反应详情

To a solution of 13.9 g (50 mmol) of 3-(4-bromo-2,5-difluorophenyl)cyclopentanol, 7.4 g (50 mmol) of phthalimide and 13.1 g (50 mmol) of triphenylphosphine in 50 ml of dry tetrahydrofuran was added dropwise at room temperature a solution of 8.7 g (50 mmol) of diethyl azodicarboxylate in 20 ml of dry tetrahydrofuran. The reaction was stirred at room temperature for 18 hours and the solvent was removed in vacuo. The residue was triturated with ether and the solid removed by filtration. The filtrate was evaporated in vacuo and the residue was chromatographed on silica gel (E. Merck -230-400 Mesh) eluting with chloroform-ethyl acetate (4:1) to give 15.6 g of the title compound; mp 47°-48°.

1. customthe solvent was removed in vacuo
2. customThe residue was triturated with ether
3. customthe solid removed by filtration
4. customThe filtrate was evaporated in vacuo
5. customthe residue was chromatographed on silica gel (E. Merck -230-400 Mesh)
6. washeluting with chloroform-ethyl acetate (4:1)