([OH:34])=[O:33])=[C:22]([S:25][CH2:26][C:27]4[CH:31]=[N:30][NH:29][CH:28]=4)[CH2:23][S:24][C@H:19]23)=[O:16])[N:13]=1

Participants

6

Reactant 4

HCID 6422Trifluoroacetic acidHCID 7519AnisoleHCID 7914Diisopropyl EtherHCID 88198442benzhydryl (6R,7R)-7-[[(2Z)-2-(2-amino-5-chloro-1,3-thiazol-4-yl)-2-cyclopent-2-en-1-yloxyiminoacetyl]amino]-8-oxo-3-(1H-pyrazol-4-ylmethylsulfanyl)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

Product 1

HCID 9871187(6R,7R)-7-[[(2Z)-2-(2-amino-5-chloro-1,3-thiazol-4-yl)-2-hydroxyiminoacetyl]amino]-8-oxo-3-(1H-pyrazol-4-ylmethylsulfanyl)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acidYield 35.5%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

Under nitrogen atmosphere, trifluoroacetic acid (4.0 ml) was added dropwise to a solution of diphenylmethyl 7β-[2-(2-amino-5-chlorothiazol-4-yl)-2-(Z)-(2-cyclopenten-1-yloxyimino)acetamido]-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylate (1.71 g) in the mixture of dichloromethane (6.0 ml) and anisole (2.0 ml) at 0° C. Stirring was continued for 2 hours at the same temperature, the mixture was poured into isopropyl ether (200 ml). The resulting precipitate was collected by filtration, and then dissolved in the mixture of ethyl acetate and pH 6.86 buffer. The organic layer was removed, and the aqueous layer was adjusted pH 3.0 with 1N hydrochloric acid, concentrated in vacuo, then chlomatographed on a HP-20 column (eluent: water-methanol) to afford 7β-[2-(2-amino-5-chlorothiazol-4-yl)-2-(Z)-(hydroxyimino)acetamido]-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylic acid (418.3 mg).

Workup

  1. filtrationThe resulting precipitate was collected by filtration
  2. dissolutiondissolved in the mixture of ethyl acetate and pH 6.86 buffer
  3. customThe organic layer was removed
  4. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-3cfb3f25f0c64876901a46cd2ab2b909
Source dataset
uspto-grants-2000_12
Patent number
US06159961

Reaction notes

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