反应详情

To a solution of 1H-imidazole-1-ylacetic acid (284 mg, 2.25 mmol) and 2-nitrobenzene-1,4-diamine (324 mg, 2.12 mmol) in acetonitrile (20 mL) was added 3-diethoxyphosphoryloxy-1,2,3-benzotriazin-4(3H)-one (DEPBT, 632 mg, 2.11 mmol) and triethylamine (600 μL, 4.4 mmol). The mixture was stirred for 4 d at room temperature. The red precipitate was collected by filtration and washed with acetonitrile to give N-(4-amino-3-nitrophenyl)-2-(1H-imidazol-1-yl)acetamide (430 mg, 88% yield), 98% pure. A solution of N-(4-amino-3-nitrophenyl)-2-(1H-imidazol-1-yl)acetamide (430 mg, 1.65 mmol) in ethanol (20 mL) was hydrogenated at atmospheric pressure with 10% palladium on carbon (100 mg, 0.09 mmol) at room temperature overnight. The mixture was filtered, giving a blue solution. Removal of the solvent under reduced pressure gave N-(3,4-diaminophenyl)-2-(1H-imidazol-1-yl)acetamide (413 mg) as a blue semi-solid.

1. filtrationThe red precipitate was collected by filtration
2. washwashed with acetonitrile