依折麦布杂质50

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: (a) 0.312 g of 50% sodium hydride is suspended in 10 ml of anhydrous dimethylformamide, and 1.16 g of 4-[N-(4-chlorophenyl)formimidoyl]phenol is added to the suspension at 20° to 25° C. with stirring. Subsequently over a period of 15 minutes, 1.27 g of ethyl 2-bromo-2-methylpropionate is added dropwise to the resulting mixture at the same temperature with stirring. The mixture is stirred at the same temperature for 30 minutes, then at 50° to 55° C. for 2 hours and thereafter at 80° C. for 3 hours. The reaction mixture is poured into cold water, extracted with ether, and the extract is washed with 5% aqueous solution of sodium hydroxide and then with water. After drying, the solvent is distilled off to give 1.5 g of ethyl 2-[4-{N-(4-chlorophenyl)formimidoyl}phenoxy]-2-methylpropionate. with stirring The mixture is stirred at the same temperature for 30 minutes at 50° to 55° C. for 2 hours at 80° C. for 3 hours extracted with ether the extract is washed with 5% aqueous solution of sodium hydroxide After drying the solvent is distilled off