反应详情

A solution of HCl (4M in 1,4-dioxane, 20 mL) was added to a solution of ethyl 2-butyramido-3-mercaptopropanoate (example 56, step a) (3 g) in ethanol (20 mL) and the resulting mixture stirred overnight. The solvent was evaporated and the residue azeotroped twice with toluene. The residue was redissolved in acetonitrile (50 mL), manganese dioxide (11.9 g) was added and the mixture heated at reflux overnight. The reaction was filtered through a pad of Celite. The filter pad was washed with MeCN (3×100 mL). The combined filtrate and washings were evaporated and the residue was purified by silica gel chromatography eluting with 9:1 isohexane:ethyl acetate. The product containing fractions were combined and evaporated to give the subtitled compound as a clear oil. Yield 0.24 g.

1. customThe solvent was evaporated
2. customthe residue azeotroped twice with toluene
3. dissolutionThe residue was redissolved in acetonitrile (50 mL)
4. additionmanganese dioxide (11.9 g) was added
5. temperaturethe mixture heated
6. temperatureat reflux overnight
7. filtrationThe reaction was filtered through a pad of Celite
8. washThe filter pad was washed with MeCN (3×100 mL)
9. customThe combined filtrate and washings were evaporated
10. customthe residue was purified by silica gel chromatography
11. washeluting with 9:1 isohexane
12. additionThe product containing fractions
13. customevaporated