Water → 7beta-Phenoxyacetamido-3-hydroxy-3-cephem-4-carboxylic acid p-nitrobenzyl ester

HRID 465168Notes

Reaction equation

HRID 465168 reaction equation
[N+:1]([C:4]1[CH:48]=[CH:47][C:7]([CH2:8][O:9][C:10](=[O:46])/[C:11](/[N:19]2[CH:22]([S:23]S(C3C=CC(C)=CC=3)(=O)=O)[CH:21]([NH:34][C:35](=[O:44])[CH2:36][O:37][C:38]3[CH:43]=[CH:42][CH:41]=[CH:40][CH:39]=3)[C:20]2=[O:45])=[C:12](\N2CCCC2)/[CH3:13])=[CH:6][CH:5]=1)([O-:3])=[O:2].C1(C)C=CC=CC=1.C(OCC)(=[O:58])C.C1(C)C=CC(S(O)(=O)=O)=CC=1.O>C(#N)C.C1C=CC=CC=1>[N+:1]([C:4]1[CH:48]=[CH:47][C:7]([CH2:8][O:9][C:10]([C:11]2[N:19]3[C:20](=[O:45])[C@@H:21]([NH:34][C:35](=[O:44])[CH2:36][O:37][C:38]4[CH:39]=[CH:40][CH:41]=[CH:42][CH:43]=4)[C@H:22]3[S:23][CH2:13][C:12]=2[OH:58])=[O:46])=[CH:6][CH:5]=1)([O-:3])=[O:2]

Participants

7

Reactant 4

HCID 962WaterHCID 6101p-Toluenesulfonic acidHCID 12784133HCID 12784133, compoundHCID 21584019Toluene ethylacetate

Product 1

HCID 547167947beta-Phenoxyacetamido-3-hydroxy-3-cephem-4-carboxylic acid p-nitrobenzyl ester

Reagents, catalysts & solvents 2

HCID 241BenzeneSolventHCID 6342AcetonitrileSolvent

Procedure

A solution of 160 mg (0.23 mmol) of a mixture consisting of 2-[4-(p-toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-(1-pyrrolidyl)-crotonic acid p-nitrobenzyl ester and the corresponding isocrotonic acid ester in 3 ml of dry acetonitrile is heated under nitrogen for about 4 hours at 80° C. until no further starting material can be detected by thin layer chromatography (silica gel; toluene/ethyl acetate, 1:1). The heating bath is removed, p-toluenesulphonic acid (about 0.23 mmol) and 0.2 ml of water are added to the reaction mixture containing the 7β-phenoxyacetamido-3-pyrrolidino-cephem-4-carboxylic acid p-nitrobenzyl ester and the mixture is stirred for a further 2 hours at room temperature. The reaction mixture is diluted with benzene, washed with water, dried over sodium sulphate and evaporated in vacuo. The residue is triturated at 0° C. with diethyl ether and gives the pale yellow 7β-phenoxyacetamido-3-hydroxy-3-cephem-4-carboxylic acid p-nitrobenzyl ester.

Workup

  1. customThe heating bath is removed
  2. washwashed with water
  3. dry with materialdried over sodium sulphate
  4. customevaporated in vacuo
  5. customThe residue is triturated at 0° C. with diethyl ether

Sources & evidence

ORD record
ord-e4c8d76d64454a4ba1078185eab18b38
Source dataset
uspto-grants-1985_10
Patent number
US04550162

Reaction notes

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