反应详情

To a solution of 3-bromo-4′-fluoro-1,1′-biphenyl (1.50 g) in THF (20 ml) was added dropwise a solution (1.6 M; 3.73 ml) of n-butyllithium in hexane at −78° C., and the mixture was stirred for 20 min. A solution of 1-(1-trityl-1H-imidazol-4-yl)-1-ethanone (1.91 g) in THF (25 ml) was added dropwise at −78° C., and the mixture was stirred at −78° C. for 1 h, at −35 to −10° C. for 1 h and at 0° C. for 1 h. Saturated aqueous ammonium chloride solution was added to the reaction mixture and the mixture was extracted with ethyl acetate, washed with saturated brine and dried. The solvent was evaporated under reduced pressure and the residue was purified by column chomatography (eluent, hexane:ethyl acetate=3:1→1:1) and recrystallized from ethyl acetate-hexane to give the title compound (1.57 g) as colorless prism crystals.

1. stirringthe mixture was stirred at −78° C. for 1 h, at −35 to −10° C. for 1 h and at 0° C. for 1 h
2. extractionthe mixture was extracted with ethyl acetate
3. washwashed with saturated brine
4. customdried
5. customThe solvent was evaporated under reduced pressure
6. customthe residue was purified by column chomatography (eluent, hexane:ethyl acetate=3:1→1:1)
7. customrecrystallized from ethyl acetate-hexane