反应详情

To a solution of 3-(phthalimido)propionic acid (6.0 g) and triethylamine (2.77 g) in benzene (60 ml) was added diphenylphosphoryl azide (7.53 g), and the mixture was refluxed for 40 minutes. Tert-butanol (4.23 g) was added thereto, and the mixture was refluxed overnight. After cooling, the reaction mixture was washed with saturated sodium bicarbonate solution, water and brine, dried over magnesium sulfate and evaporated in vacuo. The residue was purified by flash chromatography (n-hexane-ethyl acetate) and crystallized from diisopropyl ether to give N-(2-tert-butoxycarbonylaminoethyl)phthalimide (5.74 g) as colorless crystals.

1. temperaturethe mixture was refluxed for 40 minutes
2. temperaturethe mixture was refluxed overnight
3. temperatureAfter cooling
4. washthe reaction mixture was washed with saturated sodium bicarbonate solution, water and brine
5. dry with materialdried over magnesium sulfate
6. customevaporated in vacuo
7. customThe residue was purified by flash chromatography (n-hexane-ethyl acetate)
8. customcrystallized from diisopropyl ether