반응 #582498

반응 방정식

Sodium acetylide

p-methoxyphenyl-thiophene-2-yl-ketone

DMSO

→

1-(4methoxyphenyl)-1-(thiophene-2-yl)prop-2-yn-1-ol

반응 조건

후처리

1. 1
   온도cooling
2. 2
   기타while bubbling acetylene gas
3. 3
   workup.ADDITIONAfter addition
4. 4
   workup.STIRRINGthe reaction mixture was stirred at room temperature for 2 hours
5. 5
   workup.ADDITIONpoured
6. 6
   기타onto crushed ice
7. 7
   추출After extraction with methylene chloride (20 ml
8. 8
   건조2×10 ml), the mixture was dried over anhydrous sodium sulfate
9. 9
   여과filtered
10. 10
    기타Evaporation of the solvent
11. 11
    기타gave an oil that
12. 12
    기타was purified
13. 13
    기타by flush chromatography on neutral alumina (activity III)
14. 14
    기타De-coloration with a small amount of charcoal followed by removal of solvent

실험 절차

Sodium acetylide (1.37 g, 33.5 mmol) suspended in dry DMSO (25 ml) was added to p-methoxyphenyl-thiophene-2-yl-ketone (4.8 g, 22 mmol) in portions with stirring under water bath cooling while bubbling acetylene gas. After addition, the reaction mixture was stirred at room temperature for 2 hours, poured onto crushed ice, acidified with 4 M hydrochloric acid until the pH was approximately 6. After extraction with methylene chloride (20 ml, then 2×10 ml), the mixture was dried over anhydrous sodium sulfate and filtered. Evaporation of the solvent gave an oil that was purified by flush chromatography on neutral alumina (activity III) using hexane/methylene chloride (2:1) as eluent. De-coloration with a small amount of charcoal followed by removal of solvent afforded the relatively clean 1-(4methoxyphenyl)-1-(thiophene-2-yl)prop-2-yn-1-ol as yellow-brown oil.

출처