Pyridine → 3-Methoxy-7beta-phenylacetylamino-3-cephem-4-carboxylic acid diphenylmethyl ester

HRID 597217Notes

Reaction equation

HRID 597217 reaction equation
N1C=CC=CC=1.[C:7]1([CH2:13][C:14](Cl)=[O:15])[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[C:17]1([CH:23]([O:30][C:31]([C:33]2[N:38]3[C:39](=[O:42])[C@@H:40]([NH2:41])[C@H:37]3[S:36][CH2:35][C:34]=2[O:43][CH3:44])=[O:32])[C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1>CCl>[C:17]1([CH:23]([O:30][C:31]([C:33]2[N:38]3[C:39](=[O:42])[C@@H:40]([NH:41][C:14](=[O:15])[CH2:13][C:7]4[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=4)[C@H:37]3[S:36][CH2:35][C:34]=2[O:43][CH3:44])=[O:32])[C:24]2[CH:25]=[CH:26][CH:27]=[CH:28][CH:29]=2)[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1

Participants

5

Reactant 3

HCID 1049PyridineHCID 7679Phenylacetyl chlorideHCID 441511537beta-Amino-3-methoxy-3-cephem-4-carboxylic acid diphenylmethyl ester

Product 1

HCID 128054463-Methoxy-7beta-phenylacetylamino-3-cephem-4-carboxylic acid diphenylmethyl ester

Reagents, catalysts & solvents 1

HCID 6327Methyl ChlorideSolvent

Procedure

1 ml of pyridine and 0.5 ml of phenylacetic acid chloride are added at 0° C, under a nitrogen atmosphere, to a suspension of 0.250 g of 7β-amino-3-methoxy-3-cephem-4-carboxylic acid diphenylmethyl ester in 25 ml of methyl chloride and the mixture is stirred for 30 minutes at this temperature. The reaction mixture is evaporated under reduced pressure; the residue is stirred for 10 minutes with 20 ml of a 1:1 mixture of dioxane and water and diluted with methylene chloride. The aqueous phase is separated off and extracted with methylene chloride. The combined organic phases are washed with a saturated aqueous sodium bicarbonate solution and a saturated aqueous sodium chloride solution, dried over sodium sulphate and evaporated under reduced pressure. The crude product is purified by means of preparative thin layer chromatography using, as the solvent, a 1:1 mixture of toluene and ethyl acetate. The zone visible under ultraviolet light of λ = 254 mμ (Rf~0.35) is eluted with a 4:1 mixture of acetone and methanol and gives 3-methoxy-7β-(α-phenylacetylamino)-3-cephem-4-carboxylic acid diphenylmethyl ester which is identical with the product obtainable by the process of Example 9.

Workup

  1. customThe reaction mixture is evaporated under reduced pressure
  2. stirringthe residue is stirred for 10 minutes with 20 ml of a 1:1 mixture of dioxane and water
  3. additiondiluted with methylene chloride
  4. customThe aqueous phase is separated off
  5. extractionextracted with methylene chloride
  6. washThe combined organic phases are washed with a saturated aqueous sodium bicarbonate solution
  7. dry with materiala saturated aqueous sodium chloride solution, dried over sodium sulphate
  8. customevaporated under reduced pressure
  9. customThe crude product is purified by means of preparative thin layer chromatography
  10. additiona 1:1 mixture of toluene and ethyl acetate
  11. washThe zone visible under ultraviolet light of λ = 254 mμ (Rf~0.35) is eluted with a 4:1 mixture of acetone and methanol

Sources & evidence

ORD record
ord-57bc4eb5654540538edf3a2fd165a51f
Source dataset
uspto-grants-1977_03
Patent number
US04013650

Reaction notes

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