反应详情

温度

-78 °C

To a suspension of 1-benzenesulfonyl-5-fluoro-1H-pyrrolo[2,3-b]pyridine (10 g, 36.2 mmol) in dry tetrahydrofuran (400 mL) at −78° C. was added a n-butyllithium solution in n-hexane (2.5 M, 21.7 mL, 54.3 mmol) dropwise. The mixture was stirred at −78° C. for 30 min and then treated with 3-methyl-butyraldehyde (7 mL, 65.2 mmol) dropwise. The resulting mixture was stirred at −78° C. for 1 h and quenched with brine. The mixture was extracted with ethyl acetate (2×200 mL), washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. Purification by flash column chromatography (QingDao silica gel, 200-300 mesh, 20% ethyl acetate/hexanes) afforded 1-(1-benzenesulfonyl-5-fluoro-1H-pyrrolo[2,3-b]pyridin-2-yl)-3-methyl-butan-1-ol as a colorless oil (9.4 g, 71%): LC/MS m/e calcd for C20H22N2O4S [M+H]+ 363.43, observed 362.8.

1. stirringThe resulting mixture was stirred at −78° C. for 1 h
2. customquenched with brine
3. extractionThe mixture was extracted with ethyl acetate (2×200 mL)
4. washwashed with brine
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated in vacuo
7. customPurification by flash column chromatography (QingDao silica gel, 200-300 mesh, 20% ethyl acetate/hexanes)