1-(2-Methoxyphenyl)piperazine → HCID 21473365, compound

Participants

Reaction Steps

In 40 ml of ethanol was dissolved 0.81 g (0.0042 mole) of 1-(2-methoxyphenyl)piperazine, and to the solution was added gradually 1.02 g (0.0028 mole) of ethyl 7-chloro-6-fluoro-1-(4-fluorophenyl)-1,4-dihydro-4-oxo-1,8-naphthyridine-3carboxylate at 30° C. while stirring. After completion of the addition, the mixture was reacted at the same temperature for 4 hours. After the reaction mixture was cooled, crystals precipitated were collected by filtration and washed with ethanol. To the crystals were added 12 ml of a 6N hydrochloric acid aqueous solution, and the mixture was refluxed by heating for 6 hours. After cooling, the reaction mixture was adjusted to pH 8.5 with a 1N sodium hydroxide aqueous solution, and crystals precipitated were collected by filtration and applied to silica gel column chromatography (the eluent used was a mixture of chloroform:methanol=9.5:0.5) to obtain 0.87 g of the title compound as slightly yellow powder.

Provenance & Evidence