1-Phenylpiperazine → 5,6-Dihydro-2-(4-phenyl-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 (3.00 g) in 1-phenylpiperazine (10 ml) was stirred at 100° C., under nitrogen, for five hrs. The reaction mixture was quenched with saturated sodium bicarbonate solution (200 ml) and extracted with chloroform. The combined organic extracts were dried over anhydrous magnesium sulfate, filtered, and the filtrate was concentrated. The residue was purified by high performance liquid chromatography (silica gel; 4:1 dichloromethane-ethyl acetate). The appropriate fractions were collected and evaporated. The residue was recrystallized from ethyl acetate to give 2.2 g (45%) of product, mp 168°-169° C.

Provenance & Evidence