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

HRID 2295683Notes

Reaction equation

HRID 2295683 reaction equation
C([NH:3][C:4]1[S:5][CH:6]=[C:7]([C:9](=[N:27][O:28][CH2:29][C:30]#[CH:31])[C:10]([NH:12][CH:13]2[C:25](=[O:26])[N:15]3[C:16]([C:22]([OH:24])=[O:23])=[C:17]([O:20][CH3:21])[CH2:18][S:19][C@H:14]23)=[O:11])[N:8]=1)=O.Cl>CO>[NH2:3][C:4]1[S:5][CH:6]=[C:7]([C:9](=[N:27][O:28][CH2:29][C:30]#[CH:31])[C:10]([NH:12][CH:13]2[C:25](=[O:26])[N:15]3[C:16]([C:22]([OH:24])=[O:23])=[C:17]([O:20][CH3:21])[CH2:18][S:19][C@H:14]23)=[O:11])[N:8]=1

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 1317125017-[2-(2-Formamidothiazol-4-yl)-2-propargyloxyiminoacetamido]-3-methoxy-3-cephem-4-carboxylic acid

Product 1

HCID 1317130237-[2-(2-Aminothiazol-4-yl)-2-propargyloxyiminoacetamido]-3-methoxy-3-cephem-4-carboxylic acidYield 29.6%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A mixture of 7-[2-(2-formamidothiazol-4-yl)-2-propargyloxyiminoacetamido]-3-methoxy-3-cephem-4-carboxylic acid (syn isomer, 0.9 g.), conc. hydrochloric acid (0.9 ml.) and methanol (13.4 ml.) was stirred at room temperature for 4 hours. After concentrating the resultant solution in vacuo at 35° C., the residue was dissolved in water and washed with ethyl acetate. The aqueous solution was adjusted to pH 7.0 with sodium bicarbonate and washed with ethyl acetate and diethyl ether. After removing the organic solvent by bubbling nitrogen gas, the solution was adjusted to pH 3.0 with 10% hydrochloric acid and stirred under ice cooling. The precipitate was collected by filtration, washed with water and dried to give 7-[2-(2-aminothiazol-4-yl)-2-propargyloxyiminoacetamido]-3-methoxy-3-cephem-4-carboxylic acid (syn isomer, 0.25 g.), whitish yellow powder.

Workup

  1. concentrationAfter concentrating the resultant solution in vacuo at 35° C.
  2. dissolutionthe residue was dissolved in water
  3. washwashed with ethyl acetate
  4. washwashed with ethyl acetate and diethyl ether
  5. customAfter removing the organic solvent
  6. customby bubbling nitrogen gas
  7. stirringstirred under ice cooling
  8. filtrationThe precipitate was collected by filtration
  9. washwashed with water
  10. customdried

Sources & evidence

ORD record
ord-01d05d852e804565a82956746d2694d4
Source dataset
uspto-grants-1984_01
Patent number
US04425341

Reaction notes

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