反应详情

温度

185 °C

A finely ground mixture of 2-(3,4-diaminobenzyl)isoindole-1,3-dione (2.0 g, 7.5 mmol) and 2-ethoxycarbonylmethyl-1H-benzimidazole-5-carboxylic acid (0.93 g, 3.75 mmol) was heated 1 hour at 185° C. under nitrogen. The mixture was suspended in 1:1 methylene chloride/ethanol (20 mL) and stirred vigorously for 1 hour. The solids were collected by filtration, washed with 1:1 methylene chloride/ethanol (3×20 mL) and dried to provide 2-[5-(1,3-dioxo-1,3-dihydroisoindol-2-ylmethyl)-1H-benzoimidazol-2-ylmethyl]-1H-benzoimidazole-5-carboxylic acid (0.98 g, 29% yield); 1H-NMR (300 Mhz, DMSO-d6): 12.45 (broad s, 1H), 8.07 (s, 1H), 7.80-7.83 (m, 6H), 7.51 (d, 1H, J=7.5 Hz), 7.43 (s, 1H), 7.11 (d, 1H, J=7.2 Hz), 4.82 (s, 2H), 4.48 (s, 2H).

1. filtrationThe solids were collected by filtration
2. washwashed with 1:1 methylene chloride/ethanol (3×20 mL)
3. customdried