反应详情

温度

87.5 °C

A mixture of 3-nitrophthalic anhydride (1.5 g, 7.8 mmol) and L-glutamine (1.14 g, 7.8 mmol) in DMF (15 mL) is heated at 85-90° C. for 4 hours. The mixture is concentrated in vacuo and the residue is slurried with water (30 mL). The resulting slurry is filtered and the solid is washed with water (10 mL), dried (60° C., <1 mm Hg) to give 2-(4-nitro-1,3-dioxoisoindolin-2-yl)-4-carbamoylbutanoic acid (1.82 g, 73%); mp 182-184° C.; 1H NMR (DMSO-d6) δ8.33 (d, J=7.7 Hz, 1H), 8.22 (d, J=7.0 Hz, 1H), 8.11 (t, J=7.8 Hz, 1H), 7.19 (s, 1H), 6.73 (s, 1H), 4.82-4.77 (dd, J=4.6 and 9.8 Hz, 1H), 2.36-2.11 (m, 4H); 13C NMR (DMSO-d6) δ173.21, 170.03, 165.43, 162.75, 144.45, 136.70, 132.98, 128.83, 127.25, 122.52, 51.87, 31.31, 23.87; Anal. Calcd. For C13H11N3O7: C, 48.60; H, 3.45; N, 13.08. Found: C, 48.52; H, 3.28; N, 13.05.

1. concentrationThe mixture is concentrated in vacuo
2. filtrationThe resulting slurry is filtered
3. washthe solid is washed with water (10 mL)
4. customdried (60° C., <1 mm Hg)