alpha-Bromo-o-chlorotoluene → 1H-Imidazole, 2-butyl-1-[(2-chlorophenyl)methyl]-

HRID 36969

Reaktionsgleichung

[CH2:1]([C:5]1[NH:6][CH:7]=[CH:8][N:9]=1)[CH2:2][CH2:3][CH3:4].C[O-].[Na+].[Cl:13][C:14]1[CH:21]=[CH:20][CH:19]=[CH:18][C:15]=1[CH2:16]Br>CO>[CH2:1]([C:5]1[N:6]([CH2:16][C:15]2[CH:18]=[CH:19][CH:20]=[CH:21][C:14]=2[Cl:13])[CH:7]=[CH:8][N:9]=1)[CH2:2][CH2:3][CH3:4]

Komponenten

Reaktionsbedingungen

Temperatur: 50 °C

Versuchsvorschrift

2-n-Butylimidazole (9.7 g, 0.078 mol) was dissolved in methanol (50 mL) and added dropwise to a solution of sodium methoxide (from sodium hydride (2.31 g, 0.0934 mol) in methanol (250 mL)). After one hour the solution was evaporated to dryness, and the sodium salt was taken up in dry dimethylformamide (150 mL) and 2-chlorobenzyl bromide (16.3 g, 0.079 mol) was added. The mixture was heated at 50° C. for 17 hours under argon, poured onto ice water and the product was extracted into ethyl acetate. The extract was washed, dried, and concentrated to give 18.5 g of crude product which was chromatographed over silica gel with 2:1 ethyl acetate/hexane to provide 11.9 g (61%) of 2-n-butyl-1-(2-chlorophenyl)methyl-1H-imidazole as an oil. Thin layer chromatography on silica gel with 4:1 ethyl acetate/hexane gave an Rf value of 0.59.

Aufarbeitung

customAfter one hour the solution was evaporated to dryness
additionpoured onto ice water
extractionthe product was extracted into ethyl acetate
washThe extract was washed
customdried
concentrationconcentrated
customto give 18.5 g of crude product which
customwas chromatographed over silica gel with 2:1 ethyl acetate/hexane

Quellen und Nachweise

ORD-Eintrag: ord-72c02d888f2d4a56b563bac835b9390c
Quelldatensatz: uspto-grants-1995_05
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US05418250

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