反应详情

A mixture of 1-ethyl-6-chloro-7-(1-piperazinyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid 1.7 g (0.005 mole), anhydrous trifluoroacetic acid 4.2 g (0.02 mole) and dichloromethane 4 ml was stirred at room temperature for 3 hours. The reaction mixture was evaporated under vacuum and the residue was recrystallized from a mixed solvent of DMF and ethanol to obtain 1.8 g (86%) of 1-ethyl-6-chloro-7-(4-trifluoroacetyl-1-piperazinyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid. Colorless plates. Melting point: 297°-298° C. (decomposition).

1. customThe reaction mixture was evaporated under vacuum
2. customthe residue was recrystallized from a mixed solvent of DMF and ethanol