Hydrochloric Acid → 7-[2-(2-Aminothiazol-4-yl)-2-carboxymethoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylic acid

HRID 1088169Notes

Reaction equation

HRID 1088169 reaction equation
C([O:14][C:15]([CH2:17][O:18][N:19]=[C:20]([C:51]1[N:52]=[C:53]([NH2:56])[S:54][CH:55]=1)[C:21]([NH:23][CH:24]1[C:49](=[O:50])[N:26]2[C:27]([C:33]([O:35]C(C3C=CC=CC=3)C3C=CC=CC=3)=[O:34])=[C:28]([CH:31]=[CH2:32])[CH2:29][S:30][C@H:25]12)=[O:22])=[O:16])(C1C=CC=CC=1)C1C=CC=CC=1.Cl.C(OC(C)C)(C)C>C(O)=O>[C:15]([CH2:17][O:18][N:19]=[C:20]([C:51]1[N:52]=[C:53]([NH2:56])[S:54][CH:55]=1)[C:21]([NH:23][CH:24]1[C:49](=[O:50])[N:26]2[C:27]([C:33]([OH:35])=[O:34])=[C:28]([CH:31]=[CH2:32])[CH2:29][S:30][C@H:25]12)=[O:22])([OH:16])=[O:14]

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 7914Diisopropyl EtherHCID 131713343Benzhydryl 7-[2-benzhydryloxycarbonylmethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-vinyl-3-cephem-4-carboxylate

Product 1

HCID 913233527-[2-(2-Aminothiazol-4-yl)-2-carboxymethoxyiminoacetamido]-3-vinyl-3-cephem-4-carboxylic acidYield 86.7%

Reagents, catalysts & solvents 1

HCID 284Formic AcidSolvent

Procedure

To a solution of benzhydryl 7-[2-benzhydryloxycarbonylmethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-vinyl-3-cephem-4-carboxylate (syn isomer) (3 g) in formic acid (12 ml) was added 35% hydrochloric acid (1 ml) at 0° C. After stirring at ambient temperature for an hour, the reaction mixture was poured into diisopropyl ether. The precipitates were collected by filtration, washed with diisopropyl ether and then dissolved in water (15 ml). The aqueous solution was adjusted to pH 3.5 with 5% aqueous sodium bicarbonate. The precipitates were collected by filtration and dried to give 7-[2-carboxymethoxyimino-2-(2-aminothiazol-4-yl)acetamido]-3-vinyl-3-cephem-4-carboxylic acid (syn isomer) (1.5 g).

Workup

  1. filtrationThe precipitates were collected by filtration
  2. washwashed with diisopropyl ether
  3. dissolutiondissolved in water (15 ml)
  4. filtrationThe precipitates were collected by filtration
  5. customdried

Sources & evidence

ORD record
ord-ecb0f99fa7fa4b6db441fab08bcd60b6
Source dataset
uspto-grants-1990_10
Patent number
US04960889

Reaction notes

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