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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HRID 655022Generated: October 30, 2026

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

https://huagongshe.com/reaction/655022

Reaction equation

Participants

RoleNameHCIDCharge
ReactantHydrogen BromideHCID 260—
ReactantAllyl bromideHCID 7841—
ReactantPotassium CarbonateHCID 11430—
Reactant1-(4-fluorophenyl)-3-(1-piperazinyl)-1H-indazoleHCID 15117082—
SolventWaterHCID 962—
SolventDimethylformamideHCID 6228—
SolventEthyl AcetateHCID 8857—
Product3-[4-(2-propenyl)-1-piperazinyl)-1-(4-fluorophenyl)-1H-indazole hydrobromideHCID 1988707933%

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

DOI10.6084/m9.figshare.5104873.v1
Patent numberUS05134236
Source datasetuspto-grants-1992_07
ORD IDord-d59ea7eb8a8f46e684df7607f30ad587
Source noteuspto-grants-1992_07