Dipropylamine → HCID 14390448, compound

Participants

Reaction Steps

A suspension of 5-chloro-2-(4-chlorophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acid (3.1 g, 0.00963 mole) and 1,1'-carbonyldiimidazole (1.56 g, 0.00963 mole) in tetrahydrofuran (100 ml) was refluxed for 3.25 hours under nitrogen, cooled to room temperature, a stream of nitrogen was bubbled through the solution for 0.75 hr then a solution of dipropylamine (2.92 g, 0.0289 mole) in tetrahydrofuran (4 ml) was added. The reaction mixture was refluxed overnight under nitrogen and evaporated under reduced pressure. The residue was partitioned between water and ethyl acetate, the layers were separated, sodium chloride was added to the aqueous layer and it was re-extracted with ethyl acetate. The combined organic layers were washed twice with a saturated sodium chloride solution, dried over magnesium sulfate, charcoaled, filtered and evaporated under reduced pressure to a solid (3.7 g, 95% yield). The solid was recrystallized from isopropyl alcohol/water and dried under high vacuum at 58° C. to give 2.11 g of title compound, mp 170°-173.5° C.

Provenance & Evidence