反应详情

To a stirred solution of [2-(3-chloro-phenyl)-2-hydroxy-ethyl]-carbamic acid tert-butyl ester (20 g, 73.5 mmol), phthalimide (11.1 g, 73.5 mmol) and PPh3 (25.1 g, 95.5 mmol) in THF (500 mL) was added DEAD (11.4 mL, 95.5 mmol) dropwise at −5 to 0° C. The reaction mixture was stirred at room temperature for 3 hours. Then the mixture was concentrated to dryness. The residue was purified by column chromatography (ethyl acetate:petroleum ether, 1:10) to afford [2-(3-chloro-phenyl)-2-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)-ethyl]-carbamic acid tert-butyl ester. (Yield 20 g, 69%).

1. concentrationThen the mixture was concentrated to dryness
2. customThe residue was purified by column chromatography (ethyl acetate:petroleum ether, 1:10)