Water → 3-[4-(2-propenyl)-1-piperazinyl]-1-phenyl-1H-indazole

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of 5.0 g of 1-phenyl-3-(1-piperazinyl)-1H-indazole and 2.7 g of potassium carbonate in 50 ml of dimethylformamide was added 2.4 g of allyl bromide. The reaction mixture was stirred at 70° C. for 16 hours, poured into water and extracted with ethyl acetate. The extract was washed with water, dried over anhydrous magnesium sulfate, and concentrated to yield 3-[4-(2-propenyl)-1-piperazinyl]-1-phenyl-1H-indazole as an oil. The oil was diluted with diethyl ether and filtered. Treatment of the filtrate with ethereal hydrogen chloride precipitated the hydrochloride salt. Recrystallization from ethanol/diethyl ether gave 2.0 g (21%) of 3-[4-(2-propenyl)-1-piperazinyl]-1-phenyl-1H-indazole hydrochloride, mp 234°-236°.

Provenance & Evidence