Reaktion #85691

Reaktionsgleichung

iodomethane

n-butyllithium

N,N-diisopropylamine

1-(4-chlorophenyl)-4-(1,3-dioxolan-2-yl)-1H-imidazole

→

1-(4-chlorophenyl)-4-(1,3-dioxolan-2-yl)-2-methyl-1H-imidazole

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGThe resulting solution was stirred at −78° C. for 30 min
2. 2
   Temperaturto warm to room temperature
3. 3
   Sonstigequenched with water (20 mL)
4. 4
   ExtraktionThe mixture was extracted with ethyl acetate (30 mL)
5. 5
   Extraktionthe organic extract
6. 6
   Waschenwas washed with saturated aqueous sodium chloride (15 mL)
7. 7
   Trocknendried (Na2SO4)
8. 8
   Filtrationfiltered
9. 9
   Einengenconcentrated in vacuo

Vorschrift

A solution of n-butyllithium (1.6 M in hexane, 0.37 mL, 0.60 mmol, 1.5 equiv) was added to a solution of N,N-diisopropylamine (0.085 mL, 0.60 mmol, 1.5 equiv) in THF (1.5 mL) at −78° C. The solution was stirred at −78° C. for 10 min and then a solution of 1-(4-chlorophenyl)-4-(1,3-dioxolan-2-yl)-1H-imidazole (100 mg, 0.40 mmol) in THF (1 mL) was added dropwise. The resulting solution was stirred at −78° C. for 30 min, and then iodomethane (0.042 mL, 0.68 mmol, 1.7 equiv) was added. The solution was allowed to warm to room temperature and then quenched with water (20 mL). The mixture was extracted with ethyl acetate (30 mL) and the organic extract was washed with saturated aqueous sodium chloride (15 mL), dried (Na2SO4), filtered, and concentrated in vacuo to give crude 1-(4-chlorophenyl)-4-(1,3-dioxolan-2-yl)-2-methyl-1H-imidazole. The material was used without further purification. 1H NMR (400 MHz, CDCl3) δ 7.46 (d, J=8.4 Hz, 2H), 7.23 (d, J=8.4 Hz, 2H), 7.09 (s, 1H), 5.88 (s, 1H), 4.20 (m, 2H), 4.03 (m, 2H), 2.35 (s, 3H). MS m/z 265.0 (M+H)+; Rt-0.57 min.

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