反应详情

温度

60 °C

2-Amino-3-methoxybenzonitrile (Step 2, 26.6 g, 179 mmol) was suspended in ethylenediamine (250 mL) and degassed thoroughly. To this was added sulfur powder (8 g, 251 mmol) slowly, then the reaction was heated to 60° C. and stirred 5 h. The reaction was then cooled, concentrated under reduced pressure, then treated with water (300 mL). The resulting suspension was collected by vacuum filtration and washed with water. The solid was purified via silica gel chromatography (50-100% EtOAc/hexanes). Fractions containing product were combined, the solvent removed under reduced pressure to give the title compound (17.3 g, 50%): HPLC MS RT=1.05 min, MH+=192.1; 1H NMR (DMSO-d6) δ: 3.81 (3H, s), 3.90 (4H, s), 6.65 (1H, t), 6.86 (1H, dd), 7.03 (1H, dd).

1. customdegassed thoroughly
2. temperatureThe reaction was then cooled
3. concentrationconcentrated under reduced pressure
4. additiontreated with water (300 mL)
5. filtrationThe resulting suspension was collected by vacuum filtration
6. washwashed with water
7. customThe solid was purified via silica gel chromatography (50-100% EtOAc/hexanes)
8. additionFractions containing product
9. customthe solvent removed under reduced pressure