反应详情

6-Bromo-1-ethenyl-2-methoxynaphthalene (1.20 g) was dissolved in THF (12 ml). To the solution was added dropwise a solution of n-butyllithium in hexane (1.6M: 3.4 ml) at −70° C., and the mixture was stirred for 30 min. A solution of 1-(1H-imidazol-4-yl)-2-methyl-1-propanone (1.73 g) in THF (10 ml) was stirred for 40 min, and the temperature of the mixture was elevated to room temperature. To the reaction mixture were added an aqueous solution of ammonium chloride (10 ml) and water (10 ml), and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated sodium chloride solution, dried and concentrated. The residue was crystallized from ethyl acetate to give the titled compound (1.28 g) as a colorless powder. Mother liquor was purified by silica gel column chromatography (eluent, hexane-ethyl acetate=1:1) followed by recrystallization from ethyl acetate-diisopropyl ether to give the titled compound (0.23 g).

1. customwas elevated to room temperature
2. extractionthe mixture was extracted with ethyl acetate
3. washThe organic layer was washed with saturated sodium chloride solution
4. customdried
5. concentrationconcentrated
6. customThe residue was crystallized from ethyl acetate