反应详情

To a mixture of 3,4-dihydro-6-(3,4-dimethoxyphenyl)-3-methyl-4-(2,4,6-trimethylphenylimino)-2(1H)-pyrimidinone (2.73 g) and potassium tert-butoxide (1.0 g) in dimethylformamide (27 ml) was added ethyl iodide (1.2 ml) and mixture was stirred for 3 hours. Then another potassium tert-butoxide (1.1 g) and ethyl iodide (0.57 ml) were added. The mixture was stirred for more 2 hours and poured into water. The precipitate was collected by filtration and added to 1N hydrochloric acid (15 ml). The mixture was refluxed for 5 hours. After being cooled, the reaction mixture was adjusted to pH 8.5 with aqueous sodium hydroxide. The precipitate was collected by filtration and added to diisopropyl ether (50 ml). The resultant mixture was filtered and the filtrate was evaporated in vacuo. The residue was recrystallized from a mixture of ethanol and water (3:1) to give 3,4-dihydro-6-(3,4-dimethoxyphenyl)-1-ethyl-3-methyl-4-(2,4,6-tri-methylphenylimino)-2(1H)-pyrimidinone (1.6 g). mp 116° -118° C.

1. stirringThe mixture was stirred for more 2 hours
2. filtrationThe precipitate was collected by filtration
3. additionadded to 1N hydrochloric acid (15 ml)
4. temperatureThe mixture was refluxed for 5 hours
5. temperatureAfter being cooled
6. filtrationThe precipitate was collected by filtration
7. additionadded to diisopropyl ether (50 ml)
8. filtrationThe resultant mixture was filtered
9. customthe filtrate was evaporated in vacuo
10. customThe residue was recrystallized from a mixture of ethanol and water (3:1)