반응 #320818

반응 방정식

water

bromoacetaldehyde diethylacetal

NaH

17β-(3-furyl)-5β-androstane-3β,14β-diol

→

3β-(2,2-diethoxy-ethoxy)-17β-(3-furyl)-5β-androstan-14β-ol

용매

tetrahydrofuran

반응 조건

후처리

1. 1
   workup.ADDITIONwere added at room temperature in a nitrogen atmosphere
2. 2
   온도at reflux for 6 hrs
3. 3
   온도at reflux temperature for 4 hrs
4. 4
   workup.DISTILLATIONthe tetrahydrofuran was distilled under reduced pressure
5. 5
   추출The residue was extracted with methylene chloride
6. 6
   건조the organic layer was dried over anhydrous sodium sulfate
7. 7
   기타evaporated to dryness under reduced pressure
8. 8
   기타The crude product was purified by flash-chromatography (SiO2)

실험 절차

To a suspension of 5.5 g of NaH (60% dispersion in mineral oil) in 400 ml of dry tetrahydrofuran 7.0 g of 17β-(3-furyl)-5β-androstane-3β,14β-diol (II-a: Ref. comp.) (Minato H. and Nagasaki T., J. Chem. Soc.(C), 1966, 377) were added at room temperature in a nitrogen atmosphere. The mixture was kept at reflux for 6 hrs, then 26 ml of bromoacetaldehyde diethylacetal were added; the suspension was kept at reflux temperature for 4 hrs, 50 ml of water were added cautiously, and the tetrahydrofuran was distilled under reduced pressure. The residue was extracted with methylene chloride, the organic layer was dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure. The crude product was purified by flash-chromatography (SiO2) using n-hexane/ethyl acetate 80/20 as eluant to give 6.9 g of 3β-(2,2-diethoxy-ethoxy)-17β-(3-furyl)-5β-androstan-14β-ol, as a dense oil.

출처