Dimethylformamide → HCID 15117093, compound

Participants

Reaction Steps

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°.

Provenance & Evidence