Trifluoroacetic acid → 7-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-hydroxyiminoacetamido]-3-[(Z)-2-(3-pyridyl)vinylthio]-3-cephem-4-carboxylic acid

HRID 704270Notes

Reaction equation

HRID 704270 reaction equation
[NH2:1][C:2]1[S:6][N:5]=[C:4]([C:7](=[N:45][O:46]C2CCC=C2)[C:8]([NH:10][CH:11]2[C:43](=[O:44])[N:13]3[C:14]([C:27]([O:29]C(C4C=CC=CC=4)C4C=CC=CC=4)=[O:28])=[C:15]([S:18]/[CH:19]=[CH:20]\[C:21]4[CH:22]=[N:23][CH:24]=[CH:25][CH:26]=4)[CH2:16][S:17][C@H:12]23)=[O:9])[N:3]=1.FC(F)(F)C(O)=O.C(OC(C)C)(C)C>C1(OC)C=CC=CC=1>[NH2:1][C:2]1[S:6][N:5]=[C:4]([C:7](=[N:45][OH:46])[C:8]([NH:10][CH:11]2[C:43](=[O:44])[N:13]3[C:14]([C:27]([OH:29])=[O:28])=[C:15]([S:18]/[CH:19]=[CH:20]\[C:21]4[CH:22]=[N:23][CH:24]=[CH:25][CH:26]=4)[CH2:16][S:17][C@H:12]23)=[O:9])[N:3]=1

Participants

5

Reactant 3

HCID 6422Trifluoroacetic acidHCID 7914Diisopropyl EtherHCID 131716155benzhydryl 7-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(2-cyclopenten-1-yl) oxyiminoacetamido]-3-[(Z)-2-(3-pyridyl)vinylthio]-3-cephem-4-carboxylate

Product 1

HCID 1372254437-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-hydroxyiminoacetamido]-3-[(Z)-2-(3-pyridyl)vinylthio]-3-cephem-4-carboxylic acidYield 53.7%

Reagents, catalysts & solvents 1

HCID 7519AnisoleSolvent

Procedure

To a suspension of benzhydryl 7-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(2-cyclopenten-1-yl)oxyiminoacetamido]-3-[(Z)-2-(3-pyridyl)vinylthio ]-3-cephem-4-carboxylate (syn isomer)(1.06 g) in anisole (2 ml) was added trifluoroacetic acid (4 ml) under ice-cooling and the mixture was stirred for 35 minutes at the same temperature. The mixture was poured into diisopropyl ether (250 ml). The precipitate was collected, washed with diisopropyl ether and dried over phosphorus pentoxide. The precipitate was dissolved in a mixture of tetrahydrofuran (50 ml), sodium bicarbonate (242 mg), water (40 ml) and ethyl acetate (50 ml). The aqueous layer was separated and adjusted to pH 2 with 1N hydrochloric acid. The resultant precipitate was collected, washed with cold water and dried over phosphorus pentoxide to give 7-[2-(5-amino-1,2,4-thiadiazol-3-yl)-2-hydroxyiminoacetamido]-3-[(Z)-2-(3-pyridyl)vinylthio]-3-cephem-4-carboxylic acid (syn isomer) (390 mg).

Workup

  1. temperaturecooling
  2. customThe precipitate was collected
  3. washwashed with diisopropyl ether
  4. dry with materialdried over phosphorus pentoxide
  5. dissolutionThe precipitate was dissolved in a mixture of tetrahydrofuran (50 ml), sodium bicarbonate (242 mg), water (40 ml) and ethyl acetate (50 ml)
  6. customThe aqueous layer was separated
  7. customThe resultant precipitate was collected
  8. washwashed with cold water
  9. dry with materialdried over phosphorus pentoxide

Sources & evidence

ORD record
ord-34643d5560a44284be448a0bbd790d52
Source dataset
uspto-grants-1991_01
Patent number
US04985555

Reaction notes

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