反应详情

A solution of ethyl 2-(cyclopropanecarboxamido)-3-mercaptopropanoate (example 57, step a) (5 g) and tosic acid (0.875 g) in toluene (100 mL) was heated at reflux under Dean and Stark conditions overnight. The reaction was allowed to cool and the toluene solution was washed with saturated sodium hydrogen carbonate solution (3×100 mL) dried over sodium sulphate, filtered and evaporated. The resulting brown gum was redissolved in acetonitrile (100 mL). Manganese dioxide (40 g) was added and the mixture heated at reflux overnight. The reaction was filtered through Celite and the filter pad washed with MeCN (3×100 mL). The combined filtrate and washings were evaporated and the residue purified by silica gel chromatography eluting with 9:1 to 4:1 isohexane:ethyl acetate gradient. The fractions containing product were combined and evaporated to give the subtitled compound as a clear oil. Yield 0.15 g.

1. temperatureat reflux under Dean and Stark conditions overnight
2. temperatureto cool
3. washthe toluene solution was washed with saturated sodium hydrogen carbonate solution (3×100 mL)
4. dry with materialdried over sodium sulphate
5. filtrationfiltered
6. customevaporated
7. dissolutionThe resulting brown gum was redissolved in acetonitrile (100 mL)
8. additionManganese dioxide (40 g) was added
9. temperaturethe mixture heated
10. temperatureat reflux overnight
11. filtrationThe reaction was filtered through Celite
12. washthe filter pad washed with MeCN (3×100 mL)
13. customThe combined filtrate and washings were evaporated
14. customthe residue purified by silica gel chromatography
15. washeluting with 9:1 to 4:1 isohexane
16. additionThe fractions containing product
17. customevaporated