反应详情

A stirred mixture of 4.0 g of 3-(1-piperazinyl)-1-[4-(trifluoromethyl)phenyl]-1H-indazole hydrochloride, 2.4 g of (2-bromoethyl)benzene, 1.8 g of potassium carbonate and 60 ml of dimethylformamide was heated, under nitrogen, at 70°-75° for 8 hours, and then stirred at ambient temperature for 8 hours. The reaction mixture was poured into water, and the aqueous mixture extracted with ethyl acetate. The extract was washed with water, dried over anhydrous magnesium sulfate and concentrated to an oil. The oil was chromatographed on a Water's Model High Pressure Liquid Chromatograph utilizing silica columns and eluting with hexane/ethyl acetate (30%). Concentration of the appropriate fractions gave 4.3 g of 3-[4-(2-phenylethyl)-1-piperazinyl]-1-[4-(trifluoromethyl)phenyl]-1H-indazole. The free base was dissolved in diethyl ether and treated with hydrogen chloride to precipitate the corresponding hydrochloride salt. Recrystallization from ethanol/diethyl ether gave 3.1 g of 3-[4-(2-phenylethyl)-1-piperazinyl]-1-[ 4-(trifluoromethyl) phenyl]-1H-indazole hydrochloride, mp 255°-257°.

1. temperaturewas heated, under nitrogen, at 70°-75° for 8 hours
2. extractionthe aqueous mixture extracted with ethyl acetate
3. washThe extract was washed with water
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated to an oil
6. customThe oil was chromatographed on a Water's Model High Pressure Liquid Chromatograph
7. washeluting with hexane/ethyl acetate (30%)