反应详情

温度

80 °C

To a round-bottom flask, which was purged and maintained with an inert atmosphere of nitrogen, was added a solution of methyl 5-carbamimidoyl-4-cyclobutyl-2-methylbenzoate hydrochloride (compound 245.1, 350 mg, 1.11 mmol, 1.00 equiv, 90%) in ACN (50 mL). 1-Bromobutan-2-one (186 mg, 1.23 mmol, 1.00 equiv) and potassium carbonate (513 mg, 3.53 mmol, 3.00 equiv, 95%) were added to the reaction. The resulting solution was stirred overnight at 80° C. After cooling to ambient temperature, the mixture was diluted with ethyl acetate and washed with 3×30 mL of brine, dried over anhydrous sodium sulfate, and concentrated in vacuo. The residue was purified using silica gel column chromatography with ethyl acetate/petroleum ether (1:5) as eluent to furnish 290 mg (83%) of methyl 4-cyclobutyl-5-(5-ethyl-1H-imidazol-2-yl)-2-methylbenzoate as a yellow solid.

1. customTo a round-bottom flask, which was purged
2. temperaturemaintained with an inert atmosphere of nitrogen
3. temperatureAfter cooling to ambient temperature
4. washwashed with 3×30 mL of brine
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated in vacuo
7. customThe residue was purified