反应详情

0.149 mole of 2,3-dimethoxybenzaldehyde is added over 5 hours at room temperature to a solution of 0.149 mole of 1-(1-triphenylmethyl-1H-imidazol-4-yl)-1-ethanone prepared in Example 2.1 in a mixture of 800 ml of ethanol and 186 ml of a 2N aqueous solution of sodium hydroxide. The reaction medium is then brought to pH 7.5 by addition of a 5N aqueous solution of hydrochloric acid. The ethanol is distilled off and a solid is formed, which precipitates. This solid is filtered off and washed with water before drying. The solid is redissolved in 2 liters of boiling 2-propanol and the insoluble salts are filtered off. Half the 2-propanol is evaporated off and the 3-(2,3-dimethoxyphenyl)-1-(1-triphenylmethyl-1H-imidazol-4-yl)-2-propen-1-one is recrystallized.

1. distillationThe ethanol is distilled off
2. customa solid is formed
3. customwhich precipitates
4. filtrationThis solid is filtered off
5. washwashed with water
6. custombefore drying
7. dissolutionThe solid is redissolved in 2 liters of boiling 2-propanol
8. filtrationthe insoluble salts are filtered off
9. customHalf the 2-propanol is evaporated off
10. customthe 3-(2,3-dimethoxyphenyl)-1-(1-triphenylmethyl-1H-imidazol-4-yl)-2-propen-1-one is recrystallized