反应详情

A solution of 3-chloropropanesulphonyl chloride (20.0 g) in dichloromethane (200 cm3) was added dropwise over 1.5 hours to a stirred solution of 4-(2-aminoethyl)pyridine (13.8 g) in dichloromethane (200 cm3) and triethylamine (15 cm3) at 0° C. The ice bath was removed and the mixture was stirred for 16 hours. Saturated aqueous sodium carbonate (100 cm3) was then added and the organic phase was dried (MgSO4) and evaporated in vacuo to yield an oil which was suspended in abs. ethanol (500 cm3) and heated under reflux with potassium hydroxide (6.3 g) for 0.5 hours. The mixture was cooled and filtered and the filtrate was evaporated in vacuo to yield an oil which was taken into warm ethyl acetate (100 cm3), charcoal was added and the mixture was filtered. The filtrate was passed through a "Florisil" column (Trade Mark, Hopkin and Williams) and eluted further with ethyl acetate to obtain a colourless oil. Crystallisation from ethyl acetate gave 2-[2-(4-pyridyl)ethyl]isothiazolidine-1,1-dioxide as colourless needles, m.p. 70° C. (15.0 g).

1. customThe ice bath was removed
2. additionSaturated aqueous sodium carbonate (100 cm3) was then added
3. dry with materialthe organic phase was dried (MgSO4)
4. customevaporated in vacuo
5. customto yield an oil which
6. temperatureThe mixture was cooled
7. filtrationfiltered
8. customthe filtrate was evaporated in vacuo
9. customto yield an oil which
10. additionwas added
11. filtrationthe mixture was filtered
12. washeluted further with ethyl acetate
13. customto obtain a colourless oil
14. customCrystallisation from ethyl acetate