反应详情

2.1 g (10 mmol) of 1-cinnamyl-piperazine and 2.2 g of 1,4-diazabicyclo[2.2.2]octane are added to 2.8 g (10 mmol) of 7-chloro-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid in 35 ml of dimethyl sulphoxide, and the mixture is heated at 140° for 5 hours. It is concentrated under a high vacuum, the residue is stirred with 50 ml of water and the pH is brought to 6 with 2N hydrochloric acid. The precipitate which has separated out is filtered off with suction, washed with water and boiled up with methanol. 1.7 g of 7-(4-cinnamyl-1-piperazinyl)-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid of melting point 230°-234° (with decomposition) are obtained.

1. temperaturethe mixture is heated at 140° for 5 hours
2. concentrationIt is concentrated under a high vacuum
3. customThe precipitate which has separated out
4. filtrationis filtered off with suction
5. washwashed with water