反应详情

温度

140 °C

To 3-amino-4-[2-(1H-indazol-3-yl)vinyl]benzoic acid (1.7 g, 6.2 mmol) obtained in Step 2 of Example 276, xylene (55 mL), triethylamine (0.45 mL, 3.1 mmol), 3-nitrophthalic anhydride (1.4 g, 7.4 mmol), molecular sieves 3A (2.0 g) were added, followed by heating at 140° C. for 4 hours. Molecular sieves 3A was filtered off and the reaction mixture was acidified by hydrochloric acid (2 mol/L). The precipitated crystal was collected by filtration to obtain (E)-4-[2-(1H-indazol-3-yl)vinyl]-3-(4-nitro-1,3-dioxo-1,3-dihydroisoindol-2-yl)benzoic acid.

1. filtrationMolecular sieves 3A was filtered off
2. filtrationThe precipitated crystal was collected by filtration