2-tert-Butyl-1,3-diisopropylisourea → tert-Butyl 3-bromo-2-oxobutanoate

HRID 127889

Reaktionsgleichung

Reaktionsgleichung von HRID 127889
[Br:1][CH:2]([CH3:8])[C:3](=[O:7])[C:4]([OH:6])=[O:5].[C:9](OC(=NC(C)C)NC(C)C)([CH3:12])([CH3:11])[CH3:10]>C(Cl)Cl>[Br:1][CH:2]([CH3:8])[C:3](=[O:7])[C:4]([O:6][C:9]([CH3:12])([CH3:11])[CH3:10])=[O:5]

Komponenten

4

Edukt 2

HCID 110417822-tert-Butyl-1,3-diisopropylisoureaHCID 144712563-Bromo-2-oxobutanoic acid

Produkt 1

HCID 23470149tert-Butyl 3-bromo-2-oxobutanoateAusbeute 47,7 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

A solution of 1.6 g (8.85 mmol) of 3-bromo-2-ketobutyric acid and 7 g (4 equivalents) of O-t-butyl-N,N'-diisopropylpseudourea in 14 ml methylene chloride is stirred overnight at room temperature. After filtration, the solution is washed with NaHCO3 and brine, dried and evaporated to an oil which is chromatographed on silica gel with benzene as eluant to give 1 g (45%) of t-butyl 3-bromo-2-ketobutyrate.

Aufarbeitung

  1. filtrationAfter filtration
  2. washthe solution is washed with NaHCO3 and brine
  3. customdried
  4. customevaporated to an oil which
  5. customis chromatographed on silica gel with benzene as eluant

Quellen und Nachweise

ORD-Eintrag
ord-c830d3d5ac4f43b8a99b12c1711f57cb
Quelldatensatz
uspto-grants-1981_03
Patentnummer
US04257947

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