反应详情

To an ice-cooled suspension of sodium hydride (800 mg, 20 mmol; 60% in mineral oil) in THF (15 ml), a solution of Compound 22 (1.2 g, 2.1 mmol) in THF (20 ml) was gradually added; this was followed by stirring for 20 minutes. A solution of Compound 20 (1.7 g, 4.3 mmol) in THF (12 ml) was added thereto, and this was followed by stirring for 20 minutes. After the ice bath was removed, stirring was further conducted at room temperature for 2 hours. Water was carefully added to stop the reaction, and this was followed by concentration under reduced pressure. Extraction from methylene chloride was conducted, and the combined organic phases were washed with saturated brine and dried with anhydrous sodium sulfate. After filtration and concentration under reduced pressure, the residue obtained was purified by silica gel column chromatography (Yamazen YFLC Gel, eluent (n-hexane:ethyl acetate 2:1-1:1)) to yield Compound 23 (light-yellow oil 1.56 g, 84%).

1. stirringby stirring for 20 minutes
2. customAfter the ice bath was removed
3. stirringstirring
4. waitwas further conducted at room temperature for 2 hours
5. additionWater was carefully added
6. customthe reaction
7. concentrationthis was followed by concentration under reduced pressure
8. extractionExtraction from methylene chloride
9. washthe combined organic phases were washed with saturated brine
10. dry with materialdried with anhydrous sodium sulfate
11. filtrationAfter filtration and concentration under reduced pressure
12. customthe residue obtained
13. customwas purified by silica gel column chromatography (Yamazen YFLC Gel, eluent (n-hexane:ethyl acetate 2:1-1:1))