反应详情

A solution of 1.1 g (4 mmoles) of 1-ethyl-6,7,8-trifluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, 1.32 g (6 mmoles) of 3-methyl-3-trifluoroacetamidoazetidine hydrochloride and 0.8 g (8 mmoles) of triethylamine in 10 ml of pyridine is heated under reflux for 3 hours. Cooling, filtering and washing with water acidified with a little acetic acid yields 0.65 g (37%) of 1-ethyl-6,8-difluoro-1,4-dihydro-4-oxo-7-(3-methyl-3-trifluoroacetamido-1-azetidinyl)-3-quinolinecarboxylic acid, melting at 196°-210° C.

1. temperatureunder reflux for 3 hours
2. temperatureCooling
3. filtrationfiltering
4. washwashing with water