反应详情

温度

50 °C

Hexadecanedioic acid mono-tert-butyl ester (0.4 g, 1.17 mmol) was dissolved in NMP (6 mL). N-Ethyl-N-(3-dimethylaminopropyl)-carbodiimide hydrochloride (0.223 g, 0.1.17 mmol) and 1-hydroxy-7-azabenzotriazole (0.159 g, 1.17 mmol) was added and the mixture was stirred at 50° C. for 1 hour and then allowed to cool to room temperature. Diisopropylethylamin (0.6 mL, 3.5 mmol) was added followed by methyl 4-aminobenzoate (0.353 g, 2.34 mmol). The mixture was stirred overnight under nitrogen at room temperature. The mixture was poured into saturated aqueous NaCl (50 mL), washed with diethylether (3×100 mL between ethyl acetate. The organic phases were collected, dried (Na2SO4) and solvent removed in vacuo. The crude material was purified on silica using ethyl acetate/heptane (50:50), to give pure 4-(15-tert-Butoxycarbonylpentadecanoylamino)benzoic acid methyl ester (235 mg, 42%)

1. temperatureto cool to room temperature
2. stirringThe mixture was stirred overnight under nitrogen at room temperature
3. washwashed with diethylether (3×100 mL between ethyl acetate
4. customThe organic phases were collected
5. dry with materialdried (Na2SO4) and solvent
6. customremoved in vacuo
7. customThe crude material was purified on silica