反应详情

温度

155 °C

A solution of 296 mg of imidazole and 131 mg of sodium hydride (80% dispersion in mineral oil) in 2 ml of anhydrous dimethylformamide was stirred at room temperature for 1 hour under nitrogen. 1.0 g of 3-bromobenzaldehyde dimethyl acetal and 30 mg copper powder were then added and the mixture was stirred at 150-160° C. under nitrogen for 36 hours. The cooled mixture was diluted with 20 ml of water and extracted with four 25 ml portions of dichloromethane. The combined extracts were washed with two 25 ml portions of 25% aqueous ammonia, followed by two 25 ml portions of brine and then dried over anhydrous magnesium sulphate. The solution was concentrated under reduced pressure to give 0.75 g of 3-(1-imidazolyl)-benzaldehyde dimethyl acetal as a clear viscous oil.

1. extractionextracted with four 25 ml portions of dichloromethane
2. washThe combined extracts were washed with two 25 ml portions of 25% aqueous ammonia
3. dry with materialdried over anhydrous magnesium sulphate
4. concentrationThe solution was concentrated under reduced pressure