4-Bromophenol → 3-Methyl-but-2-enoic acid 4-bromo-phenyl ester

HRID 278665

Reaktionsgleichung

Reaktionsgleichung von HRID 278665
[H-].[Na+].[Br:3][C:4]1[CH:9]=[CH:8][C:7]([OH:10])=[CH:6][CH:5]=1.[CH3:11][C:12]([CH3:17])=[CH:13][C:14](Cl)=[O:15].C(OCC)(=O)C>O1CCCC1.[Cl-].[Na+].O.CCCCCC>[Br:3][C:4]1[CH:9]=[CH:8][C:7]([O:10][C:14](=[O:15])[CH:13]=[C:12]([CH3:17])[CH3:11])=[CH:6][CH:5]=1

Komponenten

8

Edukt 4

HCID 78084-BromophenolHCID 8857Ethyl AcetateHCID 24758Sodium hydrideHCID 1023943-Methyl-2-butenoyl chloride

Produkt 1

HCID 7337973-Methyl-but-2-enoic acid 4-bromo-phenyl esterAusbeute 59 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 8028TetrahydrofuranLösungsmittelHCID 8058HexaneLösungsmittelHCID 57417360Sodium chloride; waterLösungsmittel

Versuchsvorschrift

To a stirred, cooled (ice bath) suspension of sodium hydride (2.4 g, 100 mmol) in anhydrous tetrahydrofuran (200 mL), 4-bromo phenol (17.3 g, 100 mmol) was added followed by 3,3,-dimethyl acryloyl chloride (11.14 mL, 100 mmol). After 4 hours at ambient temperature, the reaction mixture was poured into brine and extracted with diethyl ether (×2). The combined organic phase was dried over anhydrous sodium sulfate, filtered and evaporated in vacuo to afford an oil which was subjected to flash column chromatography over silica get (230-400 mesh) using 2% ethyl acetate in hexane as the eluent to afford the title compound (15 g, 59%).

Aufarbeitung

  1. temperatureTo a stirred, cooled
  2. additionwas added
  3. extractionextracted with diethyl ether (×2)
  4. dry with materialThe combined organic phase was dried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. customevaporated in vacuo
  7. customto afford an oil which
  8. customget (230-400 mesh)

Quellen und Nachweise

ORD-Eintrag
ord-7e6c5bf7766a462a8d14330952042e34
Quelldatensatz
uspto-grants-2002_03
Patentnummer
US06359135B1

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