Dimethyl Sulfate → 2-[4-(p-Toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-methoxy-isocrotonic acid diphenylmethyl ester

HRID 1155438Notes

Reaction equation

HRID 1155438 reaction equation
[CH3:1]OS(OC)(=O)=O.C(=O)(O)[O-].[K+].[C:13]1([CH:19]([O:26][C:27](=[O:59])/[C:28](/[N:32]2[CH:35]([S:36][S:37]([C:40]3[CH:45]=[CH:44][C:43]([CH3:46])=[CH:42][CH:41]=3)(=[O:39])=[O:38])[CH:34]([NH:47][C:48](=[O:57])[CH2:49][O:50][C:51]3[CH:56]=[CH:55][CH:54]=[CH:53][CH:52]=3)[C:33]2=[O:58])=[C:29](\[OH:31])/[CH3:30])[C:20]2[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>C1(C)C=CC=CC=1>[C:13]1([CH:19]([O:26][C:27](=[O:59])/[C:28](/[N:32]2[CH:35]([S:36][S:37]([C:40]3[CH:41]=[CH:42][C:43]([CH3:46])=[CH:44][CH:45]=3)(=[O:38])=[O:39])[CH:34]([NH:47][C:48](=[O:57])[CH2:49][O:50][C:51]3[CH:52]=[CH:53][CH:54]=[CH:55][CH:56]=3)[C:33]2=[O:58])=[C:29](/[O:31][CH3:1])\[CH3:30])[C:20]2[CH:21]=[CH:22][CH:23]=[CH:24][CH:25]=2)[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=1

Participants

5

Reactant 3

HCID 6497Dimethyl SulfateHCID 516893Potassium BicarbonateHCID 70454173HCID 70454173, compound

Product 1

HCID 128054242-[4-(p-Toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-methoxy-isocrotonic acid diphenylmethyl ester

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent2×

Procedure

(avi) 3.78 g (30 mmols) of dimethylsulphate and 30 ml of 20 percent strength aqueous potassium bicarbonate solution are added to a suspension of 6.72 g (10 mmols) of 2-[4-(p-toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-hydroxy-crotonic acid diphenylmethyl ester (crystalline) and 0.36 g (1 mmol) of tetera-n-butylammonium iodide in 100 ml of toluene and the mixture is stirred vigorously for 4 hours at room temperature. During the first 15 minutes, the solid dissolves. The mixture is diluted with toluene and washed with saturated aqueous sodium chloride solution. After drying the organic phase with sodium sulphate, and concentrating it, crystallisation from ethyl acetate/diethyl ether gives 2-[4-(p-toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-methoxy-isocrotonic acid diphenylmethyl ester.

Workup

  1. dissolutionDuring the first 15 minutes, the solid dissolves
  2. washwashed with saturated aqueous sodium chloride solution
  3. dry with materialAfter drying the organic phase with sodium sulphate
  4. concentrationconcentrating
  5. customit, crystallisation from ethyl acetate/diethyl ether

Sources & evidence

ORD record
ord-6969e1a8b7bb439194a80f5b94d53406
Source dataset
uspto-grants-1981_11
Patent number
US04301278

Reaction notes

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