Phosphorus oxychloride → [2-Methyl-7,8-dihydro[1,4]dioxino[2,3-g][1,3]benzoxazol-8-yl]methanol

HRID 1072442Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1072442
[OH:1][C:2]1[C:11]2[O:10][C@@H:9]([CH2:12][OH:13])[CH2:8][O:7][C:6]=2[CH:5]=[CH:4][C:3]=1C(=NO)C.P(Cl)(Cl)(Cl)=O.C([O-])(=O)C.[Na+].C[N:29](C)[C:30](=O)[CH3:31].C(#N)C>>[CH3:31][C:30]1[O:1][C:2]2[C:11]3[O:10][CH:9]([CH2:12][OH:13])[CH2:8][O:7][C:6]=3[CH:5]=[CH:4][C:3]=2[N:29]=1

Komponenten

5

Edukt 4

HCID 24813Phosphorus oxychlorideHCID 517045Sodium AcetateHCID 21187609acetonitrile N,N-dimethylacetamide2×HCID 136358527HCID 136358527, Verbindung

Produkt 1

HCID 21892056[2-Methyl-7,8-dihydro[1,4]dioxino[2,3-g][1,3]benzoxazol-8-yl]methanol

Versuchsvorschrift

3.03 g (12.6 mmole) of 1-[(3S)-5-hydroxy-3-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl]-1-ethanone oxime was dissolved in a mixture of 1:3 N,N-dimethylacetamide/acetonitrile (100 mL). The solution was cooled in an ice/water bath and a solution of phosphorus oxychloride (1.26 mL, 35 mmole) in 1:3 N,N-dimethylacetamide/acetonitrile (30 mL) was added. The reaction mixture was stirred under nitrogen over a period of 48 hours. It was then added to an ice cold, saturated solution of sodium acetate, extracted with ethyl acetate, dried over magnesium sulfate, filtered and evaporated in vacuum. The resulting crude oil was column chromatographed on silica gel with 60% hexane/ethyl acetate to remove impurities and the product eluted with 40% hexane/ethyl acetate. After evaporation of the solvent in vacuum, 2.08 g (75%) of the (S)-enantiomer of the title compound was obtained as a white solid, m.p. 120° C. MS (ESI) m/z 222 (M+H)+.

Aufarbeitung

  1. temperatureThe solution was cooled in an ice/water bath
  2. extractionextracted with ethyl acetate
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. customevaporated in vacuum
  6. customchromatographed on silica gel with 60% hexane/ethyl acetate
  7. customto remove impurities
  8. washthe product eluted with 40% hexane/ethyl acetate
  9. customAfter evaporation of the solvent in vacuum, 2.08 g (75%) of the (S)-enantiomer of the title compound
  10. customwas obtained as a white solid, m.p. 120° C

Quellen und Nachweise

ORD-Eintrag
ord-e718d2a419b24178b44f53b20f4fb920
Quelldatensatz
uspto-grants-2005_06
Patentnummer
US06911445B2

Notizen zur Reaktion

Wird geladen…