1-Methylpiperazine → 5,6-Dihydro-2-(4-methyl-1-piperazinyl)-4H-imidazo[4,5,1-ij]quinoline

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Reaction Steps

A solution of 2-chloro-5,6-dihydro-4H-imidazo[4,5,1-ij]quinoline (4.30 g) in 20 ml of N-methylpiperazine (18.06 g) was heated under reflux, under nitrogen, with stirring. After 30 mins, the solution was diluted with sodium bicarbonate solution (100 ml) and water (200 ml). The aqueous solution was extracted with chloroform. The organic phase was dried over anhydrous magnesium sulfate and concentrated. The residue was purified by high performance liquid chromatography (silica gel; methanol). The appropriate fractions were collected and evaporated. The residue was crystallized from ether-petroleum ether to give 4.0 g (70%) of product, mp 112°-113° C.

Provenance & Evidence