Pyridine → Ethyl 1-cyclopropyl-6,8-difluoro-7-(3-methyl-3-hydroxy-1-azetidinyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate

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Reaction Steps

A mixture of 0.9 g (2.9 mmoles) of ethyl 1-cyclopropyl-6,7,8-trifluoro-1,4-dihydro-4-oxo-3-quinolinecarboxylate, 0.54 g (4.3 mmoles) of 3-hydroxy-3-methylazetidine hydrochloride, 1 g (10.8 mmoles) of triethylamine and 10 ml of pyridine is heated under reflux for 10 hours. The product is cooled, and diluted with water. Filtering and washing yields 0.95 g (89%) of ethyl 1-cyclopropyl-6,8-difluoro-7-(3-methyl-3-hydroxy-1-azetidinyl)-1,4-dihydro-4-oxo-3-quinolinecarboxylate which is then hydrolysed by heating a mixture of 0.38 g (1 mmole) of this ester with 1.5 ml of ethanol, and 8 ml of 0.5N sodium hydroxide under reflux for 3 hours. The mixture is cooled, filtered and acidified with acetic acid.

Provenance & Evidence