Sulfuric Acid → 1-[2-Methyl-1-(propan-2-yl)-1H-imidazol-5-yl]ethan-1-one

Participants

Reaction Conditions

Reaction Steps

In a 300 mL-volume glass vessel equipped with a stirrer, a thermometer and a dropping funnel, the isopropyl alcohol solution containing 16.2 g (0.162 mol) of N-isopropylacetamidine (which was prepared in the above-mentioned Reference Example 1), 22.8 g (0.108 mol) of 3-bromo-4,4-dimethoxy-2-butanone and 16.4 g (0.162 mol) of triethylamine were placed. The mixture was heated to 80° C. under stirring for 20 hours, for carrying out reaction. After the reaction was complete, 80 mL of sulfuric acid (2 mol/L) was added to the reaction mixture, and the mixture was concentrated under reduced pressure. The concentrate was washed with methyl isobutyl ketone, and the aqueous portion was taken out. The aqueous portion was made basic by adding an aqueous 48% sodium hydroxide, while the mixture was kept at a temperature of not higher than 40° C. The aqueous basic portion was subjected to extraction with methyl isobutyl ketone, and the extracted portion was concentrated under reduced pressure. The concentrate was distilled under reduced pressure (0.4 kPa, 85° C.) to give 9.63 g (yield: 54%) of 5-acetyl-1-isopropyl-2-methylimidazol as pale yellow liquid.

Provenance & Evidence