反应详情

温度

-78 °C

To a cold (−78° C.) solution of thieno[2,3-b]pyridine (2.000 g, 14.79 mmol) in anhydrous THF (50 mL) was added n-butyllithium (10.17 mL, 16.27 mmol) dropwise. The reaction mixture was stirred for 60 minutes at −78° C. A solution of tributylchlorostannane (4.79 mL, 17.75 mmol) in anhydrous THF (10 mL) was added and the reaction mixture was stirred for 30 minutes at −78° C. The solution was allowed to warm to room temperature over a period of 2 to 3 hours. Saturated aqueous sodium bicarbonate was added. The aqueous phase was extracted with ether (3×200 mL). The organic layers were combined, dried over anhydrous sodium sulfate, filtered, and evaporated in vacuo. The crude product was purified by silica gel column chromatography, eluting with a gradient of 10-50% EtOAc and hexane over a period of 60 minutes. The desired fractions were collected and the solvent removed in vacuo to give the title compound (4.5 g, 72%) 1H NMR (500 MHz, DMSO-d6) δ ppm 0.87 (t, J=7.32 Hz, 9H), 1.13-1.20 (m, 6H), 1.32 (dq, J=14.64, 7.32 Hz, 6H), 1.52-1.64 (m, 6H), 7.34-7.42 (m, 1H), 7.51 (s, 1H), 8.25 (dd, J=7.81, 1.46 Hz, 1H), 8.50 (dd, J=4.39, 1.46 Hz, 1H).

1. stirringthe reaction mixture was stirred for 30 minutes at −78° C
2. temperatureto warm to room temperature over a period of 2 to 3 hours
3. extractionThe aqueous phase was extracted with ether (3×200 mL)
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. customevaporated in vacuo
7. customThe crude product was purified by silica gel column chromatography
8. washeluting with a gradient of 10-50% EtOAc and hexane over a period of 60 minutes
9. customThe desired fractions were collected
10. customthe solvent removed in vacuo