反应详情

To a suspension of 3-Benzyloxycarbonylamino-4,4-diethoxy-butyric acid tert-butyl ester (0.50 g, 1.31 mmol) in Ethyl acetate (50 mL) at room temperature was added 10 mol % Pd/C (˜0.05 g). The reaction flask was purged between H2 (1atm) and vacuum three times before stirring under H2 (1atm) at room temperature. After stirring at room temperature for 3 hrs, the reaction mixture was filtered through celite and then evaporated to dryness to give the title compound (0.32 g, 98%) as a clear oil. 1HNMR (CDCl3) δ 4.29 (d, J=5.4 Hz, 1H), 3.79–3.67 (m, 2H), 3.61–3.49 (m, 2H), 3.29–3.21 (m, 1H), 2.60–2.53 (dd, J=16.2, 4.2 Hz, 1H), 2.30–2.21 (dd, J=16.2, 9.0 Hz, 1H), 1.46 (s, 9H), 1.25–1.19 (m, 3H).

1. customThe reaction flask was purged between H2 (1atm) and vacuum three times
2. stirringAfter stirring at room temperature for 3 hrs
3. filtrationthe reaction mixture was filtered through celite
4. customevaporated to dryness