Perchloric Acid → tert-Butyl 2-bromo-3-phenylpropionate
反応式
[Br:1][CH:2]([CH2:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)[C:3]([OH:5])=[O:4].Cl(O)(=O)(=O)=O.C(=O)(O)[O-].[Na+]>C(OC(C)(C)C)(=O)C>[Br:1][CH:2]([CH2:6][C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1)[C:3]([O:5][C:7]([CH3:12])([CH3:8])[CH3:6])=[O:4]参加物
5
実験手順
A mixture of 10.1 g (44.1 mmol) of 2-bromo-3-phenylpropionic acid in tert-butyl acetate (150 ml) was cooled in an ice/water bath. 0.5 ml of perchloric acid was added, and the reaction solution was stirred at room temperature overnight. The reaction solution was slowly added to a saturated aqueous sodium bicarbonate solution (200 ml) and the organic phase was separated off. The aqueous phase was extracted twice with 60 ml of ethyl acetate each time, the combined organic phases were washed with saturated aqueous sodium bicarbonate solution and dried over magnesium sulfate, and the solvent was removed in vacuo. The residue was purified by chromatography on silica gel (mobile phase gradient 20% acetic acid in cyclohexane). Yield: 6.76 g (54%) of colorless oil