Beta-Propiolactone → 3-(4-Fluorophenylthio)propanoic acid

HRID 1764833Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1764833
[F:1][C:2]1[CH:7]=[CH:6][C:5]([SH:8])=[CH:4][CH:3]=1.[C:9]1(=[O:13])[O:12][CH2:11][CH2:10]1.[H-].[Na+]>C1COCC1>[F:1][C:2]1[CH:7]=[CH:6][C:5]([S:8][CH2:11][CH2:10][C:9]([OH:13])=[O:12])=[CH:4][CH:3]=1

Komponenten

5

Edukt 3

HCID 2365Beta-PropiolactoneHCID 24758Sodium hydrideHCID 677894-Fluorothiophenol

Produkt 1

HCID 27788893-(4-Fluorophenylthio)propanoic acidAusbeute 89 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Reaktionsbedingungen

Temperatur
0 °C

Versuchsvorschrift

p-Fluorothiophenol (5 g, 40 mmol) and β-propiolactone (2.8 g, 40 mmol) were dissolved in THF (36 mL of freshly distilled) and then placed in an ice bath. 95% sodium hydride (1 g, 42.9 mmol) was added in small portions over 1 hour. The reation was allowed to stir at 0° C. for 2 hours, then placed in the freezer overnight. The reaction was quenched with ice chips and then acidified with concentrated hydrogen chloride until a pH of 2. The product was extracted with ethyl acetate (1×200 mL) and dichloromethane (2×200 mL), dried (sodium sulfate) and concentrated to give 3-(4-fluorophenylthio)propanoic acid (7.08 g, 89%). 1H NMR (CDCl3, 300 MHz): δ7.42-7.35 (m, 2H), 7.02 (t, 2H, J=8.6 Hz), 4.35 (t, 1H, J=6.2 Hz), 3.10 (t, 2H, J=7.3 MHz), 2.63 (t, 2H, J=7.3 Hz) ppm.

Aufarbeitung

  1. distillationof freshly distilled) and
  2. customthen placed in an ice bath
  3. customplaced in the freezer overnight
  4. customThe reaction was quenched with ice chips
  5. extractionThe product was extracted with ethyl acetate (1×200 mL) and dichloromethane (2×200 mL)
  6. dry with materialdried (sodium sulfate)
  7. concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag
ord-9ce6a3ff3d054871a3e7ca9541351a5e
Quelldatensatz
uspto-grants-2007_06
Patentnummer
USRE039679E1

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