反应详情

Methyl 2-chloro-4-(4-chlorophenyl)-5-oxazolepropionate (1.50 g) and 2-propylimidazole (0.66 g) were dissolved in N,N-dimethylformamide (10 ml), and sodium hydride (60% dispersion in oil, 0.30 g) was gradually added to the resulting solution at room temperature. After this was stirred at room temperature for 3.5 hours, an aqueous solution of 2 N sodium hydroxide (50 ml) was added thereto and stirred for an additional 30 minutes. Water was added to the reaction mixture, and the pH was then adjusted to 6 with 2 N hydrochloric acid. The crystals thus precipitated were collected by filtration, and recrystallized from ethanol to obtain 4-(4-chlorophenyl)-2-(2-propyl-1-imidazolyl)-5-oxazolepropionic acid (1.25 g, 69%) as pale brown needles. mp 174-175° C.

1. stirringstirred for an additional 30 minutes
2. customThe crystals thus precipitated
3. filtrationwere collected by filtration
4. customrecrystallized from ethanol