2,4-Dichloroaniline → Ethyl [4-chloro-2-[(2,4-dichlorophenyl)amino]-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]acetate

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl [2,4-dichloro-7-(1-ethylpropyl)-1H-benzimidazol-1-yl]acetate (708 mg, 2.06 mmol), 2,4-dichloroaniline (1.00 g, 6.19 mmol) and N-methyl-2-pyrrolidinone (0.5 mL) was stirred at 100° C. for 3.5 days. After cooling, the reaction mixture was neutralized with saturated aqueous sodium hydrogen carbonate and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by basic silica gel column chromatography eluting with a 3-15% ethyl acetate/n-hexane gradient mixture. The resulting solid was washed with n-hexane to give the title compound (115 mg, 0.245 mmol, 12%) as a colorless solid.

Provenance & Evidence