Réaction #54376

Équation de réaction

toluene ethyl acetate

2-[4-(benzoxazol-2-yldithio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-methylene-butyric acid diphenylmethyl ester

ozone

O2 O3

→

2-[4-(Benzoxazol-2-yldithio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-hydroxy-crotonic acid diphenylmethyl ester

Solvants

ethyl acetate

Conditions de réaction

Traitement

1. 1
   ConcentrationThe solution is concentrated by evaporation to about 50 ml in vacuo
2. 2
   workup.ADDITIONmixed with 5 ml of dimethyl sulphide
3. 3
   Autreno longer gives
4. 4
   Autrea reaction
5. 5
   ConcentrationThe mixture is concentrated by evaporation in vacuo
6. 6
   workup.DISSOLUTIONthe residue is dissolved in 150 ml of benzene
7. 7
   Lavagethe solution is washed with water
8. 8
   SéchageThe organic phase is dried over sodium sulphate
9. 9
   Concentrationconcentrated by evaporation
10. 10
    AutreThe residue is chromatographed on 150 g of acid-washed silica gel

Mode opératoire

(aix) Approximately one equivalent of ozone (in the form of an O2 /O3 mixture) is passed into a solution, cooled to -70° C., of 3.35 g of 2-[4-(benzoxazol-2-yldithio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-methylene-butyric acid diphenylmethyl ester in 125 ml of ethyl acetate, until starting material is no longer detectable by thin layer chromatography (silica gel; toluene/ethyl acetate, 3:1). The solution is concentrated by evaporation to about 50 ml in vacuo, mixed with 5 ml of dimethyl sulphide and stirred until the potassium iodide/starch test no longer gives a reaction. The mixture is concentrated by evaporation in vacuo, the residue is dissolved in 150 ml of benzene and the solution is washed with water. The organic phase is dried over sodium sulphate and concentrated by evaporation. The residue is chromatographed on 150 g of acid-washed silica gel, using toluene/ethyl acetate, 4:1. 2-[4-(Benzoxazol-2-yldithio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-hydroxy-crotonic acid diphenylmethyl ester is obtained in the form of a white foam; IR spectrum (methylene chloride): characteristic bands at 5.60, 5.90 and 6.0 μ.

Source