반응 #9296

반응 방정식

sodium hydroxide

2-bromoethyl methyl ether

hydrochloric acid ethyl acetate

tert-butyl N-[7-(2,4-dichlorophenyl)-2-ethylpyrazolo[1,5-a]pyridin-3-yl]carbamate

sodium hydride

→

title compound

N-[7-(2,4-Dichlorophenyl)-2-ethylpyrazolo[1,5-a]pyridin-3-yl]-N-(2-methoxyethyl)amine

용매

N,N-dimethylformamide

ethyl acetate

Water

ethyl acetate

반응 조건

후처리

1. 1
   workup.ADDITIONwas added
2. 2
   온도while cooling on ice
3. 3
   세척the extract was washed with brine
4. 4
   건조The obtained organic layer was dried over anhydrous magnesium sulfate
5. 5
   여과filtered
6. 6
   농축the solvent was concentrated under reduced pressure
7. 7
   기타to obtain a crude product
8. 8
   workup.STIRRINGthe mixture was stirred at room temperature for 1 hour
9. 9
   온도while cooling on ice
10. 10
    추출extraction
11. 11
    세척the organic layer was washed with water and brine
12. 12
    건조After drying over anhydrous magnesium sulfate and filtration
13. 13
    농축the solvent was concentrated under reduced pressure
14. 14
    기타the residue was purified by silica gel column chromatography

실험 절차

After dissolving tert-butyl N-[7-(2,4-dichlorophenyl)-2-ethylpyrazolo[1,5-a]pyridin-3-yl]carbamate (57 mg) in N,N-dimethylformamide (2 mL), sodium hydride (60%, 7.3 mg) was added while cooling on ice, and then 2-bromoethyl methyl ether (0.015 mL) was added and the mixture was stirred for 1 hour. Water was added to the reaction mixture, extraction was performed with ethyl acetate and the extract was washed with brine. The obtained organic layer was dried over anhydrous magnesium sulfate and filtered, and then the solvent was concentrated under reduced pressure to obtain a crude product. This was dissolved in ethyl acetate (1 mL) without purification, a 4 N hydrochloric acid/ethyl acetate solution (2 mL) was added, and the mixture was stirred at room temperature for 1 hour. The reaction mixture was neutralized with 5 N aqueous sodium hydroxide while cooling on ice, and then extraction was performed with ethyl acetate and the organic layer was washed with water and brine. After drying over anhydrous magnesium sulfate and filtration, the solvent was concentrated under reduced pressure, the residue was purified by silica gel column chromatography, and the title compound (46 mg) was obtained from the n-hexane:ethyl acetate (5:1) fraction as a yellow oil.

출처