反应详情

To a suspension of [(Z and E)-2-(2-pyridyl)vinylthio]silver (2.26 g) in acetonitrile (140 ml) was added sodium iodide (8.18 g) under ice-cooling. The mixture was stirred at the same temperature for 30 minutes. To this mixture was added benzhydryl 7-formamido-3-mesyloxy-3-cephem-4-carboxylate (4 g) at once at the same temperature. The mixture was stirred under ice-cooling for 30 minutes. The insoluble material was filtered off. The filtrate was concentrated in vacuo to give a residue. The residue was dissolved in a mixture of ethyl acetate and a saturated aqueous solution of sodium chloride. The mixture was stirred for 1 hour. Sellaite was added to the mixture. The insoluble material was filtered off. The separated organic layer was washed with a saturated aqueous solution of sodium chloride, dried over magnesium sulfate and concentrated in vacuo to give a solid. The solid was subjected to column chromatography on silica gel (175 g) and eluted with a mixture of chloroform and ethyl acetate (4:1 v/v). The fractions containing the material having a larger Rf value in thin layer chromatography were combined and concentrated in vacuo to give benzhydryl 7-formamido-3-[(Z)-2-(2-pyridyl)vinylthio]-3-cephem-4-carboxylate (2.15 g) as a solid.

1. temperaturecooling
2. stirringThe mixture was stirred under ice-
3. temperaturecooling for 30 minutes
4. filtrationThe insoluble material was filtered off
5. concentrationThe filtrate was concentrated in vacuo
6. customto give a residue
7. stirringThe mixture was stirred for 1 hour
8. filtrationThe insoluble material was filtered off
9. washThe separated organic layer was washed with a saturated aqueous solution of sodium chloride
10. dry with materialdried over magnesium sulfate
11. concentrationconcentrated in vacuo
12. customto give a solid
13. washeluted with a mixture of chloroform and ethyl acetate (4:1 v/v)
14. additionThe fractions containing the material
15. concentrationconcentrated in vacuo