Reaktion #552352

Reaktionsgleichung

2-[4-(p-toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-methylenebutyric acid p-nitrobenzyl ester

sodium bisulphite

→

2 -[4-(p-toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-hydroxycrotonic acid p-nitrobenzyl ester

Lösungsmittel

ethyl acetate

methyl acetate

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeozonised at -70° C.
2. 2
   Temperaturthe latter is warmed to 0°-5° C
3. 3
   Sonstigethe aqueous phase is separated off
4. 4
   Waschenthe organic phase is washed with water
5. 5
   Trocknendried over magnesium sulphate
6. 6
   workup.DISSOLUTIONThe crude product is dissolved in 3 ml of methylene chloride
7. 7
   workup.ADDITION15 ml of toluene are added
8. 8
   FiltrationThe precipitate is filtered off
9. 9
   Sonstigethe filtrate is evaporated in vacuo
10. 10
    SonstigeThe residue is recrystallised from methanol

Vorschrift

(di) The crude 2-[4-(p-toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-methylenebutyric acid p-nitrobenzyl ester, obtained according to Example 1.(cvii), is dissolved in 20 ml of methyl acetate and ozonised at -70° C. until no further starting material is present, according to a thin layer chromatogram. A stream of nitrogen is then passed through the solution and the latter is warmed to 0°-5° C. A solution of 300 mg of sodium bisulphite in 5 ml of water is added and the mixture is stirred for about 5 minutes until no further ozonide can be detected with potassium iodide/starch paper. The mixture is diluted with ethyl acetate, the aqueous phase is separated off, and the organic phase is washed with water, dried over magnesium sulphate and freed from solvent in vacuo. The crude product is dissolved in 3 ml of methylene chloride and 15 ml of toluene are added. The precipitate is filtered off and the filtrate is evaporated in vacuo. The residue is recrystallised from methanol and gives 2 -[4-(p-toluenesulphonylthio)-3-phenoxyacetamido-2-oxoazetidin-1-yl]-3-hydroxycrotonic acid p-nitrobenzyl ester of melting point 159°-160° C.

Quelle