Triethylamine → 8-Chloro-1-(2,4-dichlorophenyl)-5-(1-ethylpropyl)-1H-imidazo[1,2-a]benzimidazol-2(3H)-one

Participants

Reaction Steps

To a suspension of {4-chloro-2-[(2,4-dichlorophenyl)amino]-7-(1-ethylpropyl)-1H-benzimidazol-1-yl}acetic acid (Reference Example 21; 294 mg, 0.667 mmol) in N,N-dimethylformamide (3 mL) were added triethylamine (0.11 mL, 0.800 mmol) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (153 mg, 0.800 mmol), and the mixture was stirred at room temperature for 15 hr. The reaction mixture was diluted with water, and the suspension was stirred at room temperature for 1.5 hr. The resulting solid was collected by filtration and washed with water. The crystal was recrystallized from diisopropyl ether-n-hexane to give 160 mg (0.378 mmol, 57%) as a colorless crystal.

Provenance & Evidence