Water → HCID 12984523, compound

Temperature

-70 °C

To a reaction container equipped with a dropping funnel, 8 g of 2,5-dibromopyridine and 90 ml of diethyl ether were added. The obtained solution was cooled at −70° C. and then, 21.37 mL of butyl lithium (1.58 M/hexane solution) was added dropwise thereto. The obtained mixture was stirred for 1 hour and 30 minutes and then, a solution obtained by dissolving 4.32 mL of trimethylchlorosilane in 6.2 mL of diethyl ether was added dropwise thereto. The obtained mixture was stirred for 2 hours and 40 minutes and then, 60 mL of water was added dropwise thereto at 0° C. The obtained mixture was stirred at room temperature overnight and then, 30 mL of diethyl ether was added thereto. The obtained solution was extracted three times with 30 mL of diethyl ether. The obtained organic layers were mixed and dried with magnesium sulfate. After removing magnesium sulfate by filtration, the filtrate was concentrated to obtain a crude product. The crude product was purified with silica gel column chromatography to obtain 5.96 g of 2-bromo-5-trimethylsilylpyridine. Purity: 90% (area percentage value obtained by gas chromatography analysis).

1. customTo a reaction container equipped with a dropping funnel
2. customa solution obtained
3. additionwas added dropwise
4. stirringThe obtained mixture was stirred for 2 hours and 40 minutes
5. customat 0° C
6. stirringThe obtained mixture was stirred at room temperature overnight
7. extractionThe obtained solution was extracted three times with 30 mL of diethyl ether
8. additionThe obtained organic layers were mixed
9. dry with materialdried with magnesium sulfate
10. customAfter removing magnesium sulfate
11. filtrationby filtration
12. concentrationthe filtrate was concentrated
13. customto obtain a crude product
14. customThe crude product was purified with silica gel column chromatography

ORD record

ord-448ec44575d643489b384ba3de1c0cce

Source dataset

uspto-grants-2012_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08293905B2