反応 #49198

反応方程式

sucrose

ketoester

4-Oxo-pyrrolidine-1,3-dicarboxylic acid 1-benzyl ester 3-ethyl ester

sucrose

→

alcohol

収率 41.4%

4-Hydroxy-pyrrolidine-1,3-dicarboxylic acid 1-benzyl ester 3-ethyl ester

収率 41.4%

溶媒

water

反応条件

後処理

1. 1
   workup.ADDITIONThe content of the flask was then poured into a flask
2. 2
   workup.DISTILLATIONdistilled water
3. 3
   workup.ADDITIONwas added
4. 4
   workup.WAITAfter 48 h
5. 5
   ろ過the suspension was filtered through a pad of Celite
6. 6
   洗浄The pad was washed with water
7. 7
   抽出the aqueous layer was extracted with ethyl acetate (3×250 mL)
8. 8
   乾燥The combined organic layer was dried over anhydrous sodium sulfate
9. 9
   ろ過filtered
10. 10
    濃縮concentrated under reduced pressure

実験手順

To a solution of sucrose (3 g) in distilled water (40 mL) was added Baker's yeast (2 g). The suspension was heated at 32° C. for 1 h. The content of the flask was then poured into a flask containing ketoester 71 (2.9 g, 9.88 mmol, dissolved in 4 mL of methanol). Stirring was continued at 32° C. for 24 h after which additional sucrose (3 g) in warm (40° C.) distilled water was added. After 48 h, the suspension was filtered through a pad of Celite. The pad was washed with water and the aqueous layer was extracted with ethyl acetate (3×250 mL). The combined organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was subjected to flash chromatography (30% EtOAc/Hexane) to afford alcohol 73 (1.2 g, 41%).

出典