反应详情

温度

0 °C

To a suspension of 60% NaH (1.02 g) in THF (50 mL) was added tert-butyl 4-(acetyloxy)-3-oxobutanoate (5.00 g) under ice-water cooling and the mixture was stirred at 0° C. for 0.5 hour. To this added ethyl 3-iodopropanoate (5.54 g) and the mixture was stirred at 50° C. for 8 hours. The mixture was partitioned between AcOEt and water. The organic layer was separated, washed with brine, dried over MgSO4, and evaporated in vacuo. The residue was purified by silica gel column chromatography eluting with a mixture of hexane and AcOEt (20:1-3:1) to give 1-tert-butyl 5-ethyl 2-[(acetyloxy)acetyl]pentanedioate as yellow oil (4.27 g).

1. customThe mixture was partitioned between AcOEt and water
2. customThe organic layer was separated
3. washwashed with brine
4. dry with materialdried over MgSO4
5. customevaporated in vacuo
6. customThe residue was purified by silica gel column chromatography
7. washeluting with a mixture of hexane and AcOEt (20:1-3:1)