反应详情

A solution of thiophene-2-methylamine (4.203 g, 37.13 mmol) and of phtalic anhydride (5.00 g, 33.76 mmol) in toluene (100 mL) was stirred and heated at reflux for 3 h to remove the formed water by azeotropic distillation (Dean-Stark). The solvent was then evaporated under vacuum. The residue was dissolved in DCM (100 mL), washed with water (3×30 mL), dried over MgSO4, filtered and concentrated to afford the title compound as a white solid (7.78 g, 95%). 1H NMR (CDCl3, 300 MHz) δ 7.84 (d, 1H. J=5.4 Hz), 7.83 (d, 1H. J=5.4 Hz), 7.69 (d, 1H, J=5.4 Hz), 7.68 (d, 1H, J=5.4 Hz), 7.20 (d, 0.5H, J=5.2 Hz), 7.19 (d, 0.5H, J=5.2 Hz), 7.14 (m, 1H), 6.92 (d, 0.5H, J=5.1 Hz), 6.91 (d, 0.5H, J=5.1 Hz), 5.01 (s, 2H). HPLC (Condition A), Rt: 4.11 min (HPLC purity: 99.2%).

1. temperatureheated
2. temperatureat reflux for 3 h
3. customto remove the formed water
4. distillationby azeotropic distillation (Dean-Stark)
5. customThe solvent was then evaporated under vacuum
6. dissolutionThe residue was dissolved in DCM (100 mL)
7. washwashed with water (3×30 mL)
8. dry with materialdried over MgSO4
9. filtrationfiltered
10. concentrationconcentrated