5-Bromo-1-methyl-1H-imidazole → (1-Methyl-1H-imidazol-5-yl)(4-nitrophenyl)methanone

Beteiligte Stoffe

Reaktionsschritte

To a solution of 5-bromo-1-methyl-1H-imidazole (3.22 g, 19.98 mmol) in DCM (15 mL) was added ethyl magnesium bromide (6.66 mL, 19.98 mmol, 3.0 M in diethyl ether) dropwise over a 10 minute period. The resulting orange-red solution was stirred at room temperature for 15 minutes, cooled in an ice bath to 0° C. and N-methoxy-N-methyl-4-nitrobenzamide (3.5 g, 16.65 mmol, Intermediate 7: step a) dissolved in DCM (10 mL) was added dropwise. The ice bath was removed and the solid suspension stirred at room temperature for 48 hours. Water was added followed by 6 M aqueous HCl to a neutral pH (pH=6-7). The aqueous mixture was extracted with DCM, dried over Na2SO4, filtered and concentrated. Et2O was added and the mixture sonicated. The precipitate was collected by filtration and dried to provide the title compound as a tan solid.

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