Triethylamine → Phthalimide

Participants

Reaction Conditions

Reaction Steps

4-Methylimidazole (5.0 g) and N-(4-bromobutyl)phthalimide (17.2 g) were dissolved in dimethylformamide (250 ml), triethylamine (25.5 ml) was added to the solution, and the resulting mixture was stirred at 120° C. for 3 hours. The reaction mixture was left to cool to room temperature, then ethyl acetate and distilled water were added to the reaction mixture, and the layers were separated. The organic layer was washed with distilled water, dried over anhydrous magnesium sulfate, and filtered. The filtrate was concentrated under reduced pressure, and the resulting residue was dissolved in ethyl acetate. The reaction mixture was stirred, the deposited solid was removed by filtration, and the resulting filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (ethyl acetate:methanol=20:1). A mixed solution of ethyl acetate and hexane was added to the resulting roughly purified product, and the resulting mixture was stirred with heating to dissolve the roughly purified product, and then gradually cooled to room temperature to deposit a solid. The deposited solid was collected by filtration to obtain a phthalimide compound (324 mg). (2) By using the compound obtained in (1) mentioned above (324 mg) as a starting material, the title compound (183 mg) was obtained in the same manner as that of Reference Example 9, (2).

Provenance & Evidence