Acetic Acid → Benzhydryl (6R,7R)-8-oxo-7-(2-phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

HRID 648461Notes

Reaction equation

HRID 648461 reaction equation
[C:1]1([CH2:7][C:8]([NH:10][C@@H:11]2[C:21](=[O:22])[N:13]3[C:14]([C:18]([OH:20])=[O:19])=[CH:15][CH2:16][S:17][C@H:12]23)=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[C:23]1([C:29]([C:32]2[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=2)=[N+]=[N-])[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.C(O)(=O)C>CO.O1CCOCC1>[C:23]1([CH:29]([O:19][C:18]([C:14]2[N:13]3[C:21](=[O:22])[C@@H:11]([NH:10][C:8](=[O:9])[CH2:7][C:1]4[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=4)[C@H:12]3[S:17][CH2:16][CH:15]=2)=[O:20])[C:32]2[CH:33]=[CH:34][CH:35]=[CH:36][CH:37]=2)[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1

Participants

6

Reactant 3

HCID 176Acetic AcidHCID 612301,1'-(Diazomethylene)bis(benzene)HCID 13193156Ceftizoxime Impurity 46

Product 1

HCID 11237070Benzhydryl (6R,7R)-8-oxo-7-(2-phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 312751,4-DioxaneSolvent

Procedure

A solution of 1.275 g of 7β-phenylacetylamino-ceph-3-em-4-carboxylic acid in 5 ml of methanol and 20 ml of dioxane is treated with an excess of diphenyldiazomethane and allowed to stand at room temperature. The red-coloured reaction mixture is treated with a small amount of acetic acid and then evaporated to dryness under reduced pressure. The oily yellowish residue is taken up in a small amount of methylene chloride, the solution is treated with diethyl ether at an elevated temperature. The colourless precipitate (felt-like needles) is filtered off, washed with diethyl ether, then with pentane and dried to yield the 7β-phenylacetylamino-ceph-3-em-4-carboxylic acid diphenylmethylester of the formula ##STR28## m.p. 163.5°-164.5°; [α]D20 =+30°±1° (c=0.968 in dioxane); thin-layer chromatogram (silica gel): Rf=0.55 (system: toluene/acetone 4:1), Rf=0.35 (system: toluene/acetone 9:1) and Rf=0.40 (system: toluene/ethyl acetate 4:1); ultraviolet absorption spectrum: λmax =258 mμ (ε=6100) and λmin =240 mμ (ε=5250) (in methylene chloride) and λmax =259 mμ (ε=6050) and λmin =239 mμ (ε=4950); (95% ethanol) infrared absorption spectrum: characteristic bands at 2.90μ, 5.57μ, 5.76μ, 5.91μ, 6.09μ, 6.66μ, 7.13μ, 8.12μ, 8.63μ, 9.07μ, 10.43μ and 12.22μ (in methylene chloride) and at 3.01μ, 5.60μ, 5.82μ, 6.04μ, 6.08μ (shoulder), 6.51μ and 7.13μ (in mineral oil).

Workup

  1. customto stand at room temperature
  2. customevaporated to dryness under reduced pressure
  3. additionthe solution is treated with diethyl ether at an elevated temperature
  4. filtrationThe colourless precipitate (felt-like needles) is filtered off
  5. washwashed with diethyl ether
  6. dry with materialwith pentane and dried

Sources & evidence

ORD record
ord-f737c0b9ba3145b097325c6a5a916ab1
Source dataset
uspto-grants-1988_04
Patent number
US04735937

Reaction notes

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