Phosphorus oxychloride → p-Nitrobenzyl 7-{2(2-formamido-4-thiazolyl)-2-methoxyiminoacetamido}-3-chloro-3-cephem-4-carboxylate

HRID 848310Notes

Reaction equation

HRID 848310 reaction equation
C[N+](C)=CCl.[Cl-].P(Cl)(Cl)(Cl)=O.[CH:12]([NH:14][C:15]1[S:16][CH:17]=[C:18]([C:20](=[N:24][O:25][CH3:26])[C:21]([OH:23])=O)[N:19]=1)=[O:13].[NH2:27][CH:28]1[C:49](=[O:50])[N:30]2[C:31]([C:36]([O:38][CH2:39][C:40]3[CH:45]=[CH:44][C:43]([N+:46]([O-:48])=[O:47])=[CH:42][CH:41]=3)=[O:37])=[C:32]([Cl:35])[CH2:33][S:34][C@H:29]12.C[Si](CC(N)=O)(C)C>C(OCC)(=O)C.O.CN(C)C=O>[CH:12]([NH:14][C:15]1[S:16][CH:17]=[C:18]([C:20](=[N:24][O:25][CH3:26])[C:21]([NH:27][CH:28]2[C:49](=[O:50])[N:30]3[C:31]([C:36]([O:38][CH2:39][C:40]4[CH:41]=[CH:42][C:43]([N+:46]([O-:48])=[O:47])=[CH:44][CH:45]=4)=[O:37])=[C:32]([Cl:35])[CH2:33][S:34][C@H:29]23)=[O:23])[N:19]=1)=[O:13]

Participants

9

Reactant 5

HCID 24813Phosphorus oxychlorideHCID 77311Chloro-N,N-dimethylformiminium chlorideHCID 357676Acetamide, 2-(trimethylsilyl)-HCID 27245112-(2-Formylamino-1,3-Thiazol-4-Yl)-2-(Methoxyimino)Acetic AcidHCID 676435564-Nitrobenzyl 7-amino-3-chloro-3-cephem-4-carboxylate

Product 1

HCID 131712431p-Nitrobenzyl 7-{2(2-formamido-4-thiazolyl)-2-methoxyiminoacetamido}-3-chloro-3-cephem-4-carboxylateYield 80.8%

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent2×

Procedure

Vilsmeier reagent prepared from dimethylformamide (0.22 g.) and phosphorus oxychloride (0.46 g.) was suspended in dry ethyl acetate (20 ml.). 2-(2-Formamido-4-thiazolyl)-2-methoxyiminoacetic acid (anti isomer, 0.62 g.) was added to the suspension underice-cooling with stirring, and the mixture was stirred at the same temperature for 30 minutes to prepare the activated acid solution. The solution was added all at once to a solution of p-nitrobenzyl 7-amino-3-chloro-3-cephem-4-carboxylate (1 g.) and trimethylsilylacetamide (2.58 g.) in ethyl acetate (20 ml.) at -20° C. with stirring, and the mixed solution was stirred at -10° to -20° C. for 1.5 hours. To the resultant solution was added water (20 ml.), and the solution was stirred at -20° C. After separating the ethyl acetate layer, the aqueous layer was extracted with ethyl acetate (20 ml.). The ethyl acetate layer and the extract were combined together, washed with 10 % hydrochloric acid (20 ml.) twice, water (20 ml.) once, a 5% aqueous solution of sodium bicarbonate (20 ml.) three times, and an aqueous solution of sodium chloride (20 ml.) once in turn, dried, and then concentrated under reduced pressure. The residue was washed with diethyl ether (50 ml.) to give p-nitrobenzyl 7-{2(2-formamido-4-thiazolyl)-2-methoxyiminoacetamido}-3-chloro-3-cephem-4-carboxylate (anti isomer, 1.27 g.), m.p. 135° to 145° C. (dec.).

Workup

  1. temperatureunderice-cooling
  2. stirringthe mixture was stirred at the same temperature for 30 minutes
  3. customto prepare the activated acid solution
  4. stirringwith stirring
  5. stirringthe mixed solution was stirred at -10° to -20° C. for 1.5 hours
  6. stirringthe solution was stirred at -20° C
  7. customAfter separating the ethyl acetate layer
  8. extractionthe aqueous layer was extracted with ethyl acetate (20 ml.)
  9. washwashed with 10 % hydrochloric acid (20 ml.) twice
  10. dry with materialwater (20 ml.) once, a 5% aqueous solution of sodium bicarbonate (20 ml.) three times, and an aqueous solution of sodium chloride (20 ml.) once in turn, dried
  11. concentrationconcentrated under reduced pressure
  12. washThe residue was washed with diethyl ether (50 ml.)

Sources & evidence

ORD record
ord-4e6df57dba024916a0b521183995f86b
Source dataset
uspto-grants-1981_10
Patent number
US04294960

Reaction notes

Loading…