反应详情

温度

-78 °C

Compound (1) was dissolved in anhydrous THF (20 ml) in a nitrogen-filled flask. The solution was cooled down to −78° C. LDA was prepared from the reaction of diisopropylamine (0.5 g, 5.1 mmol, 3 eq.) and n-BuLi (3.12 ml, 5.1 mmol, 3 eq.) (1.6 M hexane solution) in anhydrous THF (2 ml), which was added to the above solution dropwise. After stirring for 1 h, trimethylstannyl chloride (3.8 ml, 3.8 mmol, 2.3 eq.) (1 M THF solution) was added and reacted for 1 h. The reaction was quenched by addition of water and the organic layer was extracted with ether, washed with water and dried over anhydrous magnesium sulfate. After the solvent was removed under reduced pressure, the residue was purified by recrystallization from ethanol, giving the title compound as a needle-shaped purple crystal.

1. additionfilled flask
2. additionwas added to the above solution dropwise
3. customreacted for 1 h
4. customThe reaction was quenched by addition of water
5. extractionthe organic layer was extracted with ether
6. washwashed with water
7. dry with materialdried over anhydrous magnesium sulfate
8. customAfter the solvent was removed under reduced pressure
9. customthe residue was purified by recrystallization from ethanol