Reaktion #821653

Reaktionsgleichung

2,3-dimethylbenzoyl chloride

1-benzyl-1H-imidazole

triethylamine

→

title compound

Ausbeute 91.3%

(1-Benzyl-1H-imidazol-2-yl)(2,3-dimethylphenyl)methanone

Ausbeute 91.3%

Lösungsmittel

dichloromethane

water

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAfter completion of the reaction
2. 2
   workup.STIRRINGthe mixture was stirred for a further 15 min
3. 3
   SonstigeThe two layers were separated
4. 4
   Einengenthe organic phase was concentrated in vacuo
5. 5
   workup.ADDITIONTo the residue was added toluene (8.0 L)
6. 6
   Temperaturthe solution was cooled to −5° C., before addition of hydrochloric acid (5N, 8.0 L)
7. 7
   SonstigeThe two layers were separated
8. 8
   workup.ADDITIONthe aqueous layer was adjusted to pH 9-12, by addition of aqueous sodium hydroxide solution (50%)
9. 9
   Extraktionextracted with toluene (4.0 L
10. 10
    EinengenThe combined organic phases were concentrated in vacuo

Vorschrift

To a solution of 1-benzyl-1H-imidazole (1.69 Kg, 10.56 mol) in dichloromethane (14.0 L), at −7° C., was added triethylamine (1.61 kg, 10.56 mol). A solution of 2,3-dimethylbenzoyl chloride (2.0 kg, 11.99 mol) in dichloromethane (6.0 L) was then added dropwise and the reaction mixture was stirred at room temperature for 16 h. The reaction was monitored by Thin layer Chromatography. After completion of the reaction, the reaction mixture was diluted with water (5.0 L) and the mixture was stirred for a further 15 min. The two layers were separated and the organic phase was concentrated in vacuo. To the residue was added toluene (8.0 L) and the solution was cooled to −5° C., before addition of hydrochloric acid (5N, 8.0 L). The two layers were separated and the aqueous layer was adjusted to pH 9-12, by addition of aqueous sodium hydroxide solution (50%), and extracted with toluene (4.0 L and then 8.0 L). The combined organic phases were concentrated in vacuo to give the title compound (2.8 kg).

Quelle