产品为类白色固体粉末,N-(2-((tert-Butoxycarbonyl)amino)ethyl)maleimide (750 mg, 3.12 mmol) was dissolved in 4 M HCl in ethyl acetate (20 mL) and stirred for 8 h at room temperature. Then, addition of diethyl ether at 0 °C. provided the title compound as a white precipitate (524 mg, 2.97 mmol, 95.2percent yield). 1H NMR (500 MHz, MeOD): δ 6.90 (s, 2H), 3.83-3.79 (m, 2H), 3.17-3.13 (m, 2H).
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