5-Bromo-1-methyl-1H-imidazole → (1-Methyl-1H-imidazol-5-yl)(3-methyl-4-nitrophenyl)methanone

Beteiligte Stoffe

Reaktionsschritte

A solution of EtMgBr (3.0 M in diethylether, 15.1 mL, 45.2 mmol) was added dropwise, to a solution of 5-bromo-1-methyl-1H-imidazole (7.28 g, 45.2 mmol) in dry DCM (40 mL) at 0° C. and stirred for 10 minutes. The mixture was then stirred at room temperature for 30 minutes, cooled in an ice-brine bath and N-methoxy-N,3-dimethyl-4-nitrobenzamide (8.45 g, 37.7 mmol, Intermediate 14: step a) dissolved in 22 mL of DCM was added dropwise. A dark brown solid mass formed. The ice bath was removed and mixture stirred at room temperature for 18 hours. Water was added to the suspension followed by 6 M aqueous HCl slowly to neutralize the mixture (pH=6-7). More DCM was added and layers separated. The organic layer was dried over MgSO4, filtered and concentrated. Et2O was added, the slurry sonicated, and precipitates were filtered and dried to provide the title compound.

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