Triethylamine → 8-Chloro-1-(2,4-dichloro-6-methylphenyl)-2,3-dihydro imidazo[1,2-a]benzimidazole-5-carbaldehyde

Participants

Reaction Steps

To a solution of [8-chloro-1-(2,4-dichloro-6-methylphenyl)-2,3-dihydro-1H-imidazo[1,2-a]benzimidazol-5-yl]methanol (163 mg, 0.426 mmol) and triethylamine (0.48 mL, 3.44 mmol) in dimethylsulfoxide (5.0 mL) was added sulfur trioxide-pyridine complex (0.44 g, 2.76 mmol) at room temperature. The mixture was stirred at room temperature for 24 hr. Aqueous sodium hydrogen carbonate was added dropwise to the reaction mixture at room temperature. The precipitated solid was collected by filtration. The solid was washed with water, 2-propanol and diisopropyl ether to give the title compound (140.8 mg, 0.37 mmol, 87%) as a pale yellow solid.

Provenance & Evidence