反应详情

3.3 g (10 mmol) of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinolinecarboxylic acid are heated at 90° in 50 ml of dimethylformamide with 1.8 g (20 mmol) of chloromethylcyclopropane, 3.3 g (20 mmol) of potassium iodide and 2.1 g of triethylamine for 5 hours. The solution is poured into 40 ml of water, the pH is brought to 5 with 2N hydrochloric acid and the precipitate is filtered off with suction and recrystallized from methanol. 0.6 g of 1-cyclopropyl-7-(4-cyclopropylmethyl-1-piperazinyl)-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid of melting point 279°-282° (with decomposition) is obtained.

1. filtrationthe precipitate is filtered off with suction
2. customrecrystallized from methanol