Thionyl Chloride → 2-[(3S,4R)-4-acetylthio-3-methoxy-2-oxoazetidin-1-yl]-2-chloroacetic acid p-nitrobenzyl ester

HRID 2309084Notes

Reaction equation

HRID 2309084 reaction equation
[N+:1]([C:4]1[CH:35]=[CH:34][C:7]([CH2:8][O:9][C:10](=[O:33])[CH:11]([N:13]2[C@H:16]([S:17][C:18](=[O:20])[CH3:19])[C@@H:15]([O:21][C:22](=O)COC3C=CC=CC=3)[C:14]2=[O:32])O)=[CH:6][CH:5]=1)([O-:3])=[O:2].S(Cl)([Cl:38])=O>O1CCOCC1>[N+:1]([C:4]1[CH:35]=[CH:34][C:7]([CH2:8][O:9][C:10](=[O:33])[CH:11]([N:13]2[C@H:16]([S:17][C:18](=[O:20])[CH3:19])[C@@H:15]([O:21][CH3:22])[C:14]2=[O:32])[Cl:38])=[CH:6][CH:5]=1)([O-:3])=[O:2]

Participants

4

Reactant 2

HCID 24386Thionyl ChlorideHCID 566249532-[(3S,4R)-4-acetylthio-3-phenoxyacetoxy-2-oxoazetidin-1-yl]-2-hydroxyacetic acid p-nitrobenzyl ester

Product 1

HCID 566132492-[(3S,4R)-4-acetylthio-3-methoxy-2-oxoazetidin-1-yl]-2-chloroacetic acid p-nitrobenzyl ester

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent3×

Procedure

A suspension of 2 g of poly-Hunig base in 8 ml of dioxan is stirred at room temperature for 30 minutes, a solution of 962 mg of 2-[(3S,4R)-4-acetylthio-3-phenoxyacetoxy-2-oxoazetidin-1-yl]-2-hydroxyacetic acid p-nitrobenzyl ester in 10 ml of dioxan is added, then a solution of 0.38 ml of thionyl chloride in 8 ml of dioxan is added slowly. The mixture is stirred for 2 hours at room temperature, the poly-H/e,uml/u/ nig base is filtered off and the filtrate is concentrated by evaporation in vacuo. The residue is purified by chromatography over silica gel with toluene/ethyl acetate (1:1) and yields the 2-[(3S,4R)-4-acetylthio-3-methoxy-2-oxoazetidin-1-yl]-2-chloroacetic acid p-nitrobenzyl ester in crude form.

Workup

  1. stirringThe mixture is stirred for 2 hours at room temperature
  2. filtrationthe poly-H/e,uml/u/ nig base is filtered off
  3. concentrationthe filtrate is concentrated by evaporation in vacuo
  4. customThe residue is purified by chromatography over silica gel with toluene/ethyl acetate (1:1)

Sources & evidence

ORD record
ord-b99ef80f68fe4ba7a11cd2f506b3d762
Source dataset
uspto-grants-1987_09
Patent number
US04692442

Reaction notes

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