Acetic Anhydride → 7-[2-(3-Acetyloxyoctyl)-4-oxo-3-thiazolidinyl]heptanoic Acid
反応式
[OH:1][CH:2]([CH2:20][CH2:21][CH2:22][CH2:23][CH3:24])[CH2:3][CH2:4][CH:5]1[N:9]([CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][C:16]([OH:18])=[O:17])[C:8](=[O:19])[CH2:7][S:6]1.[C:25](OC(=O)C)(=[O:27])[CH3:26]>C(OCC)(=O)C>[C:25]([O:1][CH:2]([CH2:20][CH2:21][CH2:22][CH2:23][CH3:24])[CH2:3][CH2:4][CH:5]1[N:9]([CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][C:16]([OH:18])=[O:17])[C:8](=[O:19])[CH2:7][S:6]1)(=[O:27])[CH3:26]参加物
4
反応条件
- 温度
- 60 °C
実験手順
A mixture of 7-[2-(3-hydroxyoctyl)-4-oxo-3-thiazolidinyl]heptanoic acid (9.0 g., 0.025 mole) and acetic anhydride (6.1 g., 0.06 mole) is heated at 60° C. for 18 hours. The resulting mixture is cooled to room temperature and dissolved in ethyl acetate providing a clear solution which is extracted with an ice-cold solution of sodium hydroxide (8 g.) in water (150 ml.). The basic solution is quickly separated and acidified with concentrated hydrochloric acid. The oily acid which separates is extracted with ether. The organic extract is washed with water, dried over sodium sulfate, and filtered. Evaporation of the filtrate in vacuo at 40° to 50° C. leaves a residual oil which is purified via application to a silica gel (150 g.) column with chloroform. Elution with chloroform-methanol (99:1; v:v) provides the title compound as a colorless, viscous oil.