中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2-环己基异吲哚-1,3-二酮 | N-cyclohexylphthalimide | 2133-65-5 | C14H15NO2 | 229.279 |
2-溴-4-(1,3-二氧代-1,3-二氢-2H-异吲哚-2-基)丁酸 | 2-bromo-4-(1,3-dioxoisoindolin-2-yl)butanoic acid | 35197-64-9 | C12H10BrNO4 | 312.12 |
The syntheses of eight 2-alkylamino-4-aminobutyric acids are described. The starting material is 4-butyrolactone, which is opened with potassium phthalimide to give 4-phthalimidobutyric acid. After bromination the 2-bromo-4-phthalimidobutyric acid, obtained in excellent yield, is treated with aliphatic amines in alcoholic medium to give the desired substituted 2,4-diaminobutyric acids, which were characterized as the monohydrochlorides and the di(phenylcarbamates). Three of them cyclized easily to give the corresponding hydantoins. In the course of the reaction, substituted diamides of phthalic acid were isolated and characterized.