Acetone → 7-fluoro-2,2-dimethyl-3,4-dihydro-2H-1-benzopyran-4-one

HRID 1021364

Reaktionsgleichung

Reaktionsgleichung von HRID 1021364
[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[C:4]([OH:11])[CH:3]=1.[CH3:12][C:13](=O)[CH3:14].N1CCCC1>C1C=CC=CC=1.C(OCC)(=O)C>[F:1][C:2]1[CH:3]=[C:4]2[C:5]([C:8](=[O:10])[CH2:9][C:13]([CH3:14])([CH3:12])[O:11]2)=[CH:6][CH:7]=1

Komponenten

6

Edukt 3

HCID 180AcetoneHCID 31268PyrrolidineHCID 27373264'-Fluoro-2'-hydroxyacetophenone

Produkt 1

HCID 152053737-fluoro-2,2-dimethyl-3,4-dihydro-2H-1-benzopyran-4-oneAusbeute 70,7 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 241BenzeneLösungsmittelHCID 8857Ethyl AcetateLösungsmittel

Reaktionsbedingungen

Temperatur
80 °C

Versuchsvorschrift

To 1-(4-fluoro-2-hydroxyphenyl)ethanone (5.75 g, 37.3 mmol) and propan-2-one (12 mL, 37.3 mmol) in benzene (50 mL) was added pyrrolidine (3.11 mL, 37.3 mmol) and the reaction heated at 80° C. for 3 hours. The reaction was diluted with ethyl acetate (50 mL), washed with 1N HCl (50 mL), brine (50 mL), dried over magnesium sulfate and concentrated. The residue was purified by silica gel chromatography, eluting with a gradient of 5% ethyl acetate/hexanes to 50% ethyl acetate, to provide the title compound (5.12 g, 70.7% yield).

Aufarbeitung

  1. washwashed with 1N HCl (50 mL), brine (50 mL)
  2. dry with materialdried over magnesium sulfate
  3. concentrationconcentrated
  4. customThe residue was purified by silica gel chromatography
  5. washeluting with a gradient of 5% ethyl acetate/hexanes to 50% ethyl acetate

Quellen und Nachweise

ORD-Eintrag
ord-59f91cded47049dbb1dbcaa67bbc574a
Quelldatensatz
uspto-grants-2014_05
Patentnummer
US08716498B2

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