Bromoacetonitrile → 7-Cyano-5-oxoheptanoic acid

HRID 465612

Reaktionsgleichung

Reaktionsgleichung von HRID 465612
C[Si](C)(C)[N-][Si](C)(C)C.[K+].[O:11]=[C:12]([CH3:19])[CH2:13][CH2:14][CH2:15][C:16]([OH:18])=[O:17].Br[CH2:21][C:22]#[N:23]>O1CCCC1>[C:22]([CH2:21][CH2:19][C:12](=[O:11])[CH2:13][CH2:14][CH2:15][C:16]([OH:18])=[O:17])#[N:23]

Komponenten

5

Edukt 3

HCID 11534BromoacetonitrileHCID 184074-Acetylbutyric acidHCID 3251421Potassium bis(trimethylsilyl)amide

Produkt 1

HCID 149867127-Cyano-5-oxoheptanoic acid

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To a solution of potassium hexamethyldisilazide (66 ml, 60 mmol) in dry tetrahydrofuran (140 ml) at -70° is added slowly 5-oxohexanoic acid (36 ml, 30 mmol). The resulting yellow suspension is stirred at -70° for 1 h and bromoacetonitrile (2.2 ml, 32 mmol) is added slowly. The reaction mixture is stirred at -70° for 1 h and then at room temperature for 0.5 h. The reaction is quenched by addition of 1N aqueous hydrochloric acid (100 ml). The aqueous layer is extracted twice with ether. Combined organic layer is dried, filtered and evaporated to obtain a dark oil which is purified by silica gel chromatography using 9:1 ether/hexane with 1% acetic acid as eluent to give 7-cyano-5-oxoheptanoic acid as an oil.

Aufarbeitung

  1. stirringThe reaction mixture is stirred at -70° for 1 h
  2. waitat room temperature for 0.5 h
  3. customThe reaction is quenched by addition of 1N aqueous hydrochloric acid (100 ml)
  4. extractionThe aqueous layer is extracted twice with ether
  5. customCombined organic layer is dried
  6. filtrationfiltered
  7. customevaporated
  8. customto obtain a dark oil which
  9. customis purified by silica gel chromatography

Quellen und Nachweise

ORD-Eintrag
ord-8b89643d0bdd44568e4cd81cca446028
Quelldatensatz
uspto-grants-1992_10
Patentnummer
US05153214

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