(Tert-butoxycarbonyl)aspartic acid → 3-(Boc-amino)dihydrofuran-2,5-dione

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A mixture of 1 g (4.29 mmol) of N-(tert-butoxycarbonyl)-DL-aspartic acid and 0.98 g (5.15 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI) in 100 mL of DCM, was stirred at room temperature overnight. The solution was extracted three times with 5% aq. NaHSO4, the organic extracts were dried over anh. sodium sulfate and the solvent evaporated under vacuum. In this way 750 mg of the title compound were recovered. 1H NMR (400 MHz, DMSO-D6) δ ppm 1.38 (s, 9 H) 2.78-2.90 (m, 1 H) 3.15-3.28 (m, 1 H) 4.54-4.65 (m, 1 H) 7.73 (d, J=7.91 Hz, 1 H).

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