반응 #3039

반응 방정식

5-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-3-[2-(acetyloxy) ethyl]-2-thioxo-4-thiazolidinone

Tri-n-butyl tin hydride

AIBN

→

desired titled compound

수율 59.7%

5-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-3-[2-(acetyloxy)ethyl]-4-thiazolidinone

수율 59.7%

용매

toluene

반응 조건

후처리

1. 1
   온도the solution heated
2. 2
   온도at reflux temperature for an additional 10 minutes
3. 3
   온도After cooling
4. 4
   세척the mixture was washed with 1.25l of 1N hydrochloric acid
5. 5
   기타a precipitate separated
6. 6
   기타The liquid portion was decanted off
7. 7
   기타the resulting residue was purified by chromatography over silica gel
8. 8
   세척eluting with a gradient of 25-50% of ethyl acetate in hexane
9. 9
   농축concentrated in vacuo

실험 절차

Under a nitrogen atmosphere, 82.2 g of 5-[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methylene]-3-[2-(acetyloxy) ethyl]-2-thioxo-4-thiazolidinone in 950 ml of toluene was heated to 65° C. Tri-n-butyl tin hydride (219.7 g) and AIBN (4.65 g) were added and the solution heated at reflux temperature for an additional 10 minutes. After cooling, the mixture was washed with 1.25l of 1N hydrochloric acid followed by 500 ml of a saturated sodium chloride solution. The organic layer was stripped and allowed to stand overnight, during which time a precipitate separated. The liquid portion was decanted off, and the resulting residue was purified by chromatography over silica gel, eluting with a gradient of 25-50% of ethyl acetate in hexane. The appropriate fractions were combined and concentrated in vacuo to provide 45.7 g of the desired titled compound, m.p.=152°-155° C.

출처