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Hydrochloric Acid → 7-[2-(2-Amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylic acid

HRID 364531
Notes
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Reaction equation

HRID 364531 reaction equation
[NH2:1][C:2]1[S:3][CH:4]=[C:5]([C:7](=[N:33][O:34][CH3:35])[C:8]([NH:10][CH:11]2[C:31](=[O:32])[N:13]3[C:14]([C:18]([O:20]CC4C=CC([N+]([O-])=O)=CC=4)=[O:19])=[CH:15][CH2:16][S:17][C@H:12]23)=[O:9])[N:6]=1.[OH-].[K+].Cl>C(O)C.O>[NH2:1][C:2]1[S:3][CH:4]=[C:5]([C:7](=[N:33][O:34][CH3:35])[C:8]([NH:10][CH:11]2[C:31](=[O:32])[N:13]3[C:14]([C:18]([OH:20])=[O:19])=[CH:15][CH2:16][S:17][C@H:12]23)=[O:9])[N:6]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 14797Potassium HydroxideHCID 1317124504-Nitrobenzyl 7-[2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate

Product 1

HCID 1317124447-[2-(2-Amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylic acidYield 39.9%

Reagents, catalysts & solvents 2

HCID 702
Ethanol
Solvent
HCID 962WaterSolvent

Conditions

Temperature
5 °C

Procedure

p-Nitrobenzyl 7-[2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate (syn-isomer: 7.8 g.) was suspended in a mixture of ethanol (60 ml.) and water (60 ml.) 1N Aqueous solution of potassium hydroxide (45 ml.) was added dropwise to the stirred suspension under ice-cooling over 10 minutes and stirred at 5° C. for 15 minutes. The resultant solution was adjusted to pH 7.0 with conc. hydrochloric acid, washed with ethyl acetate and the concentrated under reduced pressure to half of its initial volume. The concentrated solution was adjusted to pH 5.0 and subjected to column chromatography on macroporous, non-ionic adsorption resin "Diaion HP-20" (Trade mark; manufactured by Mitsubishi Chemical Industries Ltd.; 80 ml.), and eluted with 5% aqueous solution of isopropyl alcohol. The fractions containing the object compound were collected and adjusted to pH 3.2 with 10% hydrochloric acid. The precipitating crystals were collected by filtration, and dried to give 7-[2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylic acid (syn-isomer: 2.3 g.)

Workup

  1. additionwas added dropwise to the stirred suspension under ice-
  2. temperaturecooling over 10 minutes
  3. washwashed with ethyl acetate
  4. concentrationthe concentrated under reduced pressure to half of its initial volume
  5. washeluted with 5% aqueous solution of isopropyl alcohol
  6. additionThe fractions containing the object compound
  7. customwere collected
  8. filtrationThe precipitating crystals were collected by filtration
  9. customdried

Sources & evidence

ORD record
ord-26d531abf30b45a29ce662adc4b84389
Source dataset
uspto-grants-1986_08
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US04604456

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes