反应详情

温度

100 °C

A suspension of 7.32 g (16.1 mmol) of 2,4-bis-ethoxycarbonyl-3-(4-nitro-phenyl)-pentanedioic acid diethyl ester (as prepared in the previous step) in concentrated HCl (15 mL) was heated to 100° C. for 22 h. The mixture was cooled to RT, and the resulting precipitate was filtered, washed with cold water, and air-dried to afford 3.58 g (88%) of the title compound as an off-white solid: 1H-NMR (CD3OD; 400 MHz): δ 8.12 (d, 2H, J=8.8 Hz), 7.58 (d, 2H, J=8.8 Hz), 3.77-3.68 (m, 1H), 2.87-2.66 (m, 4H).

1. temperatureThe mixture was cooled to RT
2. filtrationthe resulting precipitate was filtered
3. washwashed with cold water
4. customair-dried