Acetic Acid → HCID 22388007, compound

Participants

Reaction Steps

Methyl 3-(2-chloro-4-nitrobenzyl)-2-methyl-3H-imidazo[4,5-b]pyridine-5-carboxylate (705 mg) was suspended in ethanol (6 ml), and reduced iron (437 mg) and acetic acid (1.01 ml) were added. The mixture was refluxed under heating for 2 hr. Then, reduced iron (218 mg) and acetic acid (1.01 ml) were further added, and the mixture was refluxed under heating for 1 hr. The reaction mixture was filtered through Celite, the insoluble matter was washed with ethanol and the filtrate was concentrated under reduced pressure. To the concentrate were added a saturated aqueous sodium hydrogencarbonate solution and ethyl acetate to make the aqueous layer alkaline. At this stage, part of the objective compound was precipitated. The precipitate was collected by filtration and the filtrate was partitioned. The organic layer was washed successively with a saturated aqueous sodium hydrogencarbonate solution and saturated brine, dried over anhydrous magnesium sulfate, and filtrated. The objective compound that precipitated during neutrlization was dissolved in a mixed solvent of methanol/chloroform (1/4), and the mixture was filtrated. Both filtrates were combined and concentrated under reduced pressure to give the objective compound (608 mg) as a white powder.

Provenance & Evidence