Phosphorus oxychloride → Ethyl [2,4-dichloro-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]acetate

HRID 1628391Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1628391
[Cl:1][C:2]1[C:10]2[NH:9][C:8](=O)[N:7]([CH2:12][C:13]([O:15][CH2:16][CH3:17])=[O:14])[C:6]=2[C:5]([CH:18]([CH2:21][CH3:22])[CH2:19][CH3:20])=[CH:4][CH:3]=1.P(Cl)(Cl)([Cl:25])=O>>[Cl:25][C:8]1[N:7]([CH2:12][C:13]([O:15][CH2:16][CH3:17])=[O:14])[C:6]2[C:5]([CH:18]([CH2:21][CH3:22])[CH2:19][CH3:20])=[CH:4][CH:3]=[C:2]([Cl:1])[C:10]=2[N:9]=1

Komponenten

3

Edukt 2

HCID 24813Phosphorus oxychlorideHCID 86632859Ethyl [4-chloro-7-(1-ethylpropyl)-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl]acetate

Produkt 1

HCID 86632860Ethyl [2,4-dichloro-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]acetateAusbeute 92 %

Reaktionsbedingungen

Temperatur
90 °C

Versuchsvorschrift

A mixture of ethyl [4-chloro-7-(1-ethylpropyl)-2-oxo-2,3-dihydro-1H-benzimidazol-1-yl]acetate (2.57 g, 7.91 mmol) and phosphorus oxychloride (15 mL) was stirred at 90° C. for 3 days. After cooling, phosphorus oxychloride was evaporated in vacuo. The residue was poured into ice-cold 2N aqueous sodium hydroxide and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with a 10-20% ethyl acetate/n-hexane gradient mixture to give the title compound (2.49 g, 7.25 mmol, 92%) as an oil.

Aufarbeitung

  1. temperatureAfter cooling
  2. customphosphorus oxychloride was evaporated in vacuo
  3. additionThe residue was poured into ice-cold 2N aqueous sodium hydroxide
  4. extractionextracted with ethyl acetate
  5. washThe organic layer was washed with brine
  6. dry with materialdried over anhydrous sodium sulfate
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by silica gel column chromatography
  9. washeluting with a 10-20% ethyl acetate/n-hexane gradient mixture

Quellen und Nachweise

ORD-Eintrag
ord-613eeeb4e32645878c5b310845a54fd3
Quelldatensatz
uspto-grants-2014_07
Patentnummer
US08785460B2

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