4-Methoxybenzenecarboximidamide → 2-(4-Methoxyphenyl)-4-(2-nitrophenyl)imidazole

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 2-bromo-2′-nitroacetophenone (18 g), 4-methoxybenzamidine (20 g), and silica gel (20 g) in acetonitrile (500 ml) is heated at 40° C. for 24 hours. The reaction is evaporated and the residue put on a layer of silica gel and eluted with 50% ethyl acetate/hexane (1500 ml). The solution is evaporated under reduced pressure to approximately 250 ml and extracted with 5% HCl (3×250 ml). The combined aqueous solution is basified with K2CO3 and extracted with ethyl acetate (3×400 ml) to afford 2-(4-methoxyphenyl)-4-(2-nitrophenyl)-imidazole (17 g) as a dark yellow oil which is used in the next step without further purification.

Herkunft & Nachweise