Triethylamine → 2-(4-Chlorophenyl)-N-(cyclopropylmethyl)-3H-imidazo[4,5-b]pyridine-3-acetamide

Participants

Reaction Steps

Under nitrogen bubbling, a mixture of 2-(4-chlorphenyl)-3H-imidazo [4,5-b]pyridine-3-acetic acid (4.0 g, 0.014 mole) and 1,1'-carbonyldiimidazole (2.27 g, 0.014 mole) in 150 ml of tetrahydrofuran was stirred at room temperature for 4 hours. Aminomethylcyclopropane hydrochloride (3.01 g, 0.028 mole) and triethylamine (2.83 g, 0.028 mole) was added and the reaction mixture was allowed to stir at room temperature overnight. The tetrahydrofuran was evaporated to dryness and the residue was treated with water. The solid was collected by filtration, washed with water, and dried under high vacuum overnight. The solid was recrystallized from isopropyl alcohol with cooling. The crystalline precipitate was collected by filtration, washed with cold isopropyl alcohol and water, and dried under high vacuum at 60° C. overnight to give 3.92 g (82%) of crystals, mp 228°-229° C.

Provenance & Evidence