Acetic Anhydride → 1-(4-Chloro-2-methylphenyl)-3-methyl-1,3-diazinane-2,4-dione
反応式
[CH3:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[NH:9][C:10]([N:12]([CH3:18])[CH2:13][CH2:14][C:15](O)=O)=[O:11].C(OC(=O)C)(=[O:21])C>>[CH3:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[N:9]1[CH2:15][CH2:14][C:13](=[O:21])[N:12]([CH3:18])[C:10]1=[O:11]参加物
3
実験手順
At first, 8.0 g (0.03 moles) of N-(2-methyl-4-chlorophenylcarbamoyl)-N-methyl-β-alanine was added to 250 ml of acetic anhydride, and the mixture was refluxed with heating for 2.5 hours. Acetic anhydride was removed therefrom by distillation under reduced pressure, and precipitated crystals were recrystallized from 60 ml of ethyl acetate and 150 ml of n-hexane, whereby 1.8 g of the desired compound was obtained as crystals having a melting point of 120° to 127° C. (yield: 24.1%).
後処理
- temperaturethe mixture was refluxed
- temperaturewith heating for 2.5 hours
- customAcetic anhydride was removed
- distillationby distillation under reduced pressure