反应详情

A stirred mixture of 2,3,4,5-tetrachlorophthalic acid anhydride (2.85 g, 10.0 mmol) and 3-amino-3-(4-methoxyphenyl)propionic acid (1.95 g, 10.0 mmol) in 25 mL of acetic acid under nitrogen was heated to reflux for 4.5 hours. A solid formed as the reaction mixture cooled. The resulting slurry was filtered and the solid dried in vacuo (60° C., <2 mm) to afford 4.24 g (92%) of 3-(2,3,4,5-tetrachlorophthalimido)-3-(4-methoxyphenyl)-propionic acid as an off-white solid contaminated with ˜1% acetic acid: mp 235.6-238° C.; 1H NMR (DMSO-d6) δ12.44 (br s, 1H, COOH), 7.36 (d, J=8.7 Hz, 2H), 6.90 (d, 1 H, J=8.7 Hz), 5.64 (m, 1H), 3.72 (s, 3H), 3.35 (m, 2H); 13C NMR (DMSO-d6) δ171.5, 163.0, 158.8, 138.4, 129.9, 128.6, 128.2, 127.6, 113.8, 55.0, 50.2, 35.6. Anal. Calcd for C18H11NO5Cl4. Theory: C, 46.68; H, 2.39; N, 3.02. Found: C, 46.58; H, 2.31; N,2.91.

1. temperaturewas heated
2. temperatureto reflux for 4.5 hours
3. customA solid formed as the reaction mixture
4. temperaturecooled
5. filtrationThe resulting slurry was filtered
6. customthe solid dried in vacuo (60° C., <2 mm)