反应详情

温度

0 °C

2.72 ml of a 1.6 M solution of n-butyllithium in n-hexane (4.4 mmol) were added at 0° C. to a solution of 1.219 g (5.4 mmol) of diethylphosphonoacetic acid ethyl ester in 30 ml of dry THF. After stirring at 0° C. for 30 min, 0.8 g (3.8 mmol) of 5-chloro-3-methyl-2-phenyl-3H-imidazole-4-carbaldehyde in 10 ml of THF were added. The reaction mixture was allowed to stand overnight and then concentrated. The residue was taken up in 100 ml of ethyl acetate, and the solution washed three times with 30 ml each of a sodium hydrogencarbonate solution, dried with magnesium sulfate and evaporated. The obtained crude 3-(5-chloro-3-methyl-2-phenyl-3H-imidazol-4-yl)-acrylic acid ethyl ester was stirred in 5.4 ml of 1 N sodium hydroxide solution and 20 ml of tert-butanol at room temperature for 24 h. After concentration, 10 ml of water were added, and the mixture was acidified to pH=5 with hydrochloric acid. The mixture was stirred for 1 h, and the precipitated product was filtered off with suction and dried.

1. waitto stand overnight
2. concentrationconcentrated
3. washthe solution washed three times with 30 ml each of a sodium hydrogencarbonate solution
4. dry with materialdried with magnesium sulfate
5. customevaporated