Ammonium Chloride → 3-Methyl-1-(3-methyl-1-benzofuran-2-yl)butan-1-one

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Reaction Steps

To a solution (20 mL) of N-methoxy-N,3-dimethyl-1-benzofuran-2-carboxamide (1.00 g) synthesized above in tetrahydrofuran was added dropwise a 1.0M solution (6.84 mL) of isobutylmagnesium bromide in tetrahydrofuran at 0° C., and the mixture was stirred for 1 hr. In addition, 1.0M isobutylmagnesium bromide tetrahydrofuran solution (6.84 mL) was added, and the mixture was stirred at 0° C. for 1 hr then at room temperature for 2 hr. Saturated aqueous ammonium chloride solution was added to quench the reaction, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=1:9, volume ratio) to give the title object compound (873 mg, 89%) as a colorless oil.

Provenance & Evidence