反应详情

To a solution of 5-bromo-indole (3.30 g, 11.73 mmol) in dry DMF (15 mL) cooled with an ice bath was added NaH (55% suspension in mineral oil, 1.02 g, 23.46 mmol), followed by methyl iodide (2.50 g, 17.60 mmol) after which the reaction mixture was allowed to warm to room temperature. After 6 h the reaction mixture was poured into ice-water; 1N HCl was added to adjust the pH to about 4, and the solution was extracted with ethyl acetate. The ethyl acetate extract was washed with water and brine, then dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was filtered through silica gel (ethyl acetate:hexane; 1:4). The product, 5-bromo-1-methyl-1H-indole, was subjected to further reaction without additional purification. To a solution of 5-bromo-1-methyl-1H-indole in Et2O (20 mL) cooled to 0° C. a 2.0 M solution of oxalyl chloride in THF (17.0 mL, 34.0 mmol) was added dropwise. The reaction was then stirred for 0.5 h at 0° C. and allowed to warm to room temperature and stirred overnight. It was then cooled to −60° C. and a 21% solution of NaOEt in EtOH (13.50 mL, 45.70 mmol) was added, after which the reaction mixture was allowed to warm to room temperature. The reaction was quenched by the addition of water and diluted with ethyl acetate. The organic layer was separated, dried over anhydrous Na2SO4 and concentrated. The residue was purified by column chromatography (ethyl acetate:hexane; 1:3) to give a product (2.92 g, 86%).

1. extractionthe solution was extracted with ethyl acetate
2. extractionThe ethyl acetate extract
3. washwas washed with water and brine
4. dry with materialdried over anhydrous Na2SO4
5. concentrationconcentrated in vacuo
6. filtrationThe residue was filtered through silica gel (ethyl acetate:hexane; 1:4)
7. customThe product, 5-bromo-1-methyl-1H-indole, was subjected to further reaction without additional purification
8. additionwas added dropwise
9. temperatureto warm to room temperature
10. stirringstirred overnight
11. temperatureIt was then cooled to −60° C.
12. temperatureto warm to room temperature
13. customThe reaction was quenched by the addition of water
14. additiondiluted with ethyl acetate
15. customThe organic layer was separated
16. dry with materialdried over anhydrous Na2SO4
17. concentrationconcentrated
18. customThe residue was purified by column chromatography (ethyl acetate:hexane; 1:3)