HCID 20463284, compound → HCID 20463331, compound

Participants

Reaction Steps

2.1 g of 5-methyl-4-(2'-methylbenzoyl)imidazole are dissolved in 10 ml of acetic acid. 0.2 g of 10% palladium-on-carbon is added and the reaction mixture is agitated vigorously at about 60° C. in a hydrogen atmosphere until the uptake of hydrogen ceases. The mixture is then cooled and filtered and the filtrate is evaporated to dryness. The residue is dissolved in 20 ml of water and the resultant solution is made alkaline (pH about 10) with sodium hydroxide. The precipitate which forms is removed by filtration, washed with water and dried. The product is transformed to the hydrochloride in isopropanol, its melting point after recrystallization from water-ethanol being 226°-268° C. The free base, 5-methyl-4-(2'-methylbenzyl)imidazole, which is liberated from the hydrochloride in water with sodium hydroxide, has a melting point of 138°-140° C.

Provenance & Evidence