Hydrogen Bromide → 3-[4-(2-propenyl)-1-piperazinyl)-1-(4-fluorophenyl)-1H-indazole hydrobromide

Participants

Reaction Steps

A mixture of 5.0 g of 1-(4-fluorophenyl)-3-(1-piperazinyl)-1H-indazole, 2.6 g of potassium carbonate, 2.2 g of allyl bromide, and 75 ml of dimethylformamide was stirred at 70°-75° for 16 hours, and then at ambient temperature for 48 hours. The mixture was poured into water and the aqueous mixture was extracted with ethyl acetate. The extract was washed with water, dried over anhydrous magnesium sulfate and concentrated to produce an oil. The oil was dissolved in ethyl acetate and a saturated solution of hydrogen bromide in ethyl acetate was added, dropwise, until the solution was acidic. A precipitate was formed and collected. Recrystallization of the precipitate from ethanol gave 2.3 g (33%) of 3-[4-(2-propenyl)-1-piperazinyl)-1-(4-fluorophenyl)-1H-indazole hydrobromide.

Provenance & Evidence